11. There are different species of animals and plants living together in the same environment. How is this organization classified?
A association
B. community
C. ecology
D. population

12. In a community where there are predators and prey, one always finds _____.
A. Many more predators than prey
B. Many more animals than plants
C. Equal numbers of predators than plants
D. Many more prey organisms than predators

13. Which of the following statements are true about changes in the size of pupolation!?
1. Birth increases the population
2.Birth decreases the population
3. Death decreases he population
4. Death increases the population
A. 1 and 2
B. 1 and 4
C. 2 and 3
D. 2 and 4

14. What happen if there are more predators than preys in an ecosystem?
A. the source of food will increase.
B. The source of foods will decrease.
C. The source of foods will remain the same.
D. Other animals will also decrease in number.

15. Why is relationships between a bee and a flower considered mutualistic?
A. The bee benefits from the interaction because of nectar it gets from the flower
B. The flower Benefits from the the interaction because of pollen grain being transferred by the bee from one flower to another.
C. Both the bee and the flower benefit from the interaction because of the good things that contribute to their development.
D. The bee benefits from the interaction while the flower is affected.

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

17. You put twelve fish in an aquarium which contains three gallons of water. You fed them with the right amount of food. After Five days, some of the fish died. Why did it happen?
A. The smelly and cloudy water in the aquarium was not replaced
B. The aquarium did not have enough Temperature range
C. There was no enough space for the number for fish
D. The aquarium was moved to another place.

18. Man interferes with the balance of nature when he _________.
A. Pollutes air and water
B. Practice selective logging
C. Disposes his garbage properly
D. Helps control overpopulation by practicing family planning

19. Overpopulation affects the balance of nature. Which of the following does not support this statement.
A. It may result to death of some organisms.
B. More consumers may upset the balance of nature.
C. Overpopulation may result to fighting and struggling for survival.
D. More people will work and the balance of nature could be improved.

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

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