Section 3-3 Cycles Of Matter

Question 1

4 elements that make up 95 percent of the body

Answer 1

Oxygen, carbon, hydrogen, nitrogen

Question 2

How is the movement of matter through the biosphere different from the flow of energy

Answer 2

Flow of energy- 1 way

Matter is recycled within and between ecosystems

Question 3

Matter moves through an ecosystem in

Answer 3

Biochemical cycles

Question 4

What do biological cycles connect

Answer 4

Biological, geological, and chemical aspects of the biosphere

Question 5

Transpiration

Answer 5

Water can enter the atmosphere by evaporating from the leaves of plants

Question 6

Involved in water cycle

Answer 6

Precipitation

Evaporation

Question 7

Nutrients

Answer 7

All the chemical substances that an organism needs to sustain life and its nutrients

Question 8

3 nutrient cycles that play especially prominent roles in the biosphere

Answer 8

Carbon cycle
Nitrogen cycle
Phosphorus cycle

Question 9

Large reservoirs where carbon is found in the biosphere:

Carbon dioxide gas

Answer 9

Atmosphere

Question 10

Large reservoirs where carbon is found in the biosphere:

Dissolved carbon dioxide

Answer 10

Ocean

Question 11

Large reservoirs where carbon is found in the biosphere:

Coal, petroleum, and calcium carbonate rock

Answer 11

Underground

Question 12

Process that plants use carbon dioxide

Answer 12

Photosynthesis

Question 13

Why do all organisms require nitrogen?

Answer 13

To make amino acids

Question 14

Nitrogen fixation

Answer 14

Atmospheric nitrogen is assimilated into organic compounds such as ammonia

Question 15

Denitrification

Answer 15

Conversion of nitrates to insert nitrogen gas

Question 16

Role of denitrification in nitrogen cycle

Answer 16

Releases nitrogen into the atmosphere

Question 17

Phosphorus cycle

Answer 17

Phosphate is released as rocks and sediments wear down

Plants absorb phosphate from the soil or form water

Question 18

Why is phosphorus essential to living things

Answer 18

It forms part of important life-sustaining molecules such as DNA or RNA

Question 19

Primary productivity of an ecosystem

Answer 19

Rate at which organic matter is created by producers

Question 20

If a nutrient is in short supply in an ecosystem, how will it affect an organism?

Answer 20

It will limit an organism’s growth

Question 21

When is a substance called a limiting nutrient?

Answer 21

When an ecosystem is limited by a single nutrient that is scarce or cycles very shortly

Question 22

Why do algal blooms occur?

Answer 22

There are more nutrients available so the producers can grow and reproduce more quickly.