Karteikarten
B2.2 Flashcards
Karten in diesem Stapel (18)
- 1Where does the energy for photosynthesis come from?Sunlight, although artificial light can also be used in experiments
- 2Why do enzyme reactions slow down?When the temperature falls the enzymes work slower
- 3What is meant by the term 'dependant variable?The variable that is being measured -the measurement depends on what is done with independent variable
- 4Name three substances used for storage in plantsStarch, fats and oils
- 5What factors must be controlled in a greenhouse to improve plant growth?Light, temperature and carbon dioxide
- 6Why are there so few animals living in very cold regions such as the Arctic?Very few plants grow there -those that do are very small, so there is little food for animals
- 7What is a quadrat?A square frame which may be divided into a grid
- 8How can you make sure an investigation is valid?Only the independent variable should affect the results, all other variables must be controlled
- 9Name the solution used to test a leaf for starchIodine solution
- 10What is the result of the iodine test for starch?The regions containing starch will turn blue-black. Regions without starch will look yellowy-brown
- 11What is the word equation for photosynthesis?Carbon dioxide + Water -> Glucose + Oxygen
- 12Give three physical factors which affect the distribution of plantsThree of: Temperature, availability of nutrients, water, oxygen, carbon dioxide, amount of water
- 13Why would there be little point in heating a greenhouse on a summer's day?It will be hot enough anyway, so it would be a waste of energy. The rate of photosynthesis may stop if the temperature becomes too high
- 14What is meant by the term 'limiting factor' in photosynthesis?Factors such as light, temperature and carbon dioxide, which might prevent the rate of photosynthesis increasing above a certain point
- 15How can you use a quadrat to make a line transect?A line is marked between two points and then the quadrat is placed at regular intervals along the line. The organisms in the quadrat are counted
- 16What is the difference between a mean and a median?The mean (average) is the total of all the readings divided by the number of readings. The median is the middle value of the range.
- 17Why is the difficult to be sure an investigation in outdoor habitats is valid?There are so many variables which are difficult to control
- 18What is meant by 'reproducible' results?A measurement is reproducible if the investigation is repeated by another person, or by using different equipment or techniques, and the same results are obtained
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- GCSE Biology (Unit 2) Karteikarten am B2.2 Flashcards, erstellt von Mel Hughes am 25/08/2016.
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- Mel Hughes
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