Q. 24

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Answer :

(a): Viable seeds- are the seeds which have ability to germinate into a seedling under appropriate conditions.


(b)(i): Total number of pollen grains are 200 pollens, as each pollen carries two generative cells or male gametes and only one of the two are involved in zygote formation.


(b)(ii): Number of gametes: 600 gametes (400 male gametes and 200 female gametes)


400 gamete cells are required for production of 200 viable zygotes leading to formation of 200 guava seeds.


(c): Flow-chart depicting the Post-pollination events:



OR


(a): The sequence of the given hormones in pregnant women is: 1. FSH(Follicle stimulating hormone)


2. LH (Lutenizing hormone)


3. hCG( human chorionic gonadotropin)


4. Relaxin


(b): The sources and function of each hormone are as follows:



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