Q 1. Arrange the following terms in the correct developmental sequence: Pollen grain, sporogenous tissue, microspore tetrad, pollen mother cell, male gametes.
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Explanation:

Pollen grain is the first cell of male gametophyte wherein male gamete develops. The correct sequence is sporogenous tissue, pollen mother cell, microspore tetrad, pollen grain and male gamete.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

when it is at an intermediate population density