Biodiversity

The variety of living things in an area is referred to as

• genes

• biodiversity

• abiotic

• natural selection

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Reduction in the sea otter population affected the Pacific coast ecosystem by

• decreasing the biodiversity

• reducing the number of sea urchins

• increasing the kelp beds

• increasing the salmon population

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Why is biodiversity important to an ecosystem?

• It allows animals to feed permanently from one type of plant.

• It helps populations adapt to ecological changes.

• It increases at each level of the food chain

• It allows for the easy extinction of a species

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1. What level of biodiversity is most commonly equated with the overall concept of biodiversity?

• genetic diversity

• species diversity

• both are commonly equated with biodiversity

• neither are equated with biodiversity

1. Reasons for preserving biodiversity include all of the following EXCEPT

• isolating unique genetic material so it can be incorporated into existing crops

• increasing the chances of discovering organisms with medicinal value

• preventing natural evolution

• survival of humans

The level of biodiversity that involves a variety of habits and communities is

• species diversity

• genetic diversity

• population diversity

• ecosystem diversity

1. A(n) _________________________ is any species that is essential to the health of an ecosystem.

• pioneer species

• gene

• keystone species

• invasive species

1. A recreational experience among life forms and ecosystems is called _______________.

• ecotourism

• species diversity

• ecodiversity

• none of the other answers

A(n) ____________________ is a segment of DNA that codes for a specific trait

• chromosome

• DNA strand

• centromere

• gene

1. The kind of diversity represented by all the different genes found in a population is called_________________________.

• genetic diversity

• Species diversity

• population diversity

• ecological diversity