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Reproduction in Organisms Test - 46

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Reproduction in Organisms Test - 46
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  • Question 1
    1 / -0
    The common mode of sexual reproduction in Chlamydomonas is
    Solution
    Chlamydomonas reproduces both asexually and sexually. 
    Asexual reproduction takes place by zoospores while sexual reproduction can be isogamous, anisogamous or oogamous. 
    Though, commonly fusion takes place between similar gametes hence reproduction takes place by isogamy.
    So, the correct option is 'Isogamous'.
  • Question 2
    1 / -0
    Organisms which give birth to young ones directly are
    Solution
    Option C viviparous
    Animals that have live births because they nourish the unborn young internally with a placenta are the mammals, except the monotremes. They retain their eggs internally until they hatch then feed the young milk. These are the viviparous mammals.
  • Question 3
    1 / -0
    A motile asexual spore with flagella is known as
    Solution
    • Asexual spores are formed after mitosis (mitospores) without the involvement of meiosis.
    • There are many types of asexual spores like zoospores (motile due to presence of flagella), aplanospores (nonmotile), conidia and oidia, etc.
    • Zoospore and aplanospores are endogenous while conidia and oidia are exogenous in nature.
    • Zygospores (fungi) and tetraspores (red algae) are sexual spores.
    • Zygote is not a spore. Zygote is formed due to the fusion of male and female gametes.

    So, the correct answer is option A.
  • Question 4
    1 / -0
    Which corresponds to parthenogenesis?
    Solution
    Parthenogenesis is the production of an embryo from a female gamete without any genetic contribution from a male gamete, with or without the eventual development into an adult. It corresponds to endomixis since the nuclear reorganization leads to the formation of macronucleus which also results in rejuvenation of the organism.
    So, the correct option is 'Endomixis'.
  • Question 5
    1 / -0
    Fusion between dissimilar gametes is
    Solution
    • Autogamy is the fusion of 2 different types of gametes that are from the same individual. Though, genetically they are similar as they're from the same individual.
    • Isogamy is the fusion of gametes that are similar.
    • Allogamy is the fusion of two different types of gametes between two different individuals. This term is commonly used for plants. These gametes are dissimilar genetically too.
    • Dichogamy is the production of male and female reproductive elements at different times by a bisexual organism in order to ensure cross-fertilization.
    So, the correct option is 'Allogamy'.
  • Question 6
    1 / -0
    Match the columns and find the correct option.
    III
