NEET Biology Organisms and population Question Bank

done Self Evaluation Test - Organisms and Population Total Questions - 87

• question_answer1)
  Sequence of humification and mineralisation is:
  A)
  Dead organic matter \[\to \] Litter \[\to \] Duff \[\to \]Humus \[\to \] Minerals done clear
  B)
  Humus \[\to \] Minerals \[\to \] Litter \[\to \] Duff done clear
  C)
  Minerals \[\to \] Humus \[\to \] Litter \[\to \] Duff done clear
  D)
  Dead organic matter \[\to \] Duff \[\to \] Litter \[\to \]Minerals \[\to \] Humus done clear
  View Solution play_arrow

• question_answer2)
  Permafrost is the most distinctive feature of:
  A)
  Taiga done clear
  B)
  Temperate grasslands done clear
  C)
  Tundra done clear
  D)
  Pacific northwest done clear
  View Solution play_arrow

• question_answer3)
  Desert regions are characterised by ­____­____ centimeters of rainfall per year.
  A)
  less than 5       done clear
  B)
                     less than 15 done clear
  C)
  less than 25 done clear
  D)
                     over 50 done clear
  View Solution play_arrow

• question_answer4)
  For plants inhabiting a tropical rain forest, the critical competition, is for-   
  A)
  Soil nutrients    done clear
  B)
                     Water done clear
  C)
  Space                                        done clear
  D)
  Light done clear
  View Solution play_arrow

• question_answer5)
  Biome is:
  A)
  sum of ecosystems in a geographical area. done clear
  B)
  sum of ecosystems of the whole earth. done clear
  C)
  biotic component of an ecosystem. done clear
  D)
  biotic potential of a population. done clear
  View Solution play_arrow

• question_answer6)
  Which of the following communities is more vulnerable to invasion by outside animals and plants?
  A)
  Tropical evergreen forests done clear
  B)
  Oceanic island communities done clear
  C)
  Mangroves done clear
  D)
  Temperate forests done clear
  View Solution play_arrow

• question_answer7)
  The sun loving plants are referred to as:
  A)
  Halophytes      done clear
  B)
                     Heliophytes done clear
  C)
  Heterotrophs     done clear
  D)
                     Sciophytes done clear
  View Solution play_arrow

• question_answer8)
  What is best pH of soil for cultivation?
  A)
  3.4-5.4          done clear
  B)
                     4.5-5.5 done clear
  C)
  5.5-6.5        done clear
  D)
  5-7.5 done clear
  View Solution play_arrow

• question_answer9)
  Mechanical tissue is best developed in:
  A)
  Hydrophytes     done clear
  B)
                     Halophytes done clear
  C)
  Xerophytes  done clear
  D)
                     Mesophytes done clear
  View Solution play_arrow

• question_answer10)
  Adaptation to low temperature and freezing in animals occurs due to the production of-
  A)
  Antifreeze proteins                       done clear
  B)
  Chaperonins done clear
  C)
  Proline                                       done clear
  D)
  Analine done clear
  View Solution play_arrow

• question_answer11)
  Which of the following is not a reason why population growth declines as population size approaches the carrying capacity?
  A)
  Climate becomes unfavorable. done clear
  B)
  Competition for resources increases. done clear
  C)
  Predation rates increase. done clear
  D)
  Disease rates increase. done clear
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• question_answer12)
  Explosive growth in human population size can be attributed largely to:
  A)
  declining death rates due to improved medical care. done clear
  B)
  proliferation of fast-food outlets, leading to easier access to nutrients. done clear
  C)
  increasing birth rates due to better health and fertility. done clear
  D)
  declining death rates due to declining incidence of war. done clear
  View Solution play_arrow

• question_answer13)
  No population can grow indefinitely. The ultimate size of any population is limited by:
  A)
  the carrying capacity of its environment. done clear
  B)
  its birth rate. done clear
  C)
  its intrinsic growth rate. done clear
  D)
  reproductive isolation. done clear
  View Solution play_arrow

• question_answer14)
  In an equilibrium population (at its carrying capacity), thousands of eggs and hundreds of tadpoles are produced by a single pair of frogs. About how many offsprings will live to reproduce the next year? 
  A)
  0                                              done clear
  B)
  2 done clear
  C)
  10 to 20         done clear
  D)
                     More than 100 done clear
  View Solution play_arrow

