6128850
Description
Flashcards by Mel Hughes, updated more than 1 year ago
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Created by Mel Hughes
over 8 years ago
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| Question | Answer |
| Where does the energy for photosynthesis come from? | Sunlight, although artificial light can also be used in experiments |
| Why do enzyme reactions slow down? | When the temperature falls the enzymes work slower |
| What is meant by the term 'dependant variable? | The variable that is being measured -the measurement depends on what is done with independent variable |
| Name three substances used for storage in plants | Starch, fats and oils |
| What factors must be controlled in a greenhouse to improve plant growth? | Light, temperature and carbon dioxide |
| Why 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 |
| What is a quadrat? | A square frame which may be divided into a grid |
| How can you make sure an investigation is valid? | Only the independent variable should affect the results, all other variables must be controlled |
| Name the solution used to test a leaf for starch | Iodine solution |
| What is the result of the iodine test for starch? | The regions containing starch will turn blue-black. Regions without starch will look yellowy-brown |
| What is the word equation for photosynthesis? | Carbon dioxide + Water -> Glucose + Oxygen |
| Give three physical factors which affect the distribution of plants | Three of: Temperature, availability of nutrients, water, oxygen, carbon dioxide, amount of water |
| Why 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 |
| What 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 |
| How 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 |
| What 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. |
| Why is the difficult to be sure an investigation in outdoor habitats is valid? | There are so many variables which are difficult to control |
| What 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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