Unit 6 and 7

What factor contributes most to the sustainability of a habitat?

• Competition among large predators

• Large variety of organisms

• Presence of volcanic rock

• Absence of bacterial species

The ecosystem with the greatest sustainability will be the one that has the -

• greatest variety of different organisms.

• highest annual precipitation.

• lowest population of harmful insects.

• fastest growing season for green plants.

The Brazilian rain forest is an area with significant biodiversity. As the rain forest is replaced with agricultural land, it is reasonable to predict a reduction in -

• consumption of solar energy.

• sustainability over time.

• precipitation levels.

• average daily temperature.

An example of a typical pioneer species, that is one that appears in the earliest stages of ecological succession, is -

• oak trees

• spiders

• weeds

• humans

Ecological succession takes place in an area where -

• changes in the community's species composition occurs over time.

• an invasive species is artificially introduced.

• large organisms outcompete smaller organisms.

• weeds grow in a garden next to vegetables.

Plants that have deep roots, which extend, are able to reach cooler regions and absorb water that the roots of other plants can’t reach. This adaptation is expected in a habitat with which of the following climatic conditions?

• cool and sunny

• hot and arid

• wet and cloudy

• cold and dark

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

• A bird lays eggs in a nest.

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

• plants will not grow again in the burned area.

• bushes will grow in the area before weeds grow.

• weeds will grow in the area before trees grow.

• only trees will grow in the burned area.

The greatest sustainability is expected in the habitat with the -

• Most biodiversity

• Highest latitude

• Largest water supply

• Greatest biomass

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

• loosen the dirt for new trees to take root.

• provide food for animals returning to the area.

• require plenty of sunlight to make their own food.

• can grow rapidly even in areas with shallow soil.