done 11th Biology Transportation in animals plants

• question_answer1)
  What are the factors affecting the rate of diffusion?
  View Answer play_arrow

• question_answer2)
  What are porins? What role do they play in diffusion? 
  View Answer play_arrow

• question_answer3)
  Describe the role played by protein pumps during active transport in plants. 
  View Answer play_arrow

• question_answer4)
  Explain why pure water has the maximum water potential. 
  View Answer play_arrow

• question_answer5)
  Differentiate between the following (a) Diffusion and osmosis (b) Transpiration and evaporation (c) Osmotic pressure and osmotic potential (d) Imbibition and diffusion (e) Apoplast and symplast pathways of movement of water in plants (f) Guttation and transpiration  
  View Answer play_arrow

• question_answer6)
  Briefly describe water potential. What are the factors affecting it? 
  View Answer play_arrow

• question_answer7)
  What happens when a pressure greater than the atmospheric pressure is applied to pure water or a solution? 
  View Answer play_arrow

• question_answer8)
  (a) With the help of well-labelled diagrams, describe the process of plasmolysis in plants, giving appropriate examples. (b) Explain what will happen to a plant cell if it is kept in a solution having higher water potential.  
  View Answer play_arrow

• question_answer9)
  How is the mycorrhizal association helpful in absorption of water and minerals in plants? 
  View Answer play_arrow

• question_answer10)
  What role does root pressure play in water movement in plants? 
  View Answer play_arrow

• question_answer11)
  Describe transpiration pull model of water transport in plants. What are the factors influencing transpiration? How is it useful to plants?
  View Answer play_arrow

• question_answer12)
  Discuss the factors responsible for ascent of xylem sap in plants.  
  View Answer play_arrow

• question_answer13)
  What essential role does the root endodennis play during mineral absorption in plants? 
  View Answer play_arrow

• question_answer14)
  Explain why xylem transport is unidirectional and phloem transport bi-directional? 
  View Answer play_arrow

• question_answer15)
  Explain pressure flow hypothesis of translocation of sugars in plants. 
  View Answer play_arrow

• question_answer16)
  What causes the opening and dosing of guard cells of stomata during transpiration? 
  View Answer play_arrow

• question_answer17) Which of the following statements does not apply to reverse osmosis? (a)It is used for water purification (b) In this technique, pressure greater than osmotic pressure is applied to the system (c) It is a passive process                                               (d) It is an active process

  View Answer play_arrow

• question_answer18) Which one of the following will not directly affect transpiration? (a) Temperature              (b) Light                                (c) Wind speed                 (d) Chlorophyll content of leaves

  View Answer play_arrow

• question_answer19) The lower surface of leaf will have more number of stomata in a   (a) dorsiventral leaf        (b) isobilateral leaf           (c) Both (a) and (b)            (d) None of these

  View Answer play_arrow

• question_answer20) The form of sugar transported through phloem is (a) glucose                          (b) fructose                        (c) sucrose                          (d) ribose

  View Answer play_arrow

• question_answer21) The process of guttation takes place (a) when the root pressure is high and the rate of transpiration is low. (b) when the root pressure is low and the rate of transpiration is high. (c) when the root pressure equals the rate of transpiration. (d) when the root pressure as well as rate of transpiration are high.

  View Answer play_arrow

• question_answer22) Which of the following is an example of imbibition? (a) Uptake of water by root hair                                (b) Exchange of gases in stomata (c) Swelling of seed when put in soil                        (d) Opening of stomata

  View Answer play_arrow

• question_answer23) When a plant undergoes senescence, the nutrients may be (a) accumulated                     (b) bound to cell wall                (c) translocated         (d) None of these

  View Answer play_arrow

• question_answer24) Water potential of pure water at standard temperature is equal to (a) 10                                     (b) 20                                    (c)zero                                  (d) None of these

  View Answer play_arrow

• question_answer25) Choose the correct option mycorrhiza is a symbiotic association of fungus with root system which helps in A. absorption of water    B. mineral nutrition       C. translocation                  D. gaseous exchange Codes (a) Only A        (b) Only B        (c) Both A and B   (d) Both B and C

  View Answer play_arrow

• question_answer26) Based on the figure given below which of the following statements is not correct? (a) Movement of solvent molecules will take place from chamber A to B (b) Movement of solute will take place from A to B (c) Presence of a semipermeable is a pre-requisite for this process to occur (d) The direction and rate of osmosis depends on both the pressure gradient andconcentration gradient

  View Answer play_arrow

• question_answer27) Match the followings and choose the correct option.

  Column I		Column II
  A.	Leaves	(i)	Anti-transpirant
  B.	Seed	(ii)	Transpiration
  C.	Roots	(iii)	Negative osmotic potential
  D.	Aspirin	(iv)	Imbibition
  E.	Plasmolysed dell	(v)	Absorption

  Codes (a) A-ii, B-iv, C-v, D-i, E-iii                                              (b) A-iii, B-ii, C-iv, D-i, E-v (c) A-i, B-ii, C-iii, D-iv, E-v                                               (d) A-v, B-iv, C-iii, D-ii, E-i

  View Answer play_arrow

• question_answer28) Mark the mismatched pair.

  Column I		Column II
  A.	Amyloplast	(i)	Store protein granule
  B.	Elaioplast	(ii)	Store oils or fats
  C.	Chloroplasts	(iii)	Contain chlorophyll pigments
  D.	Chromoplasts	(iv)	Contain coloured pigments other than chlorophyll

  View Answer play_arrow

• question_answer29) Smaller, lipid soluble molecules diffuse faster through cell membrane, but the movement of hydrophilic substances are facilitated by certain transporters which are chemically .........

  View Answer play_arrow

• question_answer30) In a passive transport across a membrane. When two protein molecules move in opposite direction and independent of each other, it is called as

  View Answer play_arrow

• question_answer31) 0smosis is a special kind of diffusion, in which water diffuses across the cell membrane. The rate and direction of osmosis depends upon both ?

  View Answer play_arrow

• question_answer32) A flowering plant is planted in an earthen pot and irrigated. Urea is added to make the plant grow faster, but after sometime the plant dies. This may be due to......... .  

  View Answer play_arrow

• question_answer33) Absorption of water from soil by dry seeds increases the ......... , thus helping seedlings to come out of soil.

  View Answer play_arrow

• question_answer34) Water moves up against gravity and even for a tree of 20 m height, the tip receives water within two hours. The most important physiological phenomenon which is responsible for the upward movement of water is?

  View Answer play_arrow

• question_answer35)   The plant cell cytoplasm is surrounded by both cell wall and cell membrane. The specificity of transport of substances are mostly across the cell membrane, because......... .

  View Answer play_arrow

• question_answer36) The plants are twice as efficient as  plants in terms of fixing  but lose only ...... as much water  plants for the same amount of fixed.

  View Answer play_arrow

• question_answer37) Movement of substances in xylem is unidirectional while in phloem it is bidirectional. Explain

  View Answer play_arrow

• question_answer38)   Indentify the process occurring in I, II and III    

  View Answer play_arrow

• question_answer39) Given below is a table. Fill in the gaps.

  Property	Simple Diffusion	Facilitated Transport	Active Transport
  Highly selective	No	Yes	-
  Uphill transport	-	-	Yes
  Requires ATP	-	-	-

  View Answer play_arrow

• question_answer40) Define water potential and solute potential.        

  View Answer play_arrow

• question_answer41) Why is solute potential always negative? Explain  

  View Answer play_arrow

• question_answer42) An onion peel was taken and (a) placed in salt solution for five minutes.           (b) after that it was placed in distilled water. When seen under the microscope what would be observed in (a) and (b)?

  View Answer play_arrow

• question_answer43) Differentiate between apoplast and symplast pathways of water movement. Which of these would need active transport?

  View Answer play_arrow

• question_answer44) How does most of the water moves within the root?

  View Answer play_arrow

• question_answer45) Give the location of casparian strip and explain its role in the water movement.

  View Answer play_arrow

• question_answer46) Differentiate between guttation and transpiration.

  View Answer play_arrow

• question_answer47)   Transpiration is a necessary evil in plants. Explain

  View Answer play_arrow

• question_answer48) Describe briefly the three physical properties of water which helps in ascent of water in xylem.

  View Answer play_arrow

• question_answer49) A gardener forgot to water a potted plant for a day during summer, what will happen to the plant? Do you think it is reversible? If yes, how?

  View Answer play_arrow

• question_answer50) Identify a type of molecular movement which is highly selective and requires special membrane proteins, but does not require energy.  

  View Answer play_arrow

• question_answer51) Correct the statements. (a) Cells shrink in hypotonic solutions and swell in hyper-tonic solutions. (b) Imbibition is a special type of diffusion when water is absorbed byliving cells. (c) Most of the water flow in the roots occurs via the symplast.

  View Answer play_arrow

• question_answer52) Minerals absorbed by the roots travel up the xylem. How do they reach the parts where they are needed most? Do all the parts of the plant get the same amount of the minerals?

  View Answer play_arrow

• question_answer53) If one wants to find minerals and in the form they are mobilised in the plant, how will an analysis of the exudate help?

  View Answer play_arrow

• question_answer54)   From your knowledge of physiology can you think of some method of increasing the life of cut plants in a vase?

  View Answer play_arrow

• question_answer55) Do different species of plant a growing in the same area show the same rate of transpiration at a particular time? Justify your answer.

