Review Ecology

This is a biotic factor:

• grass

• rocks

• soil

Rabbits and deer eat leaves, twigs, fruits and nuts, grass, corn, and alfalfa. Are the items listed in their diet biotic or abiotic?

• biotic

• abiotic

What are some examples of resources over which plants compete?

• space, water, and animals

• water, light , and space

• sugar, temperature and carbon dioxide

In a certain ecosystem, foxes and snakes prey on the same rabbits. What would INCREASE the competition between the foxes and snakes?

• increase in foxes and snakes

• A smaller habitat for the foxes, snakes, and rabbits

• A reduction (lfewer) rabbits in the ecosystem

• All of the above

What is competition in an ecosystem?

• How all the living and nonliving things in an area interact.

• A single, self-contained living thing

• More than one individual or population that depends on the same limited resources.

What is an ecosystem?

• Something in the environment that is needed for organisms to survive but is only available in fixed amounts

• A system that includes all the biotic and abiotic factors in an area and their interactions

• A system that includes all the biotic factors in an area and their interactions

Grass would not survive in a backyard ecosystem in July if it did not have sunlight and water for three weeks in northwest Arkansas. Sunlight and water are:

• independent factors for grass

• dependent factors for grass

• biotic factors for prass

Which factor is NOT abiotic?

• water

• seaweed

• sand

• sunlight

Which factor is NOT biotic?

• a dead tree

• a flower

• a snake skin

• soil

Refer to the food chain above. If a disease causes most of the pike in the pond to die, what will most likely happen to the perch population?

• Osprey will eat the perch so the population of perch will decrease.

• The perch population will increase, which will cause a decrease in the minnow population.

• The perch population will stay the same because it has no predator.