Agricultural Farming

Question 1

What is the process of ammonium ions to nitrite?

(1)

Answer 1

-nitrification

Question 2

What is the process of nitrate ions into nitrogen

(1)

Answer 2

-denitrification

Question 3

Why does leguminous crops, with NF bacteria in nodules on their roots, grow better on soils with low conc of nitrate ions?

(2)

Answer 3

-N converted to ammonia
-produce aa

Question 4

Using water potential, why does high conc of fertilisers to soil reduce plant growth?

(2)

Answer 4

-soil has lower WP
-plant takes up less water via osmosis

Question 5

Suggest two advantages of processing waste in anaerobic digesters rather than open ponds

(2)

Answer 5

-conditions can be controlled
-products can be collected

Question 6

Why would an anaerobic digester stop working without the cooling system?

(2)

Answer 6

-respiration increases heat
-denatures enzymes

Question 7

Explain the consequences of leaching from over-application of fertiliser in ponds and lakes

(6)

Answer 7

-more algae/surface plants blocks light
-cant photosynthesise so plants die
-saprobionts breakdown dead material
-aerobically respire
-less O2 for fish to respire
-dead plants cant photosynthesise so less O2

Question 8

Give an advantage of using natural fertiliser produced in the digester rather than an artificial fertiliser

(1)

Answer 8

-less leaching