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21. How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?

Dogs are polyovulatory animals and they release more than one egg at a particular time. So, a female dog with 6 puppies in one generation, releases 6 eggs. 

20. How many eggs are released by a human ovary in a month? How many eggs do you think would have been released if the mother gave birth to identical twins? Would your answer change if the twins born were fraternal?

One ovum is released by a human ovary in a month. Identical twins are developed from a single egg. Hence, only one egg would have been released when the mother gave birth to identical twins. If the twins are fraternal twins then they must have been developed from two eggs

Q19.     In our society the women are often blamed for giving birth to daughters. Can you explain why this is not  correct?

The sex chromosome in human female is XX while in a male it is XY. Thus, female produces haploid gametes having all X chromosomes but male produces two types of gametes with either X or Y.  The sex of the child will be dependent on which sperm whether the one with X chromosomes or the one with Y chromosome fertilises the ovum with X chromosome.  Therefore, the sex of the baby is determined by...

18.  What is parturition? Which hormones are involved in induction of parturition?

The process of delivery of the foetus is called parturition. Oxytocin hormone causes a strong contraction of uterine. Contraction of uterine becomes stronger and stronger by the stimulatory reflex between uterine contraction and oxytocin secretion. This leads to the expulsion of the baby out of the uterus through the birth canal

17. What is menstrual cycle? Which hormones regulate menstrual cycle?

Menstrual cycle: The reproductive cycles in female primates is called the menstrual cycle. In a 28 days menstrual cycle, the menses takes place on cycle days 3-5. The menstrual cycle consists of phases like menstrual phase, follicular phase, ovulatory phase and luteal phase. Menstrual phase 1. The production of LH from the anterior lobe of the pituitary gland is reduced. 2. The withdrawal of...

16. Identify True/False statements. Correct each false statement to make it true.

            (g) Presence or absence of hymen is not a reliable indicator of virginity or sexual experience. (True/False)

Presence or absence of hymen is not a reliable indicator of virginity or sexual experience. (True)

16. Identify True/False statements. Correct each false statement to make it true.

          (f) Menstrual cycle ceases during pregnancy

Menstrual cycle ceases during pregnancy. (True)

16. Identify True/False statements. Correct each false statement to make it true.

               (e)  Oogenesis takes place in corpus luteum. (True/False)

Oogenesis takes place in corpus luteum. (False) Oogenesis takes place in ovary

16. Identify True/False statements. Correct each false statement to make it true.

         (e)   Leydig cells synthesise androgens. (True/False)

Leydig cells synthesis androgens (true)

 

16.Identify True/False statements. Correct each false statement to make it true.

          (c)  Leydig cells are found in ovary. (True/False)

Leydig cells are found in ovary. (False) Leydig cells are found in seminiferous tubules of testis

16. Identify True/False statements. Correct each false statement to make it true.

            (b) Spermatozoa get nutrition from Sertoli cells. (True/False)
 

Spermatozoa get nutrition from Sertoli cells. (True)

16. Identify True/False statements. Correct each false statement to make it true.

            (a) Androgens are produced by Sertoli cells. (True/False)

Androgens are produced by Sertoli cells. (False).  Androgens are produced by Leydig's cells

15. Name the functions of the following

                       (e) Fimbriae

Fimbriae- After ovulation, it helps in the collection of the ovum.

15. Name the functions of the following

            (d)    Sperm tail

Sperm tail-  It provides motility to sperms.

15. Name the functions of the following

            (c)    Acrosome

  Acrosome - It is filled with enzymes that hydrolyse egg membrane thus, helping the sperm in penetration of ovum during fertilisation of the ovum.

15 . Name the functions of the following

         (b)   Endometrium

Endometrium- Implantation of the fertilized ovum and many events of pregnancy takes place in the endometrium.

15.     Name the functions of the following:

              Corpus luteum

   Corpus luteum-  It secretes progesterone. Progesterone is essential for the maintenance of endometrium.

 14. Draw a labelled diagram of a Graafian follicle?

Diagram of Graffian follicle

13. Draw a labelled diagram of a section through ovary.

A labelled diagram of a section through the ovary is as follows: 

12. What is oogenesis? Give a brief account of oogenesis.

The process of formation of mature female gametes is called oogenesis. It starts during embryonic development stage when millions of oogonia (gamete mother cells) are formed in each fetal ovary. The gamete mother cells start division and enter into prophase-I of meiotic division and get temporally arrested. At this stage, they are called primary oocytes. Each primary oocyte gets surrounded by a...
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