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.
The nucleus of the functional megaspore mother cell divides mitotically to form two nuclei which move to the opposite poles, forming the 2-nucleate embryo sac. Subsequent mitotic nuclear divisions result in the formation of the 4-nucleate and later the 8-nucleate stages.
of the embryo sac. These mitotic divisions are strictly free nuclear in nature, that is, nuclear divisions are not followed immediately by cell wall formation. Among the eight nuclei, six are enclosed by cell walls and organised into cells, while the remaining two nuclei (called polar nuclei) are situated above the egg apparatus in a large central cell. Out of the six cells, three are grouped at the micropylar end, and constitute the egg apparatus out of which two are synergids and one egg cell. The other three cells are located at the chalazal end, and are called antipodals. All this leads to the organisation of the typical female gametophyte or embryo sac which is 8-nucleated and 7-celled.
(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.
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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