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Reproduction in Organisms Test - 25

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Reproduction in Organisms Test - 25
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  • Question 1
    1 / -0
    Rat is
    Solution
    Oviparous animals are the animals which lay eggs. Viviparous animals produce living young ones instead of eggs. Rats give birth to young ones.
    Ovoviviparous animals produce eggs that develop within the maternal body and hatch within or immediately after extrusion from the parent. Parthenogenetic is the reproduction by development of an unfertilized female gamete or egg that occurs especially among lower plants and invertebrates.
    Thus, the correct answer is option B.
  • Question 2
    1 / -0
    Transversely placed syncarpous ovary occurs in
    Solution
    In Cruciferae (Brassicaceae) gynoecium consisting of twocarpels placed transversely syncarpous. 
  • Question 3
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    Viviparity is observed in:
    Solution
    Viviparity means giving birth to young ones. Viviparous animals produce young ones instead of laying eggs. The female animal gives birth to the young ones which are just like little adults. 
    Rabbits give birth to young ones. 
    Frogs, lizards, and snakes lay eggs which later develop into young ones.
    So, the correct answer is option D.
  • Question 4
    1 / -0
    Arrhenotoky is related to 
    Solution
    Parthenogenesis can be complete or incomplete (cyclic). Arrhenotoky is the type of parthenogenesis where only males are produced from the unfertilized eggs. For example, rotifers, bees.
    Thus, the correct answer is option A.
  • Question 5
    1 / -0
    Which is the mode of reproduction in Amoeba?
    Solution
    • Binary fission is the asexual form of reproduction in which a single-celled organism divides itself into two cells, in favourable conditions.
    • Multiple fission is the asexual form of reproduction where the parent Amoeba cell divides to give many daughter cells in unfavourable conditions.
    • But, Amoeba may divide in binary or multiple fission modes of reproduction.
    Thus, the correct answer is option B.
  • Question 6
    1 / -0
    Natural parthenogenesis occurs in
    Solution
    Correct option: B

    Explanation:
    • Parthenogenesis is the process of developing an unfertilized egg into an adult animal species. It naturally occurs in is insects like honeybees, wasps and also in crustaceans. 
    • Sexual reproduction is seen in frogs, eggs are released from female and fertilization takes place outside the body i.e., external fertilization occurs.
    • Sea urchins also reproduce through sexual reproduction. They send clouds of eggs and sperm into the water and external fertilization occurs to form larvae.
      Thus, Option B is correct.
  • Question 7
    1 / -0
    In some species, parthenogenesis may alternate with sexual reproduction. This process is called as
    Solution
     Incomplete parthenogenesis or cyclic parthenogenesis is a process where sexual generation alternates with parthenogenesic generation. For example, in bees and wasps, some eggs develop without fertilization and produce males, while those eggs that are fertilized developed into females. Thus, the correct answer is option B.
  • Question 8
    1 / -0
    Vivipary means
    Solution
    Vivipary is the condition, where the embryo grows first to break through the seed coat and then out of the fruit wall while still attached to the parent plant. This condition is found in Bruguiera, Ceriops, Kandelia and Rhizophora species.
  • Question 9
    1 / -0
    Normally the number of chromosomes in the nuclei of gametes, that fuse at fertilization are 
    Solution
    Sperms and eggs are special cells, called as gametes. They have nuclei containing half the normal number of genes. For example, if the cell has total 46 chromosomes, then the nuclei of the gamete contains 23 chromosomes. During fusion, the nuclei will have the same number of chromosome as in the gamete.
    So, the correct answer is option C.
  • Question 10
    1 / -0
    Fertilization is depicted by which of the following condition? 
    Solution
    Fertilization is the process of fusion of male and female gametes. Gametes are haploid (n) in nature and the fusion of the two results in the diploid (2n) product called as zygote. Zygote is the universal diploid cell. 
    Thus, the correct answer is option A.
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