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Reproduction in Organisms Test - 45

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Reproduction in Organisms Test - 45
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  • Question 1
    1 / -0
    Yeast reproduces by the process called:
    Solution
    Yeast reproduces by the process called budding. Budding is a type of asexual reproduction in which a small outgrowth emerges from the parent's body. On attaining maturity it detaches from the parent's body and develops into an independent individual.
    Hence, option 'D' is the correct answer. 
  • Question 2
    1 / -0
    When the nucleus of pollen grain fused with the nucleus of ovum .......... is formed.
    Solution
    A zygote is a product of gamete fusion. In flowering plants, anther on stamen produces spores that become pollen. Sperm nuclei are produced by the pollen. Carpel in the flower produce ovules that gives egg nuclei. Sperm fuses with the egg to form a zygote.
    So the correct answer is 'Zygote'.
  • Question 3
    1 / -0
    Bud is formed in which of the following organism? 
    Solution
    • Budding involves the development of a new organism from an outgrowth or bud.
    • Yeast reproduces by budding. 
    • In yeast, small buds are produced that remain attached initially to the parent cell, but, eventually, get separated and develop into a new individual.
    • So, the correct answer is 'Yeast'.
  • Question 4
    1 / -0
    All of the following stages occurs in asexual reproduction, except
    Solution

  • Question 5
    1 / -0
    The zygote develops into the
    Solution

  • Question 6
    1 / -0
    Name the cell formed as a product of fertilization.
    Solution
    A fertilization event takes place by the fusion of gametes. A gamete is a haploid cell which has half the required number of chromosomes. Sperm, of paternal origin and egg, of maternal origin fuse to form a zygote (which has the required number of chromosomes) in fertilization. Zygote is capable of undergoing cell division to form a new individual.
    So the correct answer is 'Zygote'.
  • Question 7
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    When members of a population attain sexual maturity at different times preventing interbreeding, it is termed as ________ isolation
    Solution
    • There are different mechanisms of reproductive isolation. Isolation mechanism which prevent interspecific crosses includes seasonal isolation, mechanical isolation, habitat (ecological) isolation, ethological isolation, physiological isolation, etc. 
    • All these are premating isolation meaning isolation that prevents mating from even happening. When members of a population attain sexual maturity at different times preventing inter-breeding, it is called seasonal or temporal isolation. 
    • When a lack of sexual attraction between opposite sex preventing inter-breeding, it is termed as ethological isolation. 
    • When there is a difference in size, shape or location of the genitalia of the males and females preventing inter-breeding, it is termed as mechanical barrier. 
    • When two species are ecologically or geographically separated preventing inter-breeding, it is termed habitat isolation.
    Thus, the correct answer is option A.
  • Question 8
    1 / -0
    In chlorophyceae, sexual reproduction occurs by:-
    Solution
    Chlorophyceae is a class of algae that is also known as green algae commonly. Different members of this class reproduce differently.
    They reproduce by fusion of similar gametes ( isogamy ), the fusion of dissimilar gametes ( anisogamy ) as well as the fusion between a small non-motile and a large non-motile gamete (Oogamy).
    So, the correct answer is 'Isogamy, anisogamy, and oogamy'.
  • Question 9
    1 / -0
    Motile zoospores are produced by
    Solution
    Zoospores are flagellated asexual spores produced in chlorophyceae. They are biflagellate in Chlamydomonas, bi or quadri-flagellated in Ulothrix and multi flagellated in Oedogonium. They help in rapid reproduction under favourable environmental conditions. 
    Penicillium reproduces asexually by means of non-motile spores called conidia born on erect aerial hyphae called conidiophores. 
    Bacterial spores are covered by thick and tough covering which are resistant to extreme environmental conditions. 
    Amoeba reproduces asexually by binary fission or multiple fission.
    Thus, the correct answer is option A.
  • Question 10
    1 / -0
    During favourable conditions, the most common mode of multiplication in Chlamydomonas is by producing
    Solution
    When the conditions are favorable the zoospores were formed. The cell becomes no motile during the formation of zoospores and the flagella are distracted or retracted.
    So the correct option is 'zoospores'.
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