Nitrogen Cycle

Question 1

Saprobiotic nutrition

Answer 1

Saprobionts are bacteria that feed on dead organic matter. They carry out extra cellular digestion by sectretinh enzymes onto matter than absorbing the products of digestion.

Question 2

Mycorrhizae

Answer 2

These are relationships between fungi and plant roots. Fungi are made of hyphae are long thin strands which connect to the plants roots

Question 3

Adapttatoins Mycorrhizae

Answer 3

Increases SA of the plant root for absorption of ions such as phosphates and nitrates and water. In addition the mycorrhizae acts as a sponge so holds water and minerals around the roots. In return the fungi obtain glucose from the plant. This is a symbiotic relationship (both organisms benefit)

Question 4

Effects of soil denitrification

Answer 4

NB denitrification occurs in anaerobic conditions eg waterlogged soil

Question 5

Importance of nitrogen cycle

Answer 5

Microorganisms are needed to convert nitrogen gas into nitrogen containing substances that plants and animals can absorb

Question 6

Key processes of nitrogen cycle

Answer 6

-Saprobiotic nutrition and microbes
-Ammonification
-Nitrification
-Nitrogen fixation
-Denitrification