Ecosystem Factors & Environmental Change

Which of the following lists only biotic factors?

• Plants, insects, and mammals

• Rodents, water, reptiles, and amphibians

• Birds, fish, sunlight, and temperature

• Air, rocks, dirt, and water

Which of the following lists only abiotic factors?

• Humidity, pollution, and rats

• Clouds, deer, and grass

• Spiders, ants, and humans

• Sunlight, water, and air

Which of the following is an example of a biotic factor depending on an abiotic factor?

• Bears depending on fish for food.

• Shrubs depending on fungi to break down dead matter in the soil.

• Sharks depending on ocean water for a habitat and for oxygen.

• Cows depending on grass for food.

Plants require moisture, carbon dioxide, light, and minerals in order to survive. These are all examples of which of the following?

• Biotic factors

• Abiotic factors

• Living factors

• Biological factors

Which abiotic factors would you expect to influence the growth of trees in the mountains?

• Populations of mammals and insects

• Diversity of producers

• Rainfall and soil quality

• Predator and prey relationships

Which of the following is a biotic factor within an ecosystem?

• Herbivores that feed on producers

• Climate in the region

• Amount of oxygen in the air

• Amount of sunlight

Which of the following is an example of an abiotic factor affecting a biotic factor?

• The wolf population increases due to an increase in the deer population

• The sea lion population decreases due to a lack of food

• The temperature in a region increases due to an increase in sunlight

• An extreme drought causes the population of grass to decrease

Abiotic factors are important aspects of ecosystems because they directly affect the survival of biotic factors.

• True

• False

A healthy balance of biotic and abiotic factors within an ecosystem is not important.

• True

• False

An extreme freeze has very little impact on biotic factors within an ecosystem.

• True

• False