• question_answer15)
  Which of the following statement is incorrect?
  A)
  Habitat includes both biotic and abiotic factors. done clear
  B)
  Abiotic and biotic components interact constantly with each other. done clear
  C)
  Abiotic components alone can characterize the habitat of an organism. done clear
  D)
  Major abiotic factors includes temperature, water, light and soil. done clear
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• question_answer16)
  For a population that is stable in size, the following age distribution indicates that:
  A)
  the population's birth and death rates are both high. done clear
  B)
  the population's birth and death rates are both low. done clear
  C)
  the population's birth rate is low but its death rate is high. done clear
  D)
  the population's birth rate is high but its death rate is low. done clear
  View Solution play_arrow

• question_answer17)
  Which statement does not reflect a reason why grasses predominate in savannah?
  A)
  There are few native herbivores in this biome. done clear
  B)
  Grasses grow well in fine, sandy soils. done clear
  C)
  The above ground portions of grass plants die during dry seasons. done clear
  D)
  The deep roots of the grasses can survive many months of drought. done clear
  View Solution play_arrow

• question_answer18)
  Competitive exclusion principle was put forward by G.F. Gause on the basis of experimental observation on:
  A)
  Chlorella        done clear
  B)
  Paramoecium done clear
  C)
  Microcystis      done clear
  D)
                     Cuckoo bird done clear
  View Solution play_arrow

• question_answer19)
  Which of the following type of interactions occur in predation and parasitism?
  A)
  (+, +)           done clear
  B)
                     (+, 0) done clear
  C)
  (+, -)           done clear
  D)
  (-, -) done clear
  View Solution play_arrow

• question_answer20)
  If b=65 and d = 45, N = 100 then find out \[\frac{dN}{dt.}\]
  A)
  2000           done clear
  B)
  1000 done clear
  C)
  200                                           done clear
  D)
  100 done clear
  View Solution play_arrow

• question_answer21)
  Organisms occupying similar ecological niche but different geographical areas of distribution are called as:
  A)
  Edge species done clear
  B)
  Ecological equivalents done clear
  C)
  Ecoclines done clear
  D)
  Inquilines done clear
  View Solution play_arrow

• question_answer22)
  In the models that describe population growth r stands for:
  A)
  population density done clear
  B)
  a time interval done clear
  C)
  total number of individuals in the population. done clear
  D)
  growth rate done clear
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• question_answer23)
  Human population growth ______.
  A)
  has an S-shaped curve.   done clear
  B)
  is currently in a logistic phase. done clear
  C)
  is currently exponential. done clear
  D)
  has reached carrying capacity. done clear
  View Solution play_arrow

• question_answer24)
  The maximum expansion rate of a population under the best conditions is referred to as ___. There are abundant resources that last forever and no limits on growth.
  A)
  biotic potential                            done clear
  B)
  cohort done clear
  C)
  mortality rate                             done clear
  D)
  biome done clear
  View Solution play_arrow

• question_answer25)
  Casuarina equisetifolia is a:
  A)
  Mesophytes     done clear
  B)
                     Xerophyte done clear
  C)
  Halophyte                                  done clear
  D)
  Forest epiphyte done clear
  View Solution play_arrow

• question_answer26)
  The chief advantage of encystment to Amoeba proteus is:    
  A)
  an ability to live for a time without ingesting food. done clear
  B)
  the cessation of most metabolic activity so that available energy may be used for reproduction. done clear
  C)
  the opportunity to get rid of accumulated waste products. done clear
  D)
  the ability to survive during unfavourable physical conditions. done clear
  View Solution play_arrow

• question_answer27)
  Photosynthetically Active Radiation (PAR) is:
  A)
  5% of incident solar radiation done clear
  B)
  50% of incident solar radiation done clear
  C)
  0.5% of incident solar radiation done clear
  D)
  99% of incident solar radiation done clear
  View Solution play_arrow

• question_answer28)
  In an age pyramid, the number of individuals of reproductive age is lesser than pre-reproductive but higher than post reproductive ones. The population is:
  A)
  Growing done clear
  B)
  Declining done clear
  C)
  Stable done clear
  D)
  Can not be predicted done clear
  View Solution play_arrow

• question_answer29)
  In biotic community, which of the following can be called protective device?
  A)
  Mimicry done clear
  B)
  Symbiosis done clear
  C)
  Competition                               done clear
  D)
  Parasitism done clear
  View Solution play_arrow

