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Reproduction in Organisms Test - 67

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Reproduction in Organisms Test - 67
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  • Question 1
    1 / -0
    Vegetative Propagation by tuber occurs in
    Solution
    The vegetative parts of a potato tuber are buds or eyes. When buried in the soil, new plants develop from these buds.
    So the correct answer is option B.
  • Question 2
    1 / -0
    A small bulb like projection, which comes out of the yeast is called______.
    Solution
    • The small bulb-like projection coming out from the yeast cell is called a bud.
    • The bud gradually grows and gets detached from the parent cell and forms a new yeast cell. The new yeast cell grows, matures, and produces more yeast cells.
    • Sometimes, another bud arises from the bud forming a chain of buds. If this process continues, a large number of yeast cells are produced in a short time.
    • Thus the correct answer is option A.
  • Question 3
    1 / -0
    Match  column I (terms) with column II (examples)
    Column IColumn II
    a.Monoeciousi.Pheretima sps, Taenia sps
    b.Dioeciousii.Carica papaya, Phoenix dactylifera
    c.Hermaphroditesiii.Cocos sps, Cucurbita sps
    Solution
    Monoecious plants bear unisexual flowers on the same plant. Example: Cocos sps, Cucurbita sps, Zea mays  etc.
    Dioecious plants bear male and female reproductive structures on two distinct plants. So, here a plant is either staminate or pistillate.
    Example - Carica papaya, Phoenix dactylifera
    Hermaphrodites are bisexual animals, that is, they bear both male and female reproductive organs. Hence, they produce sperms/spermatozoa as well as the egg. However, it may not necessarily result in self-fertilization. 
    Example Pheretima sps, Taenia sps
    So, the correct answer is a-iii, b-ii, c-i
  • Question 4
    1 / -0
    Identify the organism that is correctly paired with its mode of reproduction and mode of fertilisation.
    Solution
    A. Shark viviparous internal fertilisation
    Solution: Certain types of Sharks like the bull shark, silvertip sharks etc are viviparous. The embryos are developed in the uterus and nourished by the placenta and live pups are given birth to after the gestation period.
    So the correct answer is " Shark viviparous internal fertilisation".
  • Question 5
    1 / -0
    In sexual reproduction, a male and female gametes fuse to form
    Solution
    The fusion of male and female gametes results in the formation of a zygote. This process of fusion is called fertilization. After fertilization, the zygote further develops into an embryo that forms a plant. 
    Thus the correct answer is option C. 
  • Question 6
    1 / -0
    In which of the following organism, testes descends into scrotum in breeding season but in non-breeding season goes up?
    Solution
    In all mammals, the testes descend into the scrotum, which is outside the body cavity. Scrotum maintains the temperature 1-3 $$^0$$C lower than the body temperature which is necessary for sperm production. In bats, the testes descend only during the mating or breeding season for sperm production but in the nonbreeding season it goes up as there is no requirement of sperm.
    Therefore, the correct answer is option D.
  • Question 7
    1 / -0
    A hatching egg of chick is covered by plaster of paris. It is harmful for 
    Solution
    Egg of the chick is porous, which allows the exchange of oxygen and carbon dioxide between the inside of the egg and the environment. If it is covered by plaster of paris, then pores will be closed which can lead to several respiratory problems.
    So, the correct answer is option B.
  • Question 8
    1 / -0
    The mammal whose testis come into scrotal sacs only during breeding time is
    Solution
    Testes are the organs that produce the germ cells and scrotum is the pouch that contains the testes. The evolution of the scrotal sacs in mammals has been mysterious and there exist many hypotheses to explain the probable function of the scrotum. Primarily they provide a space, that isolate and serves to provide a temperature, lower than the body; essential for the production, maturation, and storage of sperm cells. Bats in this respect are unique and exhibit testicular migration between abdomen and scrotum, while the cauda epididymis is permanently in the scrotal sacs.
  • Question 9
    1 / -0
    An aphid has two modes of reproduction; sexual, when food is sufficient and .............., when there is scarcity of food and uncrowded.
    Solution
    Aphids thrive on the basis of their number. Their technique to survive a predator is by outnumbering them. Thus, Aphids are good at reproduction, both sexual and asexual. They reproduce by sexual methods when the food is available. The Asexual method is called, parthenogenesis, which occurs when there is a scarcity of the food. With a few exceptions, all aphids are females in spring and summer, that expand exponentially. Thus, the correct answer is option C.
  • Question 10
    1 / -0
    Tertiary egg membrane is
    Solution
    There are three types of egg membranes. The primary or vitelline membrane is produced by the egg itself during the growth period and it consists of a thin transparent layer. The secondary membrane also called, chorion is secreted by auxiliary cells of the ovary. The tertiary membrane, albumen are secreted by cells of the female's genital tract, when ovum moves through the oviduct.
    Thus, the correct answer is option (C).
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