1. Which is an abiotic component?

A. bird B. grass C. soil D. worm

2. Which demonstrates the oxygen-carbon dioxide cycle?

A. frog eating an insect C. orchid plant on a tree branch

B. fish and seaweeds in the sea D. small fish and shark in the sea

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3. Which of the following is a biotic component of an ecosystem?

A. rock B. soil C. water D. worm

4. Which of the gases below do plants need during photosynthesis?

A. carbon dioxide B. carbon monoxide C. hydrogen D. oxygen

5. What do you call the process in which plants manufacture their own food?

A. fertilization B. germination C. photosynthesis D. pollination

6. It refers to the continuous exchange of gases by plants and animals in the environment.

A. carbon – hydrogen cycle C. oxygen – nitrogen cycle

B. carbon – phosphorus cycle D. oxygen – carbon dioxide cycles

10. It surrounds the Earth of which all living organisms used in order to breathe.

A. air B. light C. soil D. water