545836
Description
Flashcards by clairefindlay12, updated more than 1 year ago
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Created by clairefindlay12
almost 11 years ago
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| Question | Answer |
| BMI | A guide to whether someone is underweight, ideal weight of overweight BMI = mass in kg ÷ (height in m)2 |
| Diet | Balanced diet contains: Carbs Fats Proteins Minerals Vitamins Fibre Water |
| Proteins | Made of amino acids Each protein carries out a different function Types: Structural Hormone Carrier Molecule Enzyme |
| Digestion | Breakdown of carbs, proteins and fats into substances that can be absorbed into the blood |
| Fitness | Fitness is the ability to do physical activity You can measure fitness by Strength Stamina – endurance or staying Power Flexibility Agility Speed Cardiovascular efficiency |
| Health | Healthy people are free from disease and infection, but they may or may not be fit as well. It is possible to be fit but unhealthy, or healthy but unfit. |
| Weedkillers | Selective weedkillers kill some plants but not others. This can be useful for getting rid of dandelions in a lawn without killing the grass, or getting rid of thistles in a field without killing the wheat plants. The selective weedkiller contains growth hormone that causes the weeds to grow too quickly. The weedkiller is absorbed in larger quantities by the weeds than the beneficial plants |
| Rooting Powder | Rooting powder makes stem cuttings quickly develop roots. Rooting powder contains growth hormones. |
| Controlling fruit ripening | Some hormones slow the ripening of fruits and others speed it up. These hormones and their inhibitors are useful for delaying ripening during transport or when fruit is displayed in shops |
| Dormancy | Dormancy stops seeds germinating until conditions are ideal for growth. Hormones can be used to remove the dormancy of a seed so it can germinate at all times of year. Buds and flowers can also be naturally dormant. Hormones can also be used to make plants grow bushier, make them flower or control the growth of hedge plants. |
| Tropic responses | A 'tropism' is a growth in response to a stimulus. Positive tropism – towards the stimulus Negative tropism – away from the stimulus Phototropism – growth in response to the direction of light Geotropism – growth in response to the direction of gravity |
| Pyramids of biomass | |
| Pyramid of numbers | |
| Parasites | Parasites are organisms that live on or in a host organism. The parasite benefits from this arrangement, but the host suffers as a result |
| Mutualistic Relationships | In mutualism, both species benefit from their relationship |
| Depressants | depressants stop the next neurone sending nerve impulses – they bind to the receptor molecules it needs to respond to the neurotransmitter molecules. |
| Stimulants | Stimulants cause more neurotransmitter molecules to diffuse across the synapse |
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