Quadrat Gcse Biology Coursework
SPECIMEN MATERIAL GCSE COMBINED SCIENCE: TRILOGY Higher Tier Paper 2: Biology 2H Specimen 2018 Time allowed: 1 hour 15 minutes Materials For this paper you must have: a ruler a calculator. Instructions Answer allquestions in the spaces provided. Do all rough work in this book. Cross through any work you do not want to be marked. Information There are 70 marks available on this paper. The marks for questions are shown in brackets. You are expected to use a calculator where appropriate. You are reminded of the need for good English and clear presentation in your answers. When answering questions 02.3 and 03.3 you need to make sure that your answer: ‒is clear, logical, sensibly structured ‒fully meets the requirements of the question ‒shows that each separate point or step supports the overall answer. Advice In all calculations, show clearly how you work out your answer. H Please write clearly, in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature
A transect is a line across a habitat or part of a habitat. It can be as simple as a string or rope placed in a line on the ground. The number of organisms of each species along a transect can be observed and recorded at regular intervals.
The distribution of organisms in a habitat is affected by the presence of other living organisms - such as herbivores or carnivores - that might eat them. It is also affected by abiotic factors, such as availability of light or water.
A kite diagram shows the number of animals (or percentage cover for plants) against distance along a transect.
In the example above, the distribution of dandelion plants gradually changes from five metres to 20 metres along the transect. A quadrat has been placed at regular intervals of a metre (or a few metres) along the transect.
A gradual change in the distribution of species across a habitat is called zonation. It can happen because of a gradual change in an abiotic factor.
A transect is usually used to investigate a gradual change in a habitat rather than to simply estimate the number of organisms within it.