1. Which food chain does occur in the forest ecosystem?
A. grass → caterpillar → chicken
B. corn → mouse → snake
C. grass → wilder beast → lion
D. worm berries → caterpillar → raven
2. Why is producer important in an ecosystem
A. It is the source of food to the consumers.
B. It is an organism that eats plants.
C. It breaks down organism into smaller particles.
D. It is a series of feeding relationship.
3. What kind of interaction is shown when animals like crabs and mollusks help break down plantlitter in a
mangrove ecosystem through grazing
A. competition
C. parasitism
B. commensalism
D. mutualismi
4. Which of the following characterizes a tropical rainforest ecosystem?
1. It is located at the polar zones.
II. It has diverse plant and animal species
III. It is situated in tropical places.
IV. It caters to few plants and animals.
A. I and II
B. II and III
C. I and III D. III and IV
5. Why is the relationship between the corals and the algae in the coral reefs considered mutualistic?
A. The corals benefit in the interaction and not the algae.
B. The corals receive oxygen from algae, the algae get protection from corals.
C. The corals receive oxygen from algae while the algae are harmed.
D. The corals and algae live together without harming each other.
6. Which of the following is the role of crustaceans like crabs in the mangrove ecosystem?
A. They attach themselves to the roots of mangroves
B. They help break down leaf litter through grazing.
C. They serve as food of other animals.
D. They find food in the mud.​