PG-7.10ABC Ecosystems and Environments

Ecological succession usually includes changes in all of the following EXCEPT -

• the number of different kinds of plants

• the number of plants of any one species

• the rate at which species produce offspring

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in the process of ecological succession, grassess, appear before shrubs because grasses-

• loosen the dirt for new trees to take root

• provide food for animals returning to the area

• can grow rapidly even in areas with shallow soil

Which of the following contributes most to promoting sustainability in an ecosystem?

• Lack of decomposers

• A balance water table

• Variety of organisms

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Which of the following is an example of one stage in ecological succession?

• A tree falls over in a forest

• Weeds grow in a garden

• Fish swim in a pond

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After a catastrophic wildfire that clears the land of all plants and trees, -

• weeds will grow in the area before trees grow

• plants will not grow again in the burned area

• bushes will grow in the area before weeds grow.

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A forest is most sustainable when it has -

• tall trees only

• small shrubs only

• a variety of plant species

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The greatest sustainability is expected in the habitat with the -

• most biodiversity

• highest latitude

• largest water supply

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