Flashcards
B2.2 Flashcards
Flashcards do conjunto (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
Informações
- Descrição
- GCSE Biology (Unit 2) FlashCards sobre B2.2 Flashcards, criado por Mel Hughes em 25-08-2016.
- Criado por
- Mel Hughes
- Visualizações
- 17
- Avaliação