U5T9 – The Nitrogen Cycle & Phosphate Cycle

Which term describes an organism which feeds on dead organic matter and digests their food externally? (watch your spelling)

External digestion involves the secretion of enzymes outside of the organisms outer-most layer. Which term best describes this?

Many decomposers secrete enzymes to digest organic matter, then absorb the products they require. The digested products which are not required remain in the soil. The digestion of which organic substance will result in the presence of ammonia in the soil?

This diagram shows part of the nitrogen cycle. Which two processes form nitrification?

This diagram shows part of the nitrogen cycle. Which type of organism carry out process A?

This diagram shows part of the Nitrogen cycle. Name process E

Which process can occur due to the actions of Nitrosomonas bacteria?

Which process can occur due to the actions of Nitrosomonas bacteria?

Which process can occur due to the actions of Nitrobacter bacteria?

Denitrifying bacteria use nitrates in the soil to carry out respiration and produce nitrogen gas. Are the vast majority aerobic or anaerobic?

Nitrogen fixation from gas to compound, requires a large amount of energy (at least 16 ATP molecules and 8 electrons). A select few bacteria can carry out this task, but which of the following CANNOT fix nitrogen?

Which stage of the nitrogen cycle does the above equation represent?

Some fungi form symbiotic relationships with plant roots. What are these fungi/root structures called?

What are the strands of fungi called?

True or False : Fungi can increase the surface area of roots

True or False : Fungi can increase the uptake of water by a plant

True or False : Fungi can increase the uptake of inorganic ions from the soil by a plant.

True or False : Symbiotic fungi generally increase the amount of glucose in a plant.

Which of the following molecules require phosphorus? a) Protein b) DNA c) ATP

The above diagram shows the Phosphorus cycle. Name type of organism which carries out process A?

The above diagram shows the phosphorus cycle. Name process B

What is 'Guano'?

The concentration of nitrates and phosphates in the soil can be increased by the addition of fertiliser, but what ecological damage can this cause?

Nitrates and Phosphates are mostly soluble, so they can easily run off into waterways. What is this process called?

Put the following into the correct order:

a) Lower plants die due to lack of photosynthesis.
b)Fish die due to lack of dissolved oxygen.
c) Decomposers respire aerobically to decompose the dead plant matter.
d) Increased algae blocks out the light.
e) Minerals leach into the waterway.
f) Increased minerals cause an algae to grow rapidly.