WILLER ACADEMY

Class 10 Science Chapter 15 Quiz

Our Environment

1. The decomposers in an ecosystem:
a) Convert organic material to inorganic forms b) Convert inorganic material to simpler forms c) Convert inorganic material into the organic compound d) Do not break down the organic compound

2. Which group of waste materials can be classified as non-biodegradable?
a) Plant waste, used tea bags b) Polyethene bags, plastic toys c) Used tea bags, paper straw d) Old clothes, broken footwear

3. Which one of the following is an artificial ecosystem?
a) Pond b) Crop field c) Lake d) Forest

4. In a food chain, the third trophic level is always occupied by:
a) Carnivores b) Herbivores c) Decomposers d) Producers

5. Which of the following is a consequence of biomagnification?
a) Increase in population at higher trophic levels b) Accumulation of toxins in organisms at higher trophic levels c) Decrease in energy at higher trophic levels d) Increase in decomposer activity

6. What is an ecosystem? Give one example. (2 marks)

7. What is meant by trophic level? (2 marks)

8. Explain the role of decomposers in the environment. (3 marks)

9. Why is improper disposal of waste a curse to the environment? (3 marks)

10.
a) What is biomagnification? Explain with an example.
b) List two ways to manage garbage in your locality. (5 marks)

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