  View Answer play_arrow

• question_answer56)   Water is indispensable for life. What properties of water make it useful for all biological processes on the earth?

  View Answer play_arrow

• question_answer57) How is if that the intra cellular levels ofK+ are higher than extracellular levels in animal cells?

  View Answer play_arrow

• question_answer58)  Cut pieces of beetroot do not leave the colour in cold water but do so in hot water. Explain.

  View Answer play_arrow

• question_answer59)   In a girdled plant, when water is supplied to the leaves ab.ove the girdle, leaves may remain green for sometime then wilt and ultimately die. What does it indicate?

  View Answer play_arrow

• question_answer60) Various types of transport mechanisms are needed to fulfill the mineral requirements of a plant. Why are they not fulfilled by diffusion alone?

  View Answer play_arrow

• question_answer61)   How can plants be grown under limited water supply without compromising on metabolic activities?

  View Answer play_arrow

• question_answer62) Will the ascent of sap be possible without the cohesion and adhesion of the water molecules? Explain.

  View Answer play_arrow

• question_answer63)   Keep some freshly cut flowers in a solution of food colour. Wait for sometime for the days to rise in the flower, when the stem, of the flower is held up in light, coloured strands can be seen inside. Can this experiment demonstrate which tissue is conducting water up the stem?

  View Answer play_arrow

• question_answer64) When a freshly collected Spirogyra filament is kept in a 10% potassium nitrate solution, it is observed that the protoplasm shrinks in size (a) What is this phenomenon called? (b) What will happen if the filament is replaced in distilled water?

  View Answer play_arrow

• question_answer65) Sugar crystals do not dissolve easily in ice cold water. Explain.

  View Answer play_arrow

• question_answer66) Salt is applied to tennis lawns to kill weeds. How does salting tennis lawns help in killing of weeds without affecting the grass?

  View Answer play_arrow

• question_answer67)   What is the chemical composition of xylem and phloem sap?

  View Answer play_arrow

• question_answer68) If you are provided with two tubes {A and B}, where one is narrow and the other is relatively wider and if both are immersed in a beaker containing water as shown in the figure. Why does B show higher water rise than A?

  View Answer play_arrow

• question_answer69) What are "aquaporins? How does presence of aquaporins affect osmosis:

  View Answer play_arrow

• question_answer70) ABA (Abscisic Acid) is called a stress hormone. (a) How does this hormone overcome stress conditions? (b) From where does this hormone get released in leaves?

  View Answer play_arrow

• question_answer71) We know that plants are harmed by excess water. But plants survive under flooded condition. How are they able to manage excess water?

  View Answer play_arrow

• question_answer72) Differentiate between diffusion and translocation in plants.

  View Answer play_arrow

• question_answer73)   How is facilitated diffusion different from diffusion?

  View Answer play_arrow

• question_answer74) Explain the mass flow hypothesis of transport in phloem.  

  View Answer play_arrow

• question_answer75) Observe the diagram and answer the following. (a) Are these types of guard cells found in monocots or dicots? (b) Which of these shows a higher water content (i) or (ii)? (c) Which element plays an important role in the opening and closing ofstomata?

  View Answer play_arrow

• question_answer76) Define uniport, symport and antiport. Do they require energy?

  View Answer play_arrow

• question_answer77) Minerals are present in the soil in sufficient amounts. Do plants need to adjust the type of solutes that reach the xylem? Which molecules help to adjust this? How do plants regulate the type and quantity of solutes that reach xylem?

  View Answer play_arrow

• question_answer78) Plants show temporary and permanent wilting. Differentiate between the two. Do any of them indicate the water status of the soil?

  View Answer play_arrow

• question_answer79)     Which of these is a Semipermeable Membrane (SP) and which is Selectively Permeable (SL)? (a) Animal bladder           (b) Plasmalemma             (c) Tonoplast                      (d) Parchment membrane 

  View Answer play_arrow

• question_answer80) Halophytes may show pre cell pressure very much higher than atmospheric pressure. Explain how this can happen?

  View Answer play_arrow

• question_answer81) The radio labelled carbon in carbon dioxide supplied to potato plants in an experiment was seen in the tuber eventually. Trace the movement of the labelled carbon dioxide.

  View Answer play_arrow

• question_answer82)   Water molecule is very polar. Polar end of molecule attracts opposite charges on another water molecule (acts like magnet). How will you explain this property of water with reference to upward movement of water? Comment on the upward movement of water given the intermolecular hydrogen bonding in water.

  View Answer play_arrow

• question_answer83) Comment on the experimental setup. (a) What does the setup demonstrate? (b) What will happen to the level of water if a blower is placed close tosetup? (c) Will the mercury level fluctuate (go up/down) if phenyl mercuric acetate is sprayed on leaves?

  View Answer play_arrow