• question_answer30)
  Bell-shaped polygonal pyramid indicates:
  A)
  high percentage of young individuals. done clear
  B)
  moderate percentage of young individuals. done clear
  C)
  low percentage of young individuals. done clear
  D)
  low percentage of old individuals. done clear
  View Solution play_arrow

• question_answer31)
  Mark the correct identification from the following picture.       
  A)

  1	2	3
  Tropical forest	Temperate forest	Coniferous forest

    done clear
  B)

  Temperate forest

  Tropical forest

  Coniferous forest

    done clear
  C)

  Temperate forest

  Coniferous forest

  Tropical forest

    done clear
  D)

  Coniferous forest

  Tropical forest

  Temperate forest

    done clear
  View Solution play_arrow

• question_answer32)
  What does the shape of the given age pyramids (A to C) reflect about the growth status of populations?
  A)

  1	2	3
  Declining	Stable	Expanding

    done clear
  B)

  Stable

  Expanding

  Declining

    done clear
  C)

  Expanding

  Stable

  Declining

    done clear
  D)

  Declining

  Expanding

  Stable

    done clear
  View Solution play_arrow

• question_answer33)
  Which of the following statements) is/are incorrect?

  (i) Light is essential for life to exist on the earth.

  (ii) Many species of small plant under the canopy to tall trees in forest show optimal use of available light due to having large sized antenna and higher number of thylakoids.

  (iii) UV-rays is not harmful for many organisms. (iv) Photoperiodic requirement is not essential for many plant for flowering.

  (v) Red algae can live in deeper water of sea because of having pigment, phycoerythrin.

  A)
  Only (i)   done clear
  B)
                     Only (ii) done clear
  C)
  Only (iii)        done clear
  D)
                     (iv) and (v) done clear
  View Solution play_arrow

• question_answer34)
  The given, examples are associated with which type of adaptation?

  (i) Basking by desert lizards in sun.

  (ii) Hiding in burrows by some animals.

  (iii) Wearing of woollen clothes.

  (iv) Thermal gaping

  A)
  Scansorial adaptation done clear
  B)
  Cursorial adaptation done clear
  C)
  Biochemical adaptation done clear
  D)
  Behavioural adaptation done clear
  View Solution play_arrow

• question_answer35)
  Select the incorrect statement.
  A)
  Overwhelming majority of animals and nearly all plants maintain a constant internal temperature. done clear
  B)
  An orchid growing as an epiphyte on a mango branch is an example of commensalism. done clear
  C)
  In brood parasitism, the parasitic bird lays its eggs in the nest of its host and lets the host to incubate them. done clear
  D)
  In amensalism, one species is harmed whereas the other is unaffected. done clear
  View Solution play_arrow

• question_answer36)
  Which of the following statement(s) is/are incorrect?

  (i) Plants have no thermoregulation.

  (ii) 99% animals and almost all plants are conformers.

  (iii) Heat loss or heat gain is a function of surface area.

  (iv) Thermoregulation is energetically least expensive process for many organisms like shrews and humming birds.

  (v) 99% animals are thermoregulators.

  (vi) Archaebacteria cannot tolerate high temperature.

  A)
  (i) and (ii)       done clear
  B)
                     (iv), (v) and (vi) done clear
  C)
  None of these    done clear
  D)
                     All of these done clear
  View Solution play_arrow

• question_answer37)
  In commensalism:
  A)
  population of commensal and host remains unaffected. done clear
  B)
  population of commensal may increase while that of host remains unaffected. done clear
  C)
  population of both commensal and host increases. done clear
  D)
  population of commensal increases while the population of host gradually decreases. done clear
  View Solution play_arrow

• question_answer38)
  The relationship between hermit crab and sea anemone is:
  A)
  Symbiosis       done clear
  B)
                     Mutualism done clear
  C)
  Parasitism       done clear
  D)
                     Commensalism done clear
  View Solution play_arrow

• question_answer39)
  During succession, inhibition:
  A)
  may prevent the achievement of a climax community. done clear
  B)
  is evidence for the equilibrium theory of succession. done clear
  C)
  may interfere with the successful colonization of other species. done clear
  D)
  may involve changes in soil pH or accelerated accumulation of humus. done clear
  View Solution play_arrow

• question_answer40)
  A small, isolated population:  
  A)
  will do extremely well if protected. done clear
  B)
  is unlikely to survive, even within a reserve. done clear
  C)
  will grow, but extremely slowly. done clear
  D)
  will given the right conditions. done clear
  View Solution play_arrow

