Question 1 - Assertion Reasoning questions (MCQ) - Chapter 15 Class 10 - Our Environment

Assertion: Food chain is responsible for the entry of harmful chemicals in our bodies.

Reason: The length and complexity of food chains vary greatly.

Answer:

Food chain is the sequence of living organisms in a community in which one organism consumes another organism to transfer food energy.

The different organisms present at a certain trophic level in a food chain may intake certain harmful chemicals which are harmful to humans, this passes through each trophic level and reaches us.

Therefore, the food chain is responsible for the entry of harmful chemicals into our bodies.  

The length and complexity of food chains vary greatly.

Thus,

• Assertion is true.
• Reason is true.
• Reason is not the correct explanation for assertion.

So, the correct answer is (b).