Describe the roles of pituitary and ovarian hormones during the

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 Multiple Choice QuestionsShort Answer Type

111.

Write the function of each one of the following:

(a) (Oviducal) Fimbriae

(b) Coleoptile

(c) Oxytocin
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 Multiple Choice QuestionsLong Answer Type

112.

The following is the illustration of the sequence of ovarian events (a to i) in a human female.



i) Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents.

(ii) Name the ovarian hormone and the pituitary hormone that have caused the above mentioned event.

(iii) Explain the changes that occur in the uterus simultaneously in anticipation.

(iv) Write the difference between c and h.

(v) Draw a labeled sketch of the structure of a human ovum prior to fertilization.

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113.

How does the megaspore mother cell develop into 7-celled, 8 nucleate embryo sac in an angiosperm? Draw a labeled diagram of a mature embryo sac.

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114.

(a) Draw a labelled diagram of the human female reproductive system. 

(b) Enumerate the events in the ovary of a human female during: 

(i) Follicular phase

(ii) Luteal phase of menstrual cycle

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115.

(a) Write the specific location and the functions of the following cells in human males:

(i) Leydig cells

(ii) Sertoli cells

(iii) Primary spermatocyte

(b) Explain the role of any two accessory glands in human male reproductive system.

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116. Describe the roles of pituitary and ovarian hormones during the menstrual cycle in a human female.


Menstrual cycle is the reproductive cycle in all primates and begins at puberty (menarche). In human females, menstruation occurs once in a month (in about 28 to 29 days). The cycle of events, starting from one menstruation till the next is called the menstrual cycle. Following are the changes that are brought about by ovarian and pituitary hormones.




  • The cycle starts with the menstrual phase, where the menstruation occurs. This is followed by the follicular phase. In this phase, the primary follicles mature into the Graafian follicles and the release of gonadotropins (LH and FSH) also increases. This causes follicular growth and the growing follicles produce oestrogen.
  • The LH and FSH are at their peak in the middle of the cycle (14th day) and cause the rupture of the Graafian follicles to release the ovum. This phase is called the ovulatory phase.
  • The remains of the Graafian follicles get converted into the corpus luteum that secretes progesterone for the maintenance of the endometrium.
  • In the absence of fertilisation, the corpus luteum degenerates; thereby, causing the disintegration of the endometrium and the start of a new cycle.
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 Multiple Choice QuestionsShort Answer Type

117.

Why are the human testes located outside the abdominal cavity? Name the pouch in which they are present.

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 Multiple Choice QuestionsLong Answer Type

118.

(a) Where does fertilization occur in human ? Explain the events that occur during this process.

(b) A couple where both husband and wife are producing functional gametes, but the wife is still unable to conceive, is seeking medical aid. Describe any one method that you can suggest to this couple to become happy parents.
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 Multiple Choice QuestionsShort Answer Type

119.

How is the entry of only one sperm and not many ensured into an ovum during fertilisation in humans? 

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120.

Where is acrosome present in humans? Write its function

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