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If pregnancy occurs due to fertilization...

If pregnancy occurs due to fertilization of ovum, corpus luteum persists for 9 months.

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Corpus luteum in pregnancy has a long life. However if fertilisation does not take place, it remains active only for 10-12 days. Explain.

Internal fertilization occurs in higher animals due to

(a) Draw a diagrammatic sectional view of the female reproductive system of human and label the parts (i) where the secondary oocytes develop (ii) which helps in collection of ovum after ovulation (iii) where fertilization occurs (iv) where implantation of embryo occurs. (b) Explain the role of pituitary and the ovarian hormones in menstrual cycle in human females.

Go through the following statement (i) Relaxin produced by the ovary, facilitates delivery of the foetus by softening the connective tissue of pubic symphysis and relaxing the pelvic ligaments and joints. (ii) By the end of fifth month of pregnancy, the foetus develops limbs and digits. (iii) Thalidomide is a teratogenic drug which causes a condition called phocomelia. (iv). Although the levels of prolactin are high during pregnancy, milk secretion does not occur because of the high oestrogen and progesterone levels which make the breast unresponsive to the prolactin. Which of these are correct?

The following is the illustration of the sequence of ovarian events (a - 1) in a human female. (a) Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents. (b) Name the pituitary hormone that has caused the above mentioned event. (c) Explain the changes that occur in the uterus simultaneously in anticipation (d) Write the differences between 'c and 'h'. (e ) Draw a labelled sketch of the structure of a human ovum prior to fertilization.