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Reproduction in Organisms Test - 41

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Reproduction in Organisms Test - 41
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  • Question 1
    1 / -0
    Which of the following is known as "period of heat"?
    Solution
    The reproductive cycle of the non primate females is called estrous cycle. For example, in rats, horse etc. It can be divided into four phases proestrus, estrus, metestrus and diestrus. Proestrus stage is the building up phase. The ovarian follicle becomes large and secretes estrogen which is necessary for the preparation of estrus and pregnancy. Estrus is the phase when ovulation takes place. It is also known as the period of heat and female is sexually receptive. Metestrus is the phase where corpus luteum forms under the influence of decreased estrogen and increased progesterone level. Diestrus is the phase where corpus luteum becomes functional and the progesterone level increases. So, the correct option is C.
  • Question 2
    1 / -0
    Ovulation occurs in which of the following stages of an estrous cycle?
    Solution
    The reproductive cycle of the non primate females is called estrous cycle. For example, in rats, horse etc. It can be divided into four phases proestrus, estrus, metestrus and diestrus. Proestrus stage is the building up phase. The ovarian follicle becomes large and secretes estrogen which is necessary for the preparation of estrus and pregnancy. Estrus is the phase when ovulation takes place. It is also known as the period of heat and female is sexually receptive. Metestrus is the phase where corpus luteum forms under the influence of decreased estrogen and increased progesterone level. Diestrus is the phase where corpus luteum becomes functional and the progesterone level increases. So, the correct option is B.
  • Question 3
    1 / -0
    The resting interval is short in 
    Solution
    The estrous cycle consists of the physiologic changes that are induced by the reproductive hormones in mammals in females. The polyestrous cycle is seen in some animals, where they have many estrous cycles per year. Due to animals undergo go into heat several times a year during the breeding season, the resting interval is very short.  A rabbit, cat, cow are examples of polyestrous. 
    Thus, the correct answer is option B.
  • Question 4
    1 / -0
    Which of the following statement can be related to proestrus phase of an estrus cycle?
    Solution
    The reproductive cycle of the non primate females is called estrous cycle. For example, in rats, horse etc. It can be divided into four phases proestrus, estrus, metestrus and diestrus. Proestrus stage is the building up phase. The ovarian follicle becomes large and secretes estrogen which is necessary for the preparation of estrus and pregnancy. Swelling in vulva and vagina can be noticed which indicates the preparation of sexual receptivity. The glands of uterus show hypertrophy due to the heat. Estrus is the phase when ovulation takes place. It is also known as the period of heat and female is sexually receptive. Metestrus is the phase where corpus luteum forms under the influence of decreased estrogen and increased progesterone level. Diestrus is the phase where corpus luteum becomes functional and the progesterone level increases. So, the correct option is D.
  • Question 5
    1 / -0
    The estrus cycle can be divided into how many phases?
    Solution
    The reproductive cycle of the non-primate females is called estrous cycle. For example, in rats, horse etc. It can be divided into four phases proestrus, estrus, metestrus and diestrus. Proestrus stage is the building up phase. The ovarian follicle becomes large and secretes estrogen which is necessary for the preparation of estrus and pregnancy. Estrus is the phase when ovulation takes place. In this phase, female is sexually receptive. Metestrus is the phase where corpus luteum forms under the influence of decreased estrogen and increased progesterone level. Diestrus is the phase where corpus luteum becomes functional and the progesterone level increases. So, the correct option is B.
  • Question 6
    1 / -0
    Which of the following is considered as resting phase according to the sexual point of view?
    Solution
    • The first phase (proestrus) of the estrous cycle is the building-up phase. During this phase the ovarian follicle (under the influence of FSH and LH) enlarges and begins to secrete estrogens.
    • The end of sexual receptivity marks the beginning of metestrus, the post-ovulatory phase dominated by corpus luteum function. 
    • Anestrus is a state or interval of sexual inactivity between periods of activity in periodically breeding mammals.
    • So, the correct option is 'Anestrus'.
  • Question 7
    1 / -0
    In which of the following phase of the estrus cycle, the female receives the male gamete?
    Solution
    • The reproductive cycle of the non-primate females is called the estrous cycle. For example, in rats, horses etc. 
    It can be divided into four phases - proestrus, estrus, metestrus, and diestrus.
    • Proestrus stage is the building up phase. The ovarian follicle becomes large and secretes estrogen which is necessary for the preparation of estrus and pregnancy. 
    • Estrus is the phase when ovulation takes place. It is also known as the period of heat and female is sexually receptive (can receive the male gamete).
    • Metestrus is the phase where the corpus luteum forms under the influence of decreased estrogen and increased progesterone levels. 
    • Diestrus is the phase where the corpus luteum becomes functional and the progesterone level further increases. 

    So, the correct option is B.
  • Question 8
    1 / -0
    Estrous cycle is interrupted by :
    Solution
    • Anestrus is a state or interval of sexual inactivity between periods of activity in periodically breeding mammals.
    • The first phase (proestrus) of the estrous cycle is the building-up phase. During this phase the ovarian follicle (under the influence of FSH and LH) enlarges and begins to secrete estrogens.
    • The end of sexual receptivity marks the beginning of metestrus, the post-ovulatory phase dominated by corpus luteum function. 
    • So, the correct option is 'Anestrus'.
  • Question 9
    1 / -0
    The first half of the estrus cycle is regulated by
    Solution
    The reproductive cycle of the non primate females is called estrous cycle. For example, in rats, horse etc. It can be divided into four phases proestrus, estrus, metestrus and diestrus. Proestrus stage is the building up phase. The ovarian follicle becomes large and secretes estrogen which is necessary for the preparation of estrus and pregnancy. Estrus is the phase when ovulation takes place. It is also known as the period of heat and female is sexually receptive (can receive the male gamete). This phase is also regulated by the estrogen. Metestrus is the phase where corpus luteum forms under the influence of decreased estrogen and increased progesterone level. Diestrus is the phase where corpus luteum becomes functional and the progesterone level increases. 
    So, the correct option is B. 
  • Question 10
    1 / -0
    The estrus frequency of cow is
    Solution

    • Estrus cycle is the period of sexual activity in female mammals except for higher mammals, during which they are in heat i.e. ready to mate.
    • Cows can go into heat several times per year.
    • Estrus frequency of cow is 21 days i.e. it goes into heat with a duration of 21 days.
    • So, the correct option is '21 days'.
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