Biology revision sheet

For Year 8 revision

HideShow resource information
  • Created by: India
  • Created on: 21-04-12 19:07
Preview of Biology revision sheet

First 253 words of the document:

What are the uses of muscles in breathing?
Muscles help breathing by contracting and relaxing.
For example, intercostal muscles contract (upwards and outwards) and
relax (inwards and downwards) to help control breathing.
This also applies to the diaphragm, which also contracts (flattens) and
relaxes (becomes dome-shaped) to control breathing.
Parts of a seed
Food store - provides nutrients such as starch ready for germination.
The testa ­ this is a tough protective outer coat.
Radicle ­ becomes the root.
Plumule ­ becomes the shoot.
How are plants adapted?
Water dispersal ­ if a plant lives near water then the seeds adapt to
Wind dispersal ­ seeds are light, long surface area and small.
Animal dispersal ­ small, often inside a fruit to encourage plants to eat
it. Sticky so that they can catch onto an animal's fur.
What is the function of the pollen tube in the style?
After pollination, the pollen grain grows a long pollen tube down the style
to the ovule inside the ovary.
The male nucleus in the pollen then joins the female sex cell.
The fertilised ovule then develops into a seed.
The main types of microorganism and examples
Virus ­ cold, flu. 80nm. No nucleus. Cannot reproduce on its own.
Bacteria ­ yeast, e.coli, salmonella. 5um. Nucleus. Can reproduce on its own.
Fungi ­ Athletes' foot. Size varies. Nucleus. Can reproduce on its own.

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Hypothesis ­ your prediction of the result.
Independent variable ­ the thing you change.
Dependent variable ­ the thing which changes due to the independent
variable changing.
Control variables ­ Factors which could affect the experiment so are kept
the same (eg. Room temperature)
Control experiment ­ an experiment done to prove that the thing you are
changing really does affect the result.
Reliability ­ how accurate your results are compared to others.…read more


No comments have yet been made

Similar Other resources:

See all Other resources »See all resources »