Question

Consider the following statements: 
Every step in a food chain is called a trophic level. 
Decomposers convert complex organic matter into simple substances that mix with the soil. 
In a food chain, energy increases from lower to higher trophic level.
Interlinking of multiple food chains forms a food web. 
Which of the above statements are correct?

• A. Only I
• B. I and IV
• C. I, II and IV
• D. II and IV

Hint:

Energy decreases at higher trophic levels due to energy loss; decomposers play a key role in nutrient recycling.

Answer 1

The Correct Option is C

Let's examine each statement logically:

1. Every step in a food chain is called a trophic level.
   This statement is correct. In ecology, each step or level in a food chain is known as a trophic level, where organisms obtain their energy.
2. Decomposers convert complex organic matter into simple substances that mix with the soil.
   This statement is correct. Decomposers such as fungi and bacteria break down dead organisms and organic waste, returning essential nutrients to the soil.
3. In a food chain, energy increases from lower to higher trophic level.
   This statement is incorrect. In reality, energy decreases as it moves up the trophic levels due to energy being lost as heat during the transfer.
4. Interlinking of multiple food chains forms a food web.
   This statement is correct. A food web is a more complex network of interconnected food chains within an ecosystem.

Therefore, the statements that are correct are I, II, and IV.