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Question 17N.2.SL.TZ0.b

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Date November 2017 Marks available [Maximum mark: 8] Reference code 17N.2.SL.TZ0.b
Level SL Paper 2 Time zone TZ0
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 8]
17N.2.SL.TZ0.b

Reproduction in eukaryotes can be sexual or asexual.

Explain how hormones are used to control the human menstrual cycle.

[8]

Markscheme

a. FSH stimulates the development of follicles

b. follicles produce estrogen

c. estrogen stimulates the repair of the uterus lining

d. estrogen stimulates LH secretion

e. LH causes/stimulates ovulation

f. LH causes/stimulates the development of the corpus luteum

g. corpus luteum secretes progesterone

h. progesterone causes/stimulates thickening of the uterus lining

    OR

    prepares uterine lining for implantation

    OR

    maintains the endometrium

i. progesterone/estrogen inhibits the secretion of LH/FSH

j. falling progesterone levels at the end of the cycle allow FSH production/menstruation

k. negative/positive feedback «control» described correctly

l. LH/FSH are pituitary hormones

[Max 8 Marks]

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