Biology: Chapter 2 (p2)

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Describe the four stages of the Menstrual Cycle?
Stage 1: Is day 1 when the bleeding starts. Stage 2: Ready to receive a fertilised egg. Stage 3: An egg is developed and then released from the ovary at day 14. Stage 4: The wall is maintained for 14 days, if no egg the cycle
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What three hormones control the different stages of the Menstrual Cycle?
Oestrogen, FSH and LH
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What is the two function of FSH?
1) To mature an egg. 2) Stimulates the ovaries to produce oestrogen
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What part of the body secretes FSH?
It is produced by the pituitary gland
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What are the two function of Oestrogen?
1) Stimulates the pituitary gland to produce LH. 2) Inhibits the further releases of FSH
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What part of the body secretes oestrogen?
It is produced by the ovaries
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What is the function of LH?
1) To release the mature egg
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What part of the body secretes LH?
It is produced by the pituitary gland
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What ithe function of progesterone?
It maintains the lining of the uterus
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What part of the body secretes progesterone
It is produced in the ovary
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How can oestrogen be used to stop fertility?
It can be used to prevent the release of an egg by inhibiting the release of FSH; so no eggs mature
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What do oral contraceptives contain to prevent egg maturation?
Oestrogen and progesterone
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What 3 environmental changes are plants sensitive to?
Light, moisture & gravity
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What is auxin?
Auxin is a plant hormone that controls growth
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Where is auxin made in a plant?
It is made in the tips of the plants
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Where do shoots grow towards?
Grows towards the light (phototropism)
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What do shoots grow away from?
Grows against the force of gravity (gravitropism)
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What does auxin do in shoots?
It increases the growth in shoots
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Where do roots grow towards?
Grows in the direction of the force of gravity (gravitropism) Allow: moisture
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What do roots grow away from?
Grow away from light (phototropism)
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What shade of the shoot contains more auxins and why?
The shaded side; as it causes the shaded side to grow longer to bend towards the light
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What shade of the roots contain more auxins and why?
The shaded side contains less auxins; so this side grows less so it grows away from the light
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Why are growth hormones are used to make selective weedkillers?
Selective weeds are made of plant hormones, which only affect broad-leaved plant. They kill the weeds but leave the crops untouch
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What is rooting powder and why is it used?
Rooting powder contains the growth hormone auxin; to increase root growth
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Card 2

Front

What three hormones control the different stages of the Menstrual Cycle?

Back

Oestrogen, FSH and LH

Card 3

Front

What is the two function of FSH?

Back

Preview of the front of card 3

Card 4

Front

What part of the body secretes FSH?

Back

Preview of the front of card 4

Card 5

Front

What are the two function of Oestrogen?

Back

Preview of the front of card 5
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