Free Ncert Solutions for 10th Class Science Our Environment - Studyadda.com

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10th Science Our Environment

1)

Which of the following groups contain only biodegradable items? (a) Grass, flowers and leather (b) Grass, wood and plastic (c) Fruit peels, cake and lime juice (d) Cake, wood and grass
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2)

Which of the following constitute a food chain? (a) grass, wheat and mango (b) grass, goat and human (c) goat, cow and elephant (d) grass, fish and goat
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3)

Which of the following are environment-friendly practices? (a) Carrying cloth-bags to put purchases in, while shopping. (b) Switching off unnecessary lights and fans. (c) Walking to school instead of getting your mother to drop you on her scooter. (d) All of the above.
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4)

What will happen if we kill all the organisms in one trophic level?
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5)

Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?
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6)

What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?
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7)

What are the problems caused by the nonbiodegradable wastes that we generate?
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8)

If all the wastes we generate are biodegradable, would it have no impact on the environment?
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9)

Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?
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10)

Why are some substances biodegradable and some non-biodegradable?
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11)

Give any two ways in which biodegradable substances would affect the environment.
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12)

Give any two ways in which non-biodegradable substances would affect the environment.
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13)

What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
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14)

What is the role of decomposers in the ecosystem?
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15)

What is ozone and how does it affect any ecosystem?
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16)

How can you help in reducing the problem of waste disposal? Give any two methods.
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17) Which one of the following is an artificial ecosystem? (a) Pond (b) Crop field (c) Lake (d) Forest
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18) In a food chain, the third trophic level is always occupied by (a) carnivores (b) herbivores (c) decomposers (d) producers
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19) An ecosystem includes (a) all living organisms (b) non-living objects (c)both living organisms and non-living objects (d)sometimes living organisms and sometimes non-living objects
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20) In the given food chain, suppose the amount of energy at fourth trophic level is 5 kJ, what will be the energy available at the producer level? GrassGrasshopperFrogSnake Hawk (a) 5 kj (b) 50 kj (c) 500 kj (d) 5000 kj
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21) Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as (a) eutrophication (b) pollution (c) bio-magnification (d) accumulation
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22) Depletion of ozone is mainly due to (a) chlorofluorocarbon compounds (b) carbon monoxide (c) methane (d) pesticides
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23) Organisms which synthesize carbohydrates from inorganic compounds using radiant energy are called (a) decomposers (b) producers (c) herbivores (d) carnivores
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24) In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of (a) heart energy (b) light energy (c) chemical energy (d) mechanical energy
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25) Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the (a) food web (b) ecological pyramid (c) ecosystem (d) food chain
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26) Flow of energy in an ecosystem is always (a) unidirectional (b) bidirectional (c) multidirectional (d) no specific direction,
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27) Excessive exposure of humans to UV-rays results in (i) damage to immune system (ii) damage to lungs (iii) skin cancer (iv) peptic ulcers (a) (i) and (ii) (b) (ii) and (iv) (c) (i) and (iii) (d) (iii) and (iv)
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28) In the following groups of materials, which group(s) contains only non-biodegradable items? (i) Wood, paper, leather (ii) Polythene, detergent, PVC (iii) Plastic, detergent, grass (iv) Plastic, Bakelite, DOT (a) (iii) (b) (iv) (c) (i) and (iii) (d) (ii) and (iv)
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29) Which of the following limits the number of trophic levels in a food chain? (a) Decrease in energy at higher trophic levels (b) Deficient food supply (c) Polluted air (d) Water
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30) Which of the statement is incorrect? (a) All green plants and blue-green algae are producers (b) Green plants get their food from organic compounds (c) Producers prepare their own food from inorganic compounds (d) Plants convert solar energy into chemical energy
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31) Which group of organisms are not constituents of a food chain? (i) Grass, lion, rabbit, wolf (ii) Plankton, man, fish, grasshopper (iii) Wolf, grass, snake, tiger (iv) Frog, snake, eagle, grass, grasshopper (a) (i) and (iii) (b) (iii) and (iv) (c) (ii) and (iii) (d) (i) and (iv)
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32) The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about (a)1% (b) 5% (c)8% (d)10%
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33) In the given figure, the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available? (a) (b) (c) (d)
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34) What will happen if deer is missing in the food chain given below? Grass Deer Tiger (a) The population of tiger increases (b) The population of grass decreases (c) Tiger will start eating grass (d) The population of tiger decreases and the population of grass increases
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35) The decomposers in an ecosystem (a) convert inorganic material to simpler forms (b) convert organic material to inorganic forms (c) convert inorganic materials into organic compounds (d) do not breakdown organic compounds
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36) If a grasshopper is eaten by a frog, then the energy transfer will be from (a) producer to decomposer (b) producer to primary consumer (c) primary consumer to secondary consumer (d) secondary consumer to primary consumer
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37) Disposable plastic plates should not be used because (a) they are made of materials with light weight (b) they are made of toxic materials (c) they are made of biodegradable materials (d) they are made of non-biodegradable materials
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38) Why is improper disposal of waste a curse to environment?
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39) Write the common food chain of a pond ecosystem.
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40) What are the advantages of cloth bags over plastic bags during shopping?
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41) Why are crop fields known as artificial ecosystem?
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42) Differentiate between biodegradable and non-biodegradable substances. Give examples.
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43) Suggest one word for each of the following statement/definitions. (a) The physical and biological world where we live in (b) Each level of food chain where transfer of energy takes place (c)The physical factors like temperature, rainfall, wind and soil of an ecosystem (d) Organisms which depend on the producers either directly or indirectly for food
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44) Explain the role of decomposers in the environment.
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45) Select the mis-matched pair in the following and correct it.

(a)Bio-magnification Accumulation of chemicals at the successive trophic levels of a food chain

(b)Ecosystem Biotic components of environment

(c) Aquarium A man-made ecosystem

(d) Parasites Organsims which obtain food from other living organisms

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46) We do not clean ponds or lakes, but an aquarium needs to be cleaned . Why?
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47) Indicate the flow of energy in an ecosystem. Why is it unidirectional? Justify.
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48) What are decomposer? What will be the consequence of their absence in an ecosystem?
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49) Suggest any four activities in daily life which are eco-friendly.
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50) Give two differences between food chain and food web.
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51) Name the wastes which are generated in your house daily. What measures would you take their disposal?
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52) Suggest suitable mechanism(s) for waste management in fertilizer industries.
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53) What are the by-products of fertilizer industries? How do they affect the environment?
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54) Explain some harmful effects of agricultural practices on the environment.
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