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17 Cards in this Set
- Front
- Back
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What are the 4 stages of the menstrual cycle? |
1) Day 1 to 4 is when uterus lining breaks down 2) Day 4 to 14 is when the lining of the uterus builds up again 3) Day 14 is when the egg is released 4) Wall is maintained for 14 days and if no fertilised egg lands on the wall by day 28, the process starts again |
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What does FSH do? |
1) Causes egg mature 2) Stimulates ovaries to produce oestrogen |
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What does oestrogen do? |
1) Causes LH to be produced 2) Stops FSH being produced |
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What does LH do? |
1) Causes egg release |
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What does progesterone do? |
Produces a thick cervical mucus which prevents sperm fertilising an egg |
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What 2 hormones does 'the pill' contain? |
1) Oestrogen 2) Progesterone |
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What are the 2 advantages of 'the pill'? |
1) Over 99% efficient at preventing pregnancy 2) Reduces risk of some cancer types |
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What are the disadvantages of 'the pill'? |
1) Still a chance of pregnancy 2) Some side effects 3) Doesn't protect STDs |
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What is IVF? |
IVF is where a woman is given FSH and LH so she produces eggs. They are then fertilised in a lab and the eggs are transferred to the woman's uterus |
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What are the disadvantages of IVF? |
1) Some people have strong reactions to the hormones 2) Some reports of an increased cancer risk 3) Multiple births |
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What is auxin? |
It's a hormone that controls growth in plants |
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Auxin controls plant growth in response to... |
1) Light (Phototropism) 2) Gravity (Gravi/Geotropism) 3) Moisture |
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Where is auxin produced? |
In the tips of shoots and roots |
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What happens when a shoot tip is exposed to light? |
There is more auxin on the side in the shade so the cells on this side grow faster. This causes the shoot to bend towards the light |
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What happens when a shoot is growing sideways? |
There is more auxin on the lower side so this side grows faster. This causes the shoot to grow away from gravity |
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How is auxin different in the roots? |
In the roots it's the opposite to in the shoots |
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How can clones of plants be made? |
Cuttings can be taken and put in a rooting powder which contains auxin so roots produce rapidly and start growing as new plants |
