Topic 9

Question 1

What is parasitism

Answer 1

Parasites live in or on another organism which is called the host
The parasite takes what it needs from the host but the host receives nothing amd sufferers as a result - shows dependancy

Question 2

What is mutualism

Answer 2

Where both species benefit from each other

Such as bees and flower plants

Question 3

Describe quadrats practical

Answer 3

Find area of field
Randomly choose coordinate on field
Count organism in area in quadrat (1 metre Sqaure)
Find the mean of organisms on each coordinate and times by area of field

Question 4

What does an organisms throphic level describe

Answer 4

Where it fits into a food chain

Question 5

What do microorganisms and decomposers do In the carbon cycle

Answer 5

Decomposers break down dead material from plants and other organisms and release carbon dioxide into the atmosphere where it’s available to plants for photosynthesis

Question 6

How are nitrates made available for plant uptake

Answer 6

Farmers use fertilisers like ammonium nitrate to help crops grow and increase yield
Ammonia converted to nitrates by nitrifying bacteria in the soil. Plants absorb the nitrate and use them to build up proteins