Biology- B5 Part E

1. ... is a gas produced by aging parts of plants. Controls cell division, stimulates enzymes for fruit to ripen, commercially it's used to speed up ripening (6)
4. Avoiding ... : Sterilisation- Cutting or tying fallopian tubes, Natural Methods- Finding out when the cycle occurs, Abstinence- don't have sex at all (9)
5. 4 hormones: Produced in ovaries by remains of follicle, Maintains lining of uterus in the second half of the cycle, Inhibits release of LH and FSH (12)
6. Plant hormones: ... controls growth near tips in roots and shoots. Controls growth of plant in response to light and gravity. Produced in tips, moves backwards to stimulate cell elongation which occurs in cells just behind tips. (5)
10. ... involves getting a womans egg and fertilising it with a mans sperm in a lab. +ive: Can give an infertile couple, a child. -ive: Multiple births can happen, success rate is low, the procedure can be emotionally and physically stressful, (3)

2. ... stimulates seed germination, stem growth and flowering. Used for: Controlling dormancy- seeds can germinate at different times of year with ... Inducing flowering- Flower without any changes to environment. Growing Larger Fruit (11)
3. ... is a hormone released by thyroid glands in the neck. Regulates metabolic rate when body is at rest. Stimulates protein synthesis for growth and development. Released in response to TSH which is released from pituitary gland. (9)
7. ... is a hormone released by adrenal glands which are just above the kidneys. Released in stressful or scary situations by brain sending nervous impulses. Gets the body ready for fight of flight, and increases supply of oxygen and glucose to cells (10)
8. ... can increase fertility. +ive: It helps woman become pregnant when they couldn't before. -ive: Doesn't always work, and too many eggs can be stimulated (8)
9. ... are non-hormonal ways of contraception which are designed to stop the sperm getting to the egg. Method include: Condoms- protect against STD's, Diaphragm- Uses spermicide to kill sperm, Spermicide- can be used alone but not as effective (8)

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