• question_answer41)
  In aquatic system, actively moving animal organisms are:
  A)
  Benthic                                      done clear
  B)
  Nektons done clear
  C)
  Zooplanktons    done clear
  D)
                     Phytoplanktons done clear
  View Solution play_arrow

• question_answer42)
  What is competitive exclusion?
  A)
  The evolution of traits that reduce niche overlap and competition. done clear
  B)
  Interactions that allow species to occupy their fundamental niche. done clear
  C)
  The degree to which the niches of two species overlap. done clear
  D)
  The claim that species with the same niche cannot coexist. done clear
  View Solution play_arrow

• question_answer43)
  The combination of conditions that a species will occupy in the absence of competitors is:
  A)
  The fundamental niche done clear
  B)
  The realised niche done clear
  C)
       Competitive exclusion done clear
  D)
  Mimicry done clear
  View Solution play_arrow

• question_answer44)
  Which part of the world has a high density of organisms?
  A)
  Grasslands                                 done clear
  B)
  Savannahs done clear
  C)
  Deciduous forests done clear
  D)
                     Tropical rain forests done clear
  View Solution play_arrow

• question_answer45)
  In which biome, 75-150 cm. annual rain fall takes place?
  A)
  Grassland done clear
  B)
  Mediterranean scrub forest done clear
  C)
  Deciduous forest done clear
  D)
  North coniferous forest done clear
  View Solution play_arrow

• question_answer46)
  A group of individuals of a plant inhabiting a particular area form a:
  A)
  Population  done clear
  B)
                     Community done clear
  C)
  Ecosystem      done clear
  D)
                     Species done clear
  View Solution play_arrow

• question_answer47)
  Sunken stomata can be seen in-
  A)
  Hydrilla                                     done clear
  B)
  Nymphaea done clear
  C)
  Acacia         done clear
  D)
  Rhizophora done clear
  View Solution play_arrow

• question_answer48)
  Refer to the graph below, which shows the changes in population size over time. Which part of this graph describes or refers to the exponential growth phase of a new population?
  A)
  1                                              done clear
  B)
  5 done clear
  C)
  2 done clear
  D)
  3 done clear
  View Solution play_arrow

• question_answer49)
  In laboratory experiments, two species of the protist Paramoecium were grown alone and in the presence of the other species. The following graphs show growth of species 1 (left) and species 2 (right), alone and when in mixed culture.             Interpretation of these graphs shows that:
  A)
  competitive exclusion occurred in the these experiments. done clear
  B)
  both species are affected by interspecific  competition but species 1 is less affected. done clear
  C)
  both species are affected by interspecific competition but species 2 is less affected. done clear
  D)
  both species are affected equally by interspecific competition. done clear
  View Solution play_arrow

• question_answer50)
  Heat loss or heat gain is a function of surface area. (i) Small animals in colder areas have large surface area.

  (ii) They expend less amount of energy and do not loose body heat.

  (iii) Small animals are rarely found in cold regions.

  Which of the above statements are correct regarding the function of surface area?

  A)
  Only (i)                                      done clear
  B)
  (ii) and (iii) done clear
  C)
  Only (iii)        done clear
  D)
                     (i) and (iii) done clear
  View Solution play_arrow

• question_answer51)
  Which statement explains the concept of Allen's rule?
  A)
  Aquatic mammals have blubber as insulator. done clear
  B)
  Mammals of colder climate have shorter ears and limbs. done clear
  C)
  Mammals of humid and warmer region have more melanin in their skin. done clear
  D)
  The bear undergoes hibernation during winter. done clear
  View Solution play_arrow

• question_answer52)
  Consider the following statements [A] - [D] each with one or two blanks.

  A. Lichens represent an intimate __(i)__ relationship between a fungus and __(ii)__.

  B.  The   __(iii)__   are   associations between fungi and the roots of higher plants.

  C.  Plants need the help of __(iv)__ for pollinating their flowers and dispersing their seeds.

  D. The __(v)__ pollinates the fig inflorescence while searching for suitable egg - laying sites.

  Which one of the following options, gives the correct fill ups for the respective blank numbers from (i) - (v) in the statements?

