B3 - Revision Cards

This is for OCR 21st Century.

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  • Created by: mathusa
  • Created on: 26-05-12 10:54
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B3 ­ Revision Cards
Classification = putting living things into groups based on their similarities
Kingdom Animalia ­ biggest group that humans belong to
Homo sapiens ­ smallest group that humans belong to
Fish adaptations
Species = Animals from the same species can breed together and produce fertile offspring
Adaptations = features that help organisms to survived in their environment
New Species could cause extinction of another species BECAUSE....
Extinction - when all the members of a species die out.
Food Webs show the interdependence of living organisms.
Food chains all start with producers.

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Consumers cannot make their own food so they take in organic materials e.g. animals.
They break down food molecules in respiration.
Animals use energy produced by respiration for life processes e.g. keeping warm
Only about 10% of the energy at each stage gets passed on. The rest:
Used for life processes e.g. movement
Escapes into environment as heat energy
Excreted as waste and passes to decomposers
Cannot be eaten passes to decomposer
Decomposers ­ feed on dead organisms and waste materials in ecosystem
E.g.…read more

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Plant takes
nitrates to make proteins
2) Primary consumers eat plants, digest the plant protein
3) Use the products called amino acids to make their own animal proteins
Problems of farmers using chemical fertiliser
1) Chemical fertilisers very soluble in water
2) Water rich in nitrate con drain from fields into streams, rivers and lakes ­ raising
nitrate levels in water
3) High levels can cause growth of microscopic organism (plankton), form in massive
"algal blooms"
4) Bloom can cause sickness to animal/people drinking the…read more

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Conditions have to be right for fossils to develop, only few things end up
as fossils
There are gaps in fossil records
Selective Breeding
Choosing organisms from the same species with different characteristics and
breed them to get offspring that has the characteristics which are
needed/wanted.…read more


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