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Asexual Reproduction

Which of the ...

Question

Which of the following statement can be related to the reproductive cycle of a rat?

A

Ovulation is spontaneous.

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B

Fully functioning corpus luteum is formed after coitus stimulation.

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C

The length of the reproductive cycle is 190 days.

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D

Both A and B

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Solution

The correct option is D Both A and B
The reproductive cycle is also called the estrous cycle. The estrous cycle in the rat is polyestrous i.e. more than one estrous cycle during a specific yearly time, with approximately 12 hours of an estrous period. Ovulation is spontaneous in rats and fully functioning corpus luteum is formed after coitus stimulation.
So, the correct answer is 'Both A and B'.

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Q. Corpus luteum is produced during the phase of the menstrual cycle.

Q. How and at what stage of menstrual cycle is corpus luteum formed in human females? When does it regress?

Q. Below is given the unorganised list of some important events in the human female reproductive cycle. Identify the correct sequence of these event and select the correct option.
(i) Secretion of FSH
(ii) Growth of corpus luteum
(iii) Growth of the follicle and oogenesis
(iv) Ovulation
(v) Sudden increase in levels of LH

Q. Refer to the given schematic representation of menstrual cycle showing three phases I, II and Ill.

Select the option that correctly matches these phases with the following events.

(i) FSH secreted by the anterior pituitary stimulates the ovarian follicle to secrete estrogen which stimulates the proliferation of the endometrium.

(ii) LH secreted by the anterior pituitary stimulates the development of corpus luteum which secretes progesterone.

(iii) Reduced production of LH from anterior pituitary causes degeneration of corpus luteum, thereby progesterone production is reduced.

Q. Read the given passage and answer the question below.

The reproductive cycle, in female primates, called the menstrual cycle, comprises 28 days in a healthy female. Primata is the order to which monkeys, apes and human beings belong. The duration of the menstrual cycle varies in different females as it is dependent upon a number of factors. However, the average duration amounts to around 28 days.

Which of the following is the correct sequence of menstrual cycle?
[1 mark]

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