   
  A)
  (i) Parasitic; (ii) - Cyanobacteria; (iii)- Mycorrhizae; (iv) - Wind; (v) - Bee done clear
  B)
  (i) Mutualistic; (ii) - Cyanobacteria; (iii) - Mycorrhizae; (iv) - Animals; (v) Wasp done clear
  C)
  (i) Parasitic; (ii) - Cyanobacteria; (iii) - Mycorrhizae; (iv) - Insect; (v) Bumble bees done clear
  D)
  (i) Mutualistic; (ii) - Cyanobacteria; (iii) - Lichen; (iv) - Wind; (v) Wasp done clear
  View Solution play_arrow

• question_answer53)
  Match the column-I with column-II and choose the correct option.

  	Column-I		Column-II
  A.	Mutualism	I.	Tiger and deer
  B.	Commensalism	II.	Cuscuta on Cissus
  C.	Parasitism	III.	Sucker fish and shark
  D.	Predation	IV.	Crab and sea anemone

  A)
  A-I;     B-II;    C-III;    D-IV done clear
  B)
  A-III;   B-IV;   C-II;     D-I done clear
  C)
  A-II;     B-III;    C-I;     D-IV done clear
  D)
  A-IV;   B-II;     C-III;    D-I done clear
  View Solution play_arrow

• question_answer54)
  \[\frac{dN}{dt}=rN\left( \frac{K-N}{K} \right)\]

  A - Population density at time t.

  B - Intrinsic rate of nature increase.

  C - Carrying capacity.

  Identify A, B and C from given equation.

  A)

  A	B	C
  N	K	r

    done clear
  B)

  N

  r

  K

    done clear
  C)

  K

  N

  r

    done clear
  D)

  K

  r

  N

    done clear
  View Solution play_arrow

• question_answer55)
  During summer stratification, the upper layer of water is called:          
  A)
  Thermocline                               done clear
  B)
  Hypolimnion done clear
  C)
  Epilimnion      done clear
  D)
                     Ectolimnion done clear
  View Solution play_arrow

• question_answer56)
  Pneumatophores are special features of plants growing in:
  A)
  Dry and hot conditions done clear
  B)
  Water done clear
  C)
  Mangrove forests done clear
  D)
  Oligotrophic soils done clear
  View Solution play_arrow

• question_answer57)
  When birth rate equals death rate:
  A)
  a population grows rapidly. done clear
  B)
  the size of a population remains constant. done clear
  C)
  density-dependent limiting factors do not affect the population. done clear
  D)
  a population is in danger of extinction. done clear
  View Solution play_arrow

• question_answer58)
  At carrying capacity, a population ___.
  A)
  increases rapidly  done clear
  B)
        decreases slowly  done clear
  C)
          decreases rapidly done clear
  D)
  fluctuates around a median number done clear
  View Solution play_arrow

• question_answer59)
  The fresh leaves and recognisable litter are found in which of the following horizon of soil?
  A)
  A-horizon       done clear
  B)
                     B-horizon done clear
  C)
  C-horizon       done clear
  D)
                     0-horizon done clear
  View Solution play_arrow

• question_answer60)
  In Opuntia the spine is the modification of:
  A)
  Stem                                         done clear
  B)
  Root done clear
  C)
  Leaf            done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer61)
  Rainfall is absent but precipitation occurs in:
  A)
  Arctic desert     done clear
  B)
                     Tropical desert done clear
  C)
  Chaparral         done clear
  D)
                     Savannah done clear
  View Solution play_arrow

• question_answer62)
  Why are inducible defenses advantageous?
  A)
  They are always present - thus, an individual is always able to defend itself. done clear
  B)
  They make it impossible for a consumer to launch surprise attacks. done clear
  C)
  They result from a coevolutionary arms race. done clear
  D)
  They make efficient use of resources, because they are produced only when needed. done clear
  View Solution play_arrow

• question_answer63)
  Leaf cutter ants keep fungal gardens. The ants provide food for the fungus but also feed on the fungus. This is an example of
  A)
  Competition     done clear
  B)
                     Predation done clear
  C)
  Parasitism       done clear
  D)
                     Mutualism done clear
  View Solution play_arrow

• question_answer64)
  Which of the following statement is not correct about K-selection?
  A)
  Having long life span done clear
  B)
  Developed Interspecific competition done clear
  C)
  Very stable population done clear
  D)
  Having short generation time done clear
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• question_answer65)
  A population of 600 that experiences 65 births and 5 deaths during a one-year period. If the population maintains the current growth pattern, a plot of its growth would resemble:
  A)
  Exponential growth                     done clear
  B)
  Fluctuating growth     done clear
  C)
  K-selected growth                        done clear
  D)
  Logistic growth done clear
  View Solution play_arrow

