Biology PYQ 198 of 227 · Ecology, Ecosystem & Biodiversity

With reference to 'Ecosystem', which of the following statements is/are correct?
1. Green plants in terrestrial ecosystem capture about 1% of energy of the sunlight that falls on their leaves.
2. Around 10% of organic matter reaches to the next higher level of consumers. Select the correct answer from the code given below:

  1. AOnly 1
  2. BNeither 1 nor 2
  3. CBoth 1 and 2
  4. DOnly 2

UPPSC 2025

Show answer and explanation

Correct answer: (c) Both 1 and 2

Explanation

Green plants capture only about 1% of the sunlight falling on their leaves; the rest is reflected, transmitted, or lost as heat (Statement 1 correct).

By the 10% law of energy transfer, only about 10% of organic matter/energy passes to the next higher trophic level (Statement 2 correct).

The remaining energy is lost in respiration, heat, and inedible parts at each level.

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