1. Which of the following pairs of organisms has harmful interaction?
A Butterflies and flowers C. A bird's nest and a tree
B. Orchids and trunk of a tree
D. A snake and a rat

2. Which of the following can help conserve our ecosystem?
A. Protect the forests and bodies of water against harmful activities
B. Encourage the political leaders to build farm to market roads to
reach all beautiful places
C. Construct buildings near the river banks.
D. Improve the ecosystem by inviting tourists to visit your place.

3. In a community where there are predators and prey, one always
finds
A many more prey organisms than predators
B. many more predators than prey
C. equal number of predators and prey
D. many more animals than plants

4. One example of commensalism is when the plant like fern is attached
on a branch of a tree. Why is the interaction called commensalism?
A. They compete with each other.
B. Both a branch of a tree and a fem benefit from each other.
C. Only a branch of a tree is benefitted from the relationship.
D. A fern benefits from the relationship while a branch of a tree is
neither harmed nor benefitted.

5. Overpopulation affects the balance of nature. Which of the following is
not true about this statement?
A. More people will work, and the balance of nature could be
improved
B. It may result to death of some organisms.
C. More consumers may upset the balance of nature,
D. Overpopulation may result to fighting and struggle for survival,