Read the graph given below and correlate the uterine events that take place according to the hormonal levels. (a) (i) 6-15 days (ii) 16-25days (iii) 26-28 days (if the ovum is not fertilised) (b) Specify the sources of the hormones mentioned in the graph.

(a) The Uterine events according to the hormonal levels of the days given below are as follows: (i) 6-15 days: Estrogen initially increases and then decreases but progesterone remains constant. This is the follicular phase, where FSH from the pituitary stimulates ovarian follicles to secrete estrogen which in turn stimulates the development and thickening of endometrium of uterine wall. (ii) 16 – 25 days: Progesterone increases but Estrogen remains constant. Secretion of progesterone maintains endometrium which is necessary for implantation of a fertilized ovum or other events of pregnancy. (iii) 26 – 28 days: Progesterone decreases and Estrogen increases. When fertilization does not take place, the endometrial lining disintegrates leading to menstruation and thus marking the new cycle. (b) The sources of hormones mentioned in the graph are: (i) Estrogen is secreted by the growing follicles. (ii) Progesterone is secreted Corpus Luteum.

E M B I B E

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 3 - Human Reproduction>TEST QUESTIONS>Q 4

MEDIUM

12th CBSE

IMPORTANT

Earn 100

What is spermatogenesis? Briefly describe the process of spermatogenesis.

Important Questions on Human Reproduction

MEDIUM

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 3 - Human Reproduction>TEST QUESTIONS>Q 5

Briefly describe the human female reproductive system with suitable diagram?

MEDIUM

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 3 - Human Reproduction>TEST QUESTIONS>Q 6

Define gametogenesis ? Name two types of gametogenesis. Give a schematic representation of spermatogenesis in humans.

MEDIUM

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 3 - Human Reproduction>TEST QUESTIONS>Q 7

Draw a diagrammatic sectional view of the human ovary to show the development of follicles and ovulation. Label the different stages in the diagram.

EASY

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 3 - Human Reproduction>TEST QUESTIONS>Q 7

Why are the human testes situated in the scrotum outside the abdomen?

MEDIUM

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 3 - Human Reproduction>TEST QUESTIONS>Q 8

Explain the process of fertilisation of an ovum and the events that follow till implantation in a human female?

MEDIUM

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 3 - Human Reproduction>TEST QUESTIONS>Q 9

What are foetal membranes? Give their names. Mention the function of each membrane.

MEDIUM

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 3 - Human Reproduction>TEST QUESTIONS>Q 10

(a) Mention the events that induce the completion of the meiotic division of the secondary oocyte.
(b) Trace the journey of the ovum from the ovary, its fertilisation and further development until the implantation of the embryo.

MEDIUM

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 3 - Human Reproduction>TEST QUESTIONS>Q 11

Read the graph given below and correlate the uterine events that take place according to the hormonal levels.

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