• question_answer66)
  In the formula G = rN (K - N)/K, the factor rN tends to cause the population to ____.
  A)
  remain stable at the carrying capacity done clear
  B)
  grow at a slower rate than the (K - N/K) factor done clear
  C)
  grow increasingly rapidly done clear
  D)
  decrease in size done clear
  View Solution play_arrow

• question_answer67)
  Dense evergreen vegetation of broad sclerophyllous leaves and shrubs with fire resistant resinons plants is known as:
  A)
  Chaparral vegetation done clear
  B)
  Savannah vegetation done clear
  C)
  Steppe grassland done clear
  D)
  Tundra vegetation done clear
  View Solution play_arrow

• question_answer68)
  The shallow water zone around the edge of the lake is called:
  A)
  Littoral zone                               done clear
  B)
  Limnetic zone done clear
  C)
  Profundal zone done clear
  D)
                     Benthic zone done clear
  View Solution play_arrow

• question_answer69)
  Genetically adapted local population of a species (that has a wide range of distribution) are called:
  A)
  Phenotypes                                done clear
  B)
  Ecotype done clear
  C)
  Sciophytes                                 done clear
  D)
  Mesophytes done clear
  View Solution play_arrow

• question_answer70)
  Which one of the following is example of species that breed in captivity and produce infertile hybrids?
  A)
  Mallard (a duck) and the pin tail duck done clear
  B)
  Male donkey and female horse done clear
  C)
  Polar bear and the Alaskan brown bear done clear
  D)
  Platy and sword tail fishes done clear
  View Solution play_arrow

• question_answer71)
  Which one of the following is the interspecific hybrid variety?
  A)
  Mule                                         done clear
  B)
  Sugarcane done clear
  C)
  Pony                                         done clear
  D)
  All of these done clear
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• question_answer72)
  Which type of plants are found in Taiga Tundra?
  A)
  Halophytes      done clear
  B)
                     Xerophytes done clear
  C)
  Epiphytes       done clear
  D)
                     Psychrophytes done clear
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• question_answer73)
  Succulents occur in:
  A)
  Deserts done clear
  B)
  Tundra done clear
  C)
  Temperate deciduous forests done clear
  D)
  Tropical rain forests done clear
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• question_answer74)
  You are growing a bacterial population in a laboratory flask with a flow-through system that continuously replaces old culture medium with fresh medium without removing any bacteria. Which of the following graphs best predicts the growth of this population over time?
  A)
  A                                              done clear
  B)
  D done clear
  C)
  B                                              done clear
  D)
  C                                              done clear
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• question_answer75)
  Which of the following factors (given .below) determines the vegetation of any area?

  (i) pH of soil.

  (ii) Mineral compositon of the soil.

  (iii) Water holding capacity of soil.

  (iv) Precipitation.

  A)
  (i) and (ii)                                   done clear
  B)
  (ii) and (iii) done clear
  C)
  (i), (ii), and (iii) done clear
  D)
                     (i), (ii), (iii) and (iv) done clear
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• question_answer76)
  Match the column-I with column-II and choose the correct option.

  	Column-I		Column-II
  A.	Predation	I.	Cuscuta and Hedge plants
  B.	Commensalism	II.	Balanus and Chthamalus
  C.	Parasitism	III.	Cactus and Moth
  D.	Competition	IV.	Orchid and Mango

  A)
  A-III,     B-IV,    C-I,    D-II done clear
  B)
  A-IV,     B-III,    C-II,   D-I done clear
  C)
  A-I,        B-III,    C-II,   D-IV done clear
  D)
  A-III,     B-IV,    C-II,    D-I done clear
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• question_answer77)
  Plants have developed various means of protecting themselves from predators. One of the methods is by producing toxic chemicals. Identify such chemicals from the list given below.

  (i) Nicotine

  (ii) Caffeine

  (iii) Quinine

  (iv) Strychnine

  (v) Opium

  A)
  Only (i)                                      done clear
  B)
  (i), (ii), (iii) and (iv) done clear
  C)
  (i), (ii) and (iii)                            done clear
  D)
  All of the above done clear
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• question_answer78)
  Identify the incorrect statement.

  (i) Thermoregulation   energetically   least expensive process for many organisms like shrews and humming birds.

