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Reproduction in Organisms Test - 26

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Reproduction in Organisms Test - 26
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  • Question 1
    1 / -0
    The animals in which complete embryo develops in the mother's body through placenta are 
    Solution
    • Oviparous animals are the animals that lay eggs.
    • Viviparous animals give birth to the living offspring that develop within the mother's body (as in the case of most of the mammals).
    • Ovo-viviparous give birth to the young ones in eggs which are hatched within the female body (as in some reptiles and fishes).
    • Herbivorous animals are those that feed exclusively on vegetable food.
    So, the correct answer is option B.
  • Question 2
    1 / -0
    Which type of stimulus is used to achieve parthenogenetic development?
    Solution
    The stimulus which are used to induce artificial parthenogenesis are chemicals like salts, weak acids, organic solvents, (chloroform) urea, sucrose, strychnine and physical stimuli like temperature, electric shock or mere shaking, a needle smeared with blood (egg of frog) and saline solution (egg of sea urchin).
    Thus, the correct answer is option D.
  • Question 3
    1 / -0
    Female rabbit 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.
    Whereas polyestrous means having many estrous cycles per year. A female rabbit is an example of polyestrous. Thus, the correct answer is option C.
  • Question 4
    1 / -0
    The phenomenon of fertilization was first perceived by 
    Solution
    The phenomenon of fertilization was first perceived by the German biologist Oscar Hertwig in sea urchin eggs in 1876. Hertwig observed that the sperm nuclei and egg fused during fertilization resulting in the generation of new organism. Thus the correct answer is option D.
  • Question 5
    1 / -0
    In the egg of bird, shell and shell membranes are
    Solution
    Reptiles and birds and some insects have developed eggs with a shell impermeable to water. These shells allow oxygen to diffuse into the egg and carbon dioxide to diffuse out. Such eggs which does not allow the transport except for gas exchange are called as cleidoic eggs.
    Thus, the correct answer is option (A).
  • Question 6
    1 / -0
    Vegetative propagation in mint occurs by :
  • Question 7
    1 / -0
    The following figure illustrates :

    Solution
    The figure illustrates binary fission in Amoeba. Amoeba is a unicellular prokaryote. The organism undergoes reproduction by binary fission in which the cell divides to give rise to two daughter amoeba cells. 
  • Question 8
    1 / -0
    Propagation of ginger is generally done using:
    Solution
    Vegetative propagation is defined as the production of new plants from the vegetative plant parts like leaf, stem, roots of the parent plant. In ginger, the vegetative propagation occurs through the underground stem called rhizome. A rhizome is an underground horizontal stem, with stored foods and buds. Manufactured foods are transported down to enable the growth of the rhizome. The lower portion of the rhizome develops roots and helps in the conduction of water and minerals.
    Thus, the correct answer is option (B), 'Stem (rhizome)'.
  • Question 9
    1 / -0
    In markets, eggs of birds are available but never of dogs, because:
    Solution
    Birds are oviparous animals which means that they lay eggs. On the other hand, dogs do not lay eggs and are viviparous animals which means that dogs give birth to young ones directly. So, the correct answer is option A.
  • Question 10
    1 / -0
    A slide showing several amoeba was given to a student and was asked to focus the Amoeba undergoing binary fission. What will the student look for to correctly focus on a dividing Amoeba ?
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