Multiple choice

Which of the following statements is/are correct about plants?

  1. In a food chain, plants are known as 'producers of energy'.
  2. All plants are categorized under the autotrophic mode of nutrition.
  3. Plants follow the '20% law of transfer of energy'.

  1. Only 1

  2. Only 2

  3. Only 1 and 3

  4. Only 2 and 3
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A Correct answer
Explanation

(1) Plants are called 'producers of energy' because they start the food chain by synthesizing food in the presence of sunlight.

(2) Not all plants are categorized under autotrophic mode of nutrition. There are some carnivorous plants also, which trap insects and get nutrition from them. For example, Drosera, Venus Flytrap and Nepenthes.
(3) All trophic levels of a food chain follow the 'ten percent law', i.e. only about 10% energy is transferred from one trophic level to the next trophic level.

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