  (ii) 99% animals and nearly all plants cannot maintain their constant internal environment.

  (iii) During the course of evolution, the costs and heights of maintaining a constant internal environment are discarded.

  (iv) In aquatic animals, the osmotic concentration of the body fluids change with that of the ambient water osmotic concentration.

  A)
  (i) and (ii)                                   done clear
  B)
  (iii) and (iv) done clear
  C)
  (i) and (iii) done clear
  D)
  (ii) and (iii) done clear
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• question_answer79)
  Mark the correct statement.
  A)
  In case of bear, going into hibernation during winter, is an example of 'escape in time. done clear
  B)
  To prevent desiccation, some snails and fishes enter into diapause. done clear
  C)
  Under unfavourable conditions many zooplankton species go into aestivation. done clear
  D)
  All of the above done clear
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• question_answer80)
  Which of the following statement(s) is/are correct?

  (i) Organisms living in oceans, lakes and rivers do not face any water-related problems.

  (ii) Euryhaline can tolerate a wide range of salinities.

  (iii) Stenohaline are restricted to a narrow range of salinities.

  (iv) No fresh water animals cannot live for long in sea water but sea animals can live in fresh water for long time because of osmotic balance.

  (v) The salt concentration is less than 5% in inland water, 30-50% in sea and >100% in some hypersaline lagoons.

  A)
  All are correct except (i) done clear
  B)
  None of the above done clear
  C)
  Only (iv) done clear
  D)
  (i), (iii) and (iv) done clear
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• question_answer81)
  A country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations A and B twenty years apart. Select the correct interpretation about them.             
  A)
  "B" is earlier pyramid and shows stabilized growth rate. done clear
  B)
  "B" is more recent showing that population is very young. done clear
  C)
  "A" is the earlier pyramid and no change has occurred in the growth rate. done clear
  D)
  "A" is more recent and shows slight reduction in the growth rate. done clear
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• question_answer82)
  Study the population growth curves shown in the given diagram. Which options is the best for curve (1) and (2) ?
  A)

  Type of (1) curve	Type of (2) curve	Equation for curve(1)	Equation for curve(2)
  Logistic curve	Exponential curve	\[\frac{dN}{dt}=rN\]	\[\frac{dN}{dt}=rN\left( \frac{K-N}{K} \right)\]

    done clear
  B)

  Exponential curve

  Logistic curve

  \[\frac{dN}{dt}=rN\left( \frac{K-N}{K} \right)\]

  \[\frac{dN}{dt}=rN\]

    done clear
  C)

  Logistic curve

  Exponential curve

  \[\frac{dN}{dt}=rN\left( \frac{K-N}{K} \right)\]

  \[\frac{dN}{dt}=rN\]

    done clear
  D)

  Exponential curve

  Logistic curve

  \[\frac{dN}{dt}=rN\]

  \[\frac{dN}{dt}=rN\left( \frac{K-N}{K} \right)\]

    done clear
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• question_answer83)
  In the given graph arrow indicates specifically:              
  A)
  r done clear
  B)
  K-N done clear
  C)
  K done clear
  D)
  Density independent effect done clear
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• question_answer84)
  An oak tree produces thousands of acorns, but very few grow into mature oak trees. The oak tree exhibits a ___ survivorship curve.
  A)
  type I                                        done clear
  B)
  type II done clear
  C)
  type III         done clear
  D)
  type I or II done clear
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• question_answer85)
  Savannahs are:
  A)
  Tropical rain forests done clear
  B)
  Desert scrubs done clear
  C)
  Grassland with scattered trees done clear
  D)
  Dense forests with closed canopy done clear
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• question_answer86)
  Most molluscs and cry fishes are:
  A)
  Thermoconformers                      done clear
  B)
  Osmoconformers done clear
  C)
  Oxyregulators                             done clear
  D)
  All of the above done clear
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• question_answer87)
  Which of the following statements) is/are correct?

  (i) In a population growth rate curve, the lag phase represents the period when a population is adjusting to a new environment.

  (ii) In a population growth rate curve the steepest part of growth phase represents the period when a population is growing exponentially.

  (iii) In the stationary phase of a population growth rate curve, the population is in dynamic equilibrium.

  (iv) Humans have changed the carrying capacity of the earth.

  A)
  All of these done clear
  B)
  (i), (ii) and (iii) done clear
  C)
  (ii) and (iii)                                 done clear
  D)
  (i) and (iv) done clear
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