Post- Assessment: Multiple Choice. Choose the letter of the best answer. Write the chosen letter on a separate sheet of paper.
1.Abiotic factors are
A. factors of atmosphere which affect life
B. chemical factors of soil which affect life
C. mechanical factors of soil which affect life
D. all non-living factors that sustain the living organisms

2.Which factor is responsible for poor vegetation in deserts?
A. low rainfallC. native mankind
B. poor sunlightD. grazing by animals and goats

3.When Sammi came in from a weekend away she noticed that all of the fish in her aquarium were dead. Which of the following most likely caused this?
A. The light caused the fish to stay to the bottom.
B. The temperature fell and the dissolved oxygen went down.
C. The temperature was very high and the dissolved oxygen decreased.
D. The temperature was very high and the levels of dissolved oxygen went up.

4.When there is a lot of pollution, rain can be acidic, harming plants and animals. What is this an example of?
A. a mutualistic type of symbiosis
B. an individual affecting a community
C. an abiotic factor affecting an ecosystem
D. competition between a population and a community

5.Which is an example of an abiotic element changing an area?
A. Introducing a new type of grassC. Water flooding the area
B. Two species of birds competingD. Algae growing on crabgrass

6.Which of the following would be an abiotic limiting factor for oysters living in Talaba, Bacoor?
A. The amount of algae
B. The number of parasites
C. The number of human collecting them
D. The amount of sediment in the water

7.Which of the following correctly represents an abiotic factor as the cause of a disease?
A. Ringworm - due to a fungal growth on the skin
B. Diarrhea - due to bacteria present in drinking water
C. Food poisoning - due to bacteria present in food and water
D. Arsenicosis - due to heavy metal arsenic residues present in drinking water

8.Temperature is an abiotic factor of an ecosystem because
A. It has almost no mass
B. It can move from one place to another.
C. It lacks all the characteristics of a living thing.
D. It is required for the survival of many organisms.

9.How do organisms return nutrients and water to the environment?
A. By cycling between temperature and moisture.
B. By cycling between evaporation and transpiration.
C. By cycling between the flora and fauna of the Earth.
D. By cycling between the abiotic and biotic environment.

10.Which of these phrases describes the abiotic factors of an ecosystem?
A. an environmental factor that tends to limit population size
B. the nonliving physical or chemical conditions of an environment
C. a species that lived in one place but that has moved to a new geographic location because of human interference
D. the complete process by which habitat loss results in the division of large, continuous habitats into a greater number of smaller patches of lower total area

11.During a long period when there is no rainfall, a mountain lion may temporarily leave its usual hunting territory to drink from a farm pond. This behavior is due to
A. its need to find a new habitat
B. its need to find different foods to eat
C. the change in a biotic factor in its environment
D. the change in an abiotic factor in its environment

12.Which is an example of how biotic and abiotic factors interact?
A. Humidity in the air forms fog in a valley.
B. Water and soil mix together to make mud.
C. Tree roots split apart rocks in the ground.
D. Sunlight increases the temperature of pond water.

13.Which is the main causative factor of desertification?
A. tourismC. irrigated agriculture
B. overgrazingD. developmental activities

14.Habitats are affected by environmental factors. Which one of the following factors is most unlikely to affect a habitat?
A. The soil type of the habitat.
B. The number of times it is photographed.
C. Competition between plants in the habitat.
D. The weather most prevalent in the habitat.

15.Which one of the following statements is incorrect?
A. Animals need plants as a source of food.
B. Plants depend upon animals for food and shelter.
C. Plants rely on animals to help them scatter their seeds.
D. Bacteria and fungi help plants to return minerals to the soil.​