Ecosystems and Biodiversity

Which of the following describes a taiga?

• warm and moist

• exists only in the northern hemisphere

• treeless

• mostly deciduous trees

Which statement is true of ponds but NOT lakes?

• Plants surround the shore.

• Surface water contains organisms that use sunlight for

  photosynthesis.

• Sunlight reaches the bottom of the body of water

• People fill them in with sediment to create land for houses and

  other structures.

Which of the following situations contributes to the sustainability of an ecosystem

• Increase in biodiversity

• Decrease in biodiversity

• Extinction of a population from the ecosystem

• Removal of many populations of organisms

Tags

7.10b

Refer to the food web. If the grasses in each ecosystem are attacked and killed by a disease, which ecosystem will most likely survive?

• The prairie ecosystem, because few organisms eat grass.

• The tundra ecosystem, because there is a variety of producers.

• The prairie ecosystem, because there a fewer top predators.

• The tundra ecosystem, because it has more herbivores.

Tags

7.10b

Four students were asked to create a graph representing a typical predator–prey relationship. Which graph shows a situation in which the number of predators in a population depends on the number of prey?

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Tags

8.11b

Lions and cheetahs prey on wildebeests that graze in the grasslands of the African savanna. What likely effect would increased rainfall over several rainy seasons have on the populations of wildebeests, lions, and cheetahs?

• All three populations would increase.

• The wildebeests populations would decrease, and the lion and cheetah populations would increase.

• The wildebeests would increase, and the lion and cheetah populations would decrease.

• All three populations would decrease.

Tags

8.11a

A food chain will show...

• every animal in the ecosystem

• the direction of energy flow between organisms

• what an animals the top predator will want to eat

• the many different options that organisms have in an ecosystem

Tags

7.5b

What is a trophic level?

• Each energy/food level within a food chain or web.

• Levels of ecosystems that the world is divided into.

• Different levels of nutrients present within an organism.

• The levels of sunlight an autotroph needs to survive. 

Tags

7.5b

Which organisms have the most available energy in an energy pyramid?

• Producers

• Consumers

• Decomposers

• Detritivores

Tags

7.5b

Organisms that produce their own food mostly through photosynthesis (producers). Examples are plants and algae.

• Ominvore

• Detritivore

• Heterotroph

• Autotroph

Tags

7.5b