Population Ecology

Which statement describes the role of the organism indicated by the blue arrow in the food web?

• Producers bring energy into the ecosystem by making organic molecules from sunlight or chemical compounds.

• Producers bring new energy into an ecosystem by breaking down inorganic materials and making new ones.

• Consumers feed other larger producers by breaking down organic molecules.

• Consumers recycle organic molecules like glucose for other species to use as food.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-3

What would happen in an ecosystem without herbivores?

• The populations of primary consumers would increase.

• The populations of secondary consumers would increase.

• The populations of primary producers would decrease.

• The populations of secondary consumers would decrease.

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Which statement describes the relationship between the deer and the bear on the food web?

• Autotrophs and heterotrophs share the same food source.

• Heterotrophs compete for the same food source.

• Heterotrophs supply food for the autotrophs.

• Autotrophs supply food for the heterotrophs.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

How do autotrophs make energy?

• They convert carbon dioxide, sunlight, and organic molecules to carbohydrates.

• They convert carbon dioxide, water, and organic molecules to carbohydrates.

• They convert carbon dioxide, water, and inorganic compounds into carbohydrates.

• They covert carbon dioxide, water, and sunlight into carbohydrates

Tags

NGSS.MS-LS1-6

What describes the diet of a saprotroph?

• Bones and feathers

• Animals and fungus

• Plants and fungus

• Dead plant matter

What trophic level do herbivores occupy in a food chain?

• Decomposer

• Primary consumer

• Producer

• Secondary consumer

What percent of energy is transferred between the levels indicated by the blue arrows?

• 100 percent

• 90 percent

• 50 percent

• 10 percent

Tags

NGSS.MS-LS2-3

What are the predators of the insect?

• Grasshopper and fish

• Lizard and frog

• Lizard and fish

• Grasshopper and frog