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Reproduction in Organisms Test - 42

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Reproduction in Organisms Test - 42
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  • Question 1
    1 / -0
    Hysterical pregnancy is also known as
    Solution
    • Hysterical pregnancy is the appearance of signs and symptoms associated with pregnancy when the person is not actually pregnant.
    • It is also known as false pregnancy, phantom pregnancy, pseudopregnancy or pseudocyesis, 
    • False pregnancy may sometimes be purely psychological.
    • So, the correct option is 'All of the above'.
  • Question 2
    1 / -0
    A female dog is 
    Solution
    Estrous cycle comprises of the recurring physiologic changes that are induced by reproductive hormones in females of mammals. Monoestrous means having one estrous cycle per year. Diestrous means having two estrous cycles per year. Polyestrous means having many estrous cycles per year. A female dog is an example of diestrous. 
    Thus, the correct answer is option B.
  • Question 3
    1 / -0
    The female cat stays in heat for
    Solution
    • Estrus is the period in the sexual cycle of female mammals, except the higher primates, during which they are in heat—i.e., ready to accept a male and to mate.
    • The female cat stays in heat for 14-21 days i.e. it is ready to mate for this duration.
    • So, the correct option is '14-21 days'.
  • Question 4
    1 / -0
    Estrus frequency of a goat is 
    Solution
    Estrous cycle is the reproductive cycle seen in non-primates female. It is the time from one heat period (estrous) to another heat period (estrous). This time period can vary from one species to another species. In goat the estrus frequency is of 21 days. So, the correct option is D.
  • Question 5
    1 / -0
    The second half of the estrus cycle is controlled by
    Solution
    The reproductive cycle of the non-primate females is called oestrous 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 A.
  • Question 6
    1 / -0
    Monoestrous  and diestrous can be differentiated by
    Solution
    On the basis number of estrous cycle (breeding cycle), females of some species can be monoestrous and diestrous. Monoestrous animals are those in which only one estrous cycle can be seen in a year. For example, dogs, fox etc. Whereas, diestrous animals are those in which two estrous cycles are seen in a year. For example, horse, goats etc. So, the correct option is A.
  • Question 7
    1 / -0
    Which of the following hormone regulates anestrus?
    Solution
    The reproductive cycle of the non primate females is called estrous cycle. The phase when the female is sexually receptive is called as estrus and the phase when the female is not sexually receptive is called as anestrus. When the pineal gland is exposed to light, there is release of the hormone melatonin. The hormone causes stimulation and repression of reproduction in different kind of breeders. This hormone regulated the activity and the release of GnRH (gonadotropin releasing hormone).
    Thus, the correct answer is option B. 
  • Question 8
    1 / -0
    Which hermaphrodite exhibits self-fertilization?
    Solution
    Hermaphrodites are the organisms which possess both the male and the female reproductive systems in the same body. The tapeworms are the example of hermaphrodites which can perform self-fertilization. The male gamete can fertilize the female gamete in the same organism. The earthworms are hermaphrodites which perform cross-fertilization. The frog and snakes generally show sexual dimorphism, different sexes.
    Thus, the correct answer is option B. 
  • Question 9
    1 / -0
    Which of the following possess both ovaries and testes?
    Solution
    Bisexual animals, also called as hermaphrodites are the organism having reproductive organs normally associated with both male and female sexes. Many invertebrates and a significantly smaller number of vertebrates are hermaphrodites. Examples of Hermaphrodites are : 
    Snails:- Most snails are hermaphrodites. The only exceptions include certain freshwater and marine species, such as apple snails and periwinkle snails.
    Echinoderms:- Echinoderms are marine invertebrates. They include sea stars, sea cucumbers, sea urchins and sand dollars. Some of the most well-known echinoderms are also hermaphrodites.
    Worms:- Another class of invertebrates, worms, adds to the proliferation of hermaphroditism. Some worms can fertilize themselves, but for the most part, worms need a mate to reproduce.
    Fishes:- Around 21 families of fish are natural hermaphrodites. Some of the unique hermaphroditic vertebrates include snook, clown fish, wrasse, angelfish, grouper, goby, parrot fish, sea bass, starfish and anthias.
  • Question 10
    1 / -0
    Starfish is
    Solution
    Bisexual animals, also called as hermaphrodites are the organism having reproductive organs normally associated with both male and female sexes. Many invertebrates and a significantly smaller number of vertebrates are hermaphrodites. Echinoderms are marine invertebrates. They include sea stars, sea cucumbers, sea urchins and sand dollars. Some of the most well-known echinoderms are also hermaphrodites. Thus, the correct answer is option B.
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