SUMMATIVE TEST #3 Direction: Choose the letter of the correct answer. Write your answer on the space provided.
1. Which of the following human activities is the major cause of species extinction in the Philippines?
A. Deforestation
B. Illegal hunting
C. Fine net fishing
D. Muro-ami
2. What is the possible effect if the population of fishes continue to decrease?
A. There will be enough habitats for large fishes. B. Biodiversity of seas and ocean will become high.
C. Species of plants will dominate the seas and ocean.
D. People and the large species of fish will also decrease.
3. What will happen to fishes if there will be continuous run-off containing nutrients in rivers?
A. Algae over produce and die; bacteria used up all the oxygen so fish die.
B. Algae overproduce and crowd out fish and other species.
C. Algae overproduce and eat all possible sources of food then starve.
D. Algae overproduce oxygen, which is toxic to fish in high quantities.
4. If the population species of a given area is doubled, what effect would this have on the resources of the community?
A. Competition for resources would increase as resources decline.
B. Competition for resources would decrease as resources decline
C. Competition for resources would increase as resources incline
D. Competition for resources would decrease as resources incline
5. In a population, limiting factors and population density are often related. Suppose that the population density of plant seedlings in an area is very high, explain how limiting factors may affect population density.
A. The greater the population density, the greater the effect of limiting factors.
B. The greater the population density, the lesser the effect of limiting factors.
C. The lesser the population density, the lesser the effect of limiting factors.
D. The lesser the population density, the greater the effect of limiting factors.​