Cycling of CHON through living systems

Question 1

What are the 6 primary atoms that all organisms contain?

Answer 1

CHONPS (Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorous, Sulfer)

Question 2

Unlike energy, matter is ________.

Answer 2

recycled

Question 3

Reservoir

Answer 3

Where the element is when its
not part of an organism

Question 4

What do elements cycle between?

Answer 4

reservoirs and organisms

Question 5

What are the 2 common reservoirs?

Answer 5

Water and the atmosphere

Question 6

What elements are found in the atmosphere?

Answer 6

Carbon (CO2) and Nitrogen (N2)

Question 7

What elements are found in water?

Answer 7

Oxygen (H2O) and Hydrogen (H2O)

Question 8

What elements are found in sediments?

Answer 8

Phosphorous and Sulfur (Soil and Ocean beds)

Question 9

What does the cycling of C, H, and O connect?

Answer 9

photosynthesis & cellular respiration

Question 10

What is nitrogen needed?

Answer 10

Needed for proteins and nucleic acids

Question 11

What percentage of nitrogen is on earth?

Answer 11

80%

Question 12

Why is atmospheric N2 is not usable by most organisms?

Answer 12

N2 is very inert, unreactive

Question 13

Nitrogen enters ecosystems through ________ _________.

Answer 13

nitrogen fixation

Question 14

Nitrogen-fixing bacteria (NFB)

Answer 14

convert unusable inert N2 into reactive, usable ammonia and
nitrate

Question 15

Where does NFB live?

Answer 15

in soil & on the roots of some plants

Question 16

Nitrogen fixation provides ______ of the N
needed for living things.

Answer 16

~5%

Question 17

Nitrogen Recycling provides _______ of the
N needed for living things.

Answer 17

~95%

Question 18

What is the process where N is returned to the air as N2?

Answer 18

Denitrification