NCERT Class X Science Class: Chapter –15. Our Environment – Part-3

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Question 13:

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

Answer: A

Image Light energy and Chemical Energy

Image Light Energy and Chemical Energy

Question 14:

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

Answer: B

Question 15:

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)

Answer: C

Image Food Chains

Image Food Chains

Question 16:

The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about





Answer: A

Question 17:

In the given Figure the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?





Image Various trophic levels

Image Various Trophic Levels

Answer: C

Question 18:

What will happen if deer is missing in the food chain given below?

(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

Answer: D

Image The population of tiger decreases

Image the Population of Tiger Decreases

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