Q25 of 42 Page 1

Explain the changes that occur in the ovary and uterus during menstrual cycle in human females. Mention the influence of pituitary and ovarian hormones in bringing these changes.

OR


Compare the characteristic features of insect pollinated and wind pollinated flowers. Explain how the respective features assist in pollination.



Menstrual phase:



Follicular phase:



Luteal phase:



Hormones in action:


Pituitary hormones: FSH and LH induce the follicular growth during the beginning of the cycle. A peak of LH leads to ovulation around the 14th day of the cycle.


Ovarian hormones: Estrogen repairs the endometrium and also causes the proliferation of the endometrium. Progestrone maintains the endometrim and prepares it for the implantation of the fertilized egg.


OR



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(b) It is said that vaccinations are a must for a healthy society. Justify.


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State the importance of emasculation and bagging in carrying out artificial hybridization.