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Revision summary -B2 (OCR Gateway)
1. Difference between a natural and artificial ecosystem with examples:

Natural ecosystem: Is where humans don't control the processes going on within it.

Examples: Woodlands or lakes

Artificial ecosystem: where humans deliberately control the growth of certain living organisms and get
rid of others which…

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7. Binomial system: what do the two parts mean?

First part: the genus that the organism belongs to.

Genus= a group closely-related species

Second part: refers to the species

8. What is a species?

A group of closely related organisms that can breed to produce fertile offspring.

9. Why might…

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15. What's the difference between a parasitic and mutualistic relationship?

Parasites: live off a host; take what they need to survive without giving anything back. This often harms
the host.

For example: Fleas: dogs gain nothing from having fleas

Mutualism: is a relationship where both organisms benefit.

For example: oxpeckers…

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20. Why is glucose easily transported as a plant?

Glucose is soluble, which makes it really good for transporting to other places in the plant, it's also a
small molecule-so it can diffuse in and out easily.

21. Three uses of glucose in plants:

1) Respiration (for): plants use some…

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b) In glaciers if it's too cold for the decay microbes to work

c) Peat bogs are too acidic for decay microbes (A fully preserved man they named `Pete Marsh' was
found in a bog).

25. How fossils found in rocks support the theory of evolution:

`'The theory of evolution…

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Lichens are used to monitor air quality-they're damaged by pollution, the cleaner the air the greater
the diversity of lichens that survive.

Other species have adapted to live in polluted conditions so if you see a lot of them you know there's
a problem.

Bloodworms, water lice, rat-tailed maggots and…

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4) Humans cause pollution which harms many living things. E.g. pesticides and other pollutants in rivers
contributed to others becoming endangered.

5) We're increasing the competition between species. For example, red squirrels are now endangered
because of the competition from grey squirrels-which we introduced to Britain.

33. What is a…

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