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15. Give three reasons why.

16. State the source of the following hormones in the mammalian body:
(i) Follicle stimulating hormone
(ii) Luteinizing hormone
(iii) Progesterone hormone

7. Describe the role of hormones in the menstrual cycle. (20 marks)

3. Explain the process of fertilization in flowering plants. (20 marks)


Sagot :

Final answer:

The answer details the sources of specific hormones in the mammalian body and explains the key roles of hormones in the menstrual cycle and the process of fertilization in flowering plants.


Explanation:

Source of Hormones in the Mammalian Body:

  1. Follicle Stimulating Hormone (FSH): Source - Produced by the anterior lobe of the pituitary gland
  2. Luteinizing Hormone (LH): Source - Produced by the anterior lobe of the pituitary gland
  3. Progesterone Hormone: Source - Primarily produced by the ovaries during the menstrual cycle

Role of Hormones in Menstrual Cycle:

Hormones like estrogen, LH, and FSH play critical roles in the menstrual cycle. Estrogen helps build the uterine lining, LH triggers ovulation, and FSH stimulates the growth of follicles in the ovaries.

Process of Fertilization in Flowering Plants:

Fertilization in flowering plants involves the transfer of pollen grains to the stigma, followed by the growth of pollen tubes to the ovary, where fertilization occurs. This process leads to the formation of a zygote, which develops into a seed within the ovary.


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