Short Answer TypeWrite the function of each one of the following:
(a) (Oviducal) Fimbriae
(b) Coleoptile
(c) Oxytocin
Long Answer TypeThe following is the illustration of the sequence of ovarian events (a to i) in a human female.
i) Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents.
(ii) Name the ovarian hormone and the pituitary hormone that have caused the above mentioned event.
(iii) Explain the changes that occur in the uterus simultaneously in anticipation.
(iv) Write the difference between c and h.
(v) Draw a labeled sketch of the structure of a human ovum prior to fertilization.
How does the megaspore mother cell develop into 7-celled, 8 nucleate embryo sac in an angiosperm? Draw a labeled diagram of a mature embryo sac.
(a) Draw a labelled diagram of the human female reproductive system.
(b) Enumerate the events in the ovary of a human female during:
(i) Follicular phase
(ii) Luteal phase of menstrual cycle
(a) Write the specific location and the functions of the following cells in human males:
(i) Leydig cells
(ii) Sertoli cells
(iii) Primary spermatocyte
(b) Explain the role of any two accessory glands in human male reproductive system.
(a) (i) Leydig cell are found adjacent to the seminiferous tubules in the testes. They synthesize and secrete testicular hormones called androgens (testosterone).
(ii) Sertoli cells are found in the seminiferous tubules. They act as nurse cell and provide nutrition to the male germ cells.
(iii) Primary spermatocytes are present in the testes. They are diploid cells that are derived from the spermatogonia. They undergo meiotic division to give rise to secondary spermatocyte and thereby male gamete-sperm.
(b) The male accessory glands include the seminal vesicles, prostate gland, and the bulbourethral glands whose secretions constitute the seminal plasma, which provides energy and motility to the sperms until they reach the ovum.
Prostate Gland: It stores and secretes an alkaline, milky fluid known as pre-ejaculate. The purpose of the alkalinity of the semen is to neutralize the acidity of the vaginal tract.
Bulbourethral glands: This gland secretes a viscous secretion during sexual arousal. This fluid helps to lubricate the urethra for easy passage of spermatozoa to pass through, and to help flush out any residual urine or foreign matter.
Short Answer TypeWhy are the human testes located outside the abdominal cavity? Name the pouch in which they are present.
Long Answer Type(a) Where does fertilization occur in human ? Explain the events that occur during this process.
(b) A couple where both husband and wife are producing functional gametes, but the wife is still unable to conceive, is seeking medical aid. Describe any one method that you can suggest to this couple to become happy parents.Short Answer TypeHow is the entry of only one sperm and not many ensured into an ovum during fertilisation in humans?
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