Скачать или смотреть 2021 KCSE BIOLOGY PAPER 2 QUESTION 7

This video explains how to arrive at the correct answer for Question 7 in KNEC's 2021 KCSE Biology Paper 2 Exam.

The table below shows the varying concentration of two hormones, progesterone and luteinizing hormone, determined at seven-day intervals during the human menstrual cycle.

a. On the same axis, draw graphs of concentration of hormones against time.(8 marks)
b.
i. Name the physiological process taking place when the concentration of luteinizing hormone is highest. (1 mark)
ii. State the significance of the process named in 6 (b) (i). (1 mark)
c.
i. Determine the concentration of progesterone hormone at which the endometrium is thickest. (1 mark)
ii. Explain your answer in 6(c)(i). (1 mark)
d. State two roles of progesterone hormone in humans. (2 marks)
e. Name two sites where progesterone hormone is produced in the human body. (2 marks)
f. Name another hormone, apart from the luteinizing hormone, that inhibits the secretion of progesterone hormone. (1 mark)
g.
i. Predict the concentration of progesterone hormone seen days after the study period if fertilisation did not take place. (1 mark)
ii. Give a reason for your answer in 6(9)(i). (1 mark)
h. Name the part of the human body where the luteinizing hormone is produced. (1 mark)