1. Every food chain in the ecosystem begins with……….which are the original source of food.

2. We should reduce the use of the plastic bags, bottles etc. because:

3. Among the following choose the correct option which contains only biodegradable items?
i. Wood, paper, PVC
ii. Paper, seeds, detergent,
iii. Paper, animal excreta, wood
iv. Wool, leaves, paper

4. Which among the following statements is incorrect in view of the plants?

5. Green plants utilize ……… percent of sun’s energy to prepare their food by the process of photosynthesis?

6. Which among the following is a correct full form for DDT?

7. If 100 J energy is available at the producer level in a food chain then the energy available to the secondary consumer will be

8. Which of the following radiations is responsible for the conversion of atmospheric oxygen to ozone?

9. What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger

10. Global warming is a phenomenon related to: