Question: 11 :- Excessive exposure of humans to U V-rays results in
Answer:- (c) (i) and (iii)
Question: 12 :- In the following groups of materials, which group (s) contains only non-biodegradable items?
Answer:- (d) (ii) and (iv)
Question: 13 :- Which of the following limits the number of trophic levels in a food chain?
Answer: (a) Decrease in energy at higher trophic levels
Question: 14 :- Which of the statement is incorrect?
Answer:- (b) Green plants get their food from organic compounds
Question: 15 :- Which group of organisms are not constituents of a food chain?
Answer: (c) (ii) and (iii)
Question: 16 - The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about
Answer: (a) 1%
Question: 17 - In the given Figure 15.1 the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?
Answer: (c) T1
Question: 18 - What will happen if deer is missing in the food chain given below?
Grass â†’ Deer â†’ Tiger
Answer: (d) The population of tiger decreases and the population of grass increases
Question: 19 - The decomposers in an ecosystem
Answer: (b) Convert organic materials to inorganic forms
Question: 20 - If a grass hopper is eaten by a frog, then the energy transfer will be from
Answer: (c) Primary consumer to secondary consumer
Question: 21 - Disposable plastic plates should not be used because
Answer: (d) They are made of non-biodegradable materials
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