BIOLOGY

Created by: rachelbell
Created on: 29-04-14 17:19

The crocodile and crocodile bird are members of food chains in a habitat. State the type of organism that is found at the start of most food chains.

plantae

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Using examples, explain how the survival of parasites depends on the presence of other species.

• a parasite is an organism which depends on a host for its survival • without the host benefiting • fleas and headlice • these feed on the blood of other organisms • tapeworms • their action on the human alimentary canal • mistletoe • with its paras

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The active compound in cigarette smoke that causes lung cancer is

tar

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Explain the effect of breathing in carbon monoxide on the function of the blood.

• carbon monoxide binds with red blood cells • containing haemoglobin • this reduces the oxygen carrying capacity of the blood

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Variation may arise due to the geographic isolation of a species. Explain how geographic isolation of members of one species can lead to a new species evolving.

• speciation (1) • different geographical area may have different selection pressures / environmental conditions (1) • those individuals of a species suited /adapted / to this environment will survive and breed (1) • adaptations/genes passed down to

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Plants use nitrates to make

proteins

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Explain how different types of bacteria act to increase nitrate concentration in the soil.

• nitrogen fixing bacteria (1) • fix nitrogen gas for the plant (1) • decomposing bacteria / decomposers (1) • decompose / break down animal / plant matter / protein / urea (1) • into ammonia (1) • (then) nitrifying bacteria (1) • convert ammonia / n

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Other cards in this set

Card 2

Front

Using examples, explain how the survival of parasites depends on the presence of other species.

Back

Card 3

Front

The active compound in cigarette smoke that causes lung cancer is

Back

Card 4

Front

Explain the effect of breathing in carbon monoxide on the function of the blood.

Back

Card 5

Front

Variation may arise due to the geographic isolation of a species. Explain how geographic isolation of members of one species can lead to a new species evolving.