DIRECTIONS :Choose the best answer from the given choices. Write your answer in

your answer sheet. Avoid erasures

1.The specific environment of the ecosystem in which an organism lives is the

organism’s _________.

a. species b. habitat c. niche d. biotic factor

2.Organisms that capture the energy of sunlight through photosynthesis include

plants, certain microorganisms, and __________

a. omnivores b. algae c. heterotrophs d. insects

3.In most ecosystems, the producers are __________

a. green plants, algae, cyanobacteria

b. plants and fungi

c. animals and fungi d. humans

4. The three major biotic components of every ecosystem are _____________

a. producers, herbivores, carnivores

b. producers, consumers, detritus feeders/decomposers

c. plants, animals, climate

d. energy, water, mineral nutrients

5. While exploring a cave, a group of scientists encountered many abiotic and biotic

factors. Which of the following factors is biotic?

a. bacteria b. limestone c. minerals d. waterfall

6. An herbivore population may ______________

a. oscillate up and down as its major predator increases and decreases in

number

b. exceed its carrying capacity if its major predator is removed

c. exceed its carrying capacity when it is introduced to a new community

d. all of the above

7. In natural communities, what condition is likely to cause a disruption or

imbalance among species?

a. removal of a predator

b. introduction of a foreign species

c. overgrazing

d. all of the above

8. Which of the following is a biotic factor in an ecosystem?

a. air b. soil c. water d. tree

9.How is energy replenished in ecosystems?

a. by the sun

b. by body functions

c. by recycling

d. by food chains

10. Which of the following exist only as parasites?

a. bacteria b. fungi c. insects d. viruses​