Topic 03-Reproduction

Question 1

Use of FSH(Follicle stimulating hormone)

Answer 1

1. Produced by the pituitary gland in the brain after menstruation
2. Stimulates a follicle to grow and increase in size

Question 2

Use of follicle

Answer 2

1. Develops into a mature ovum

2. Produces oestrogen

Question 3

Use of oestrogen

Answer 3

1. Secreted by follicle
2. Causes the uterus lining to thicken and prevents another egg from developing
3. Stimulates LH(Luteinising hormone)

Question 4

Use of LH(Luteinising hormone)

Answer 4

1. Causes the remainder of follicle cells to form yellow body(Corpus luteum)
   2.

Question 5

Uses of yellow body

Answer 5

Produces progesterone

Question 6

Use of progesterone

Answer 6

Causes the uterus lining to further thicken and prevents it from degenerating

Question 7

Conditions required for artificial propagation

Answer 7

1. Sterilised conditions
2. Sufficient supply of nutrients, oxygen and water
3. Growth hormones

Question 8

Process of artificial propagation

Answer 8

1. A growing tip is removed from the healthy parent plant
2. The growing tip is dipped in a sterilising fluid And cut into many small pieces
3. Each piece is placed in a test tube containing sterile agar jelly
4. Callus of lily cells is formed after six weeks and a small lily plant is formed after 6 months
5. The small lily plant is transferred to a large compost to grow

Question 9

Solutions to infertility

Answer 9

1. Taking pills containing FSH can promote ovulation in women
2. Taking pills to make the pituitary glands insensitive to oestrogen because it can inhibit the production of FSH—>prevent ovum from maturing
3. Artificial insemination(人工授精): Collecting sperms from a man and placing them via a fine plastic tube into the woman’s uterus
4. In vitro fertilisation. Fertilisation takes place out of the woman’s body. Embryo is placed in the woman’s uterus lining for implantation