Unit 5 Phosprous Cycle

Question 1

What’s mycorrhizae/ adaptations and how is beneficial for plant growth
(4 marks)

Answer 1

Mycorrhizae is a fungal association between plant roots and beneficial fungi

• it provides a large surface area for uptake of water and inorganic ions
• acts as a sponge so can absorb and hold water and minuet am easily
• making it more resistant to drought and able to take up more inorganic ions

Question 2

Why is the phosphorus cycle essential

Answer 2

Essential to form DNA, RNA, ATP and Phospholipid bilayer

Question 3

First stage of phosphorus cycle

how it enters

Answer 3

Phosphate ions enter by weathering when is taken by soil or water through rocks

Question 4

Second stage of phosphorus cycle

Answer 4

Plants assimilate(take in) phosphate ions

Question 5

3rd stage of phosphorus cycle

Feeding and what happens after decomposition

Answer 5

Animals feed on plants containing phosphate ions

And when they die and decompose(by saprobionts) the ions return to the soil