Directions: Read each question carefully. Choose the letter of the correct answer. Write
your answer on the blanks.
6. Which of the following pairs of organisms has harmful interaction?
a. a snake and a rat
c. a bird's nest and a tree
b. orchids and a trunk of a tree d. butterflies and flowers
7. 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. Both a branch of a tree and a fern benefit from each other.
b. Only a branch of a tree is benefitted from the relationship.
c. A fern benefits from the relationship while a branch of a tree is neither harmed
nor benefitted.
d. They compete each other.
8. What will happen if there are more predators than preys in an ecosystem?
c. The source of food will remain the same.
a. The source of foods will increase.
d. Other animals will also increase in number.
b. The source of foods will decrease.
9. The type of interaction where one benefits while the other one is harmed or badly
affected is called
d. Commensalism
a. Predation
b. Parasitism c. Competition
10. What kind of interaction is shown below? plants, worm, bird, snake, hawk
a. competition
b. commensalism c. parasitism d. predation​