nutrient cycles

Question 1

once nitrogen is present in nodules of legumes how does it increase plant growth

Answer 1

conversion of nitrogen to ammonia
produces amino acids / ATP

Question 2

upwelling often results in high primary productivity in costal waters
explain why some of the most productive fishing areas are found in costal waters

Answer 2

• nitrate and phosphate absorbed by algae
• increased algae increases number of fish via reproduction of fish

Question 3

suggest what scientists would have done in the drying process to ensure all the water had been removed from samples

Answer 3

dry and measure mass
repeat drying process until mass remains constant

Question 4

describe the role of saprobients in the enviroment

Answer 4

• saprobients secreate enzymes that break down dna/ rna /dead plant
• nitrogen into ammonia