Unit 7 Review

Which adaptation would help an animal in a cold environment?

• long eyelashes

• 2 layers of fur

• gills

• sharp teeth

Which of these places would you find the greatest variety and numbers of animal life?

• in a mowed, front lawn

• in the middle of the pond

• in the pond with rocks, water, grass, and plants

• near the sidewalk

If your local environment begins to change into a completely different environment, what will most likely happen to the current organisms?

• their populations will increase

• they will not be affected

• the new environment can't support any life

• different organisms will survive better than the current ones

How would you compare a lake and ocean environment?

• they have the same organisms

• one is freshwater and one is saltwater so they have different organisms

• they have the same organisms but the water looks different

Increased biodiversity results in a more sustainable ecosystem because —

• a greater number of plant species means that there is less barren land

• a greater variety of species present allows more organisms to adapt after changes occur

• the transition area between two ecosystems is narrower

Which ecosystem is likely to be the LEAST sustainable?

Show Answers

• grassy lawn on school property

• small pond with plants around the edge

• farming (agricultural) field

• wooded area along a stream

How does biodiversity contribute to the sustainability of an ecosystem?

• makes it more likely for them to survive an ecological disaster

• makes it more likely they will survive a disease outbreak

• the variety ensures that all levels of the energy pyramid have food

• all are correct

Which organisms are common pioneer species?

• conifer trees

• mosses and lichen

• grass and weeds

• shrubs

What is the function of a pioneer species?

• make the area safer for predators

• invade the area to keep others out

• modify the area to allow others in

Some students take care of a vegetable garden. When it is time to plant in the spring, the students leave part of the garden empty in order to observe ecological succession. Which of these will most likely occur first?

• development of topsoil

• growth of weeds and grasses

• growth of trees and shrubs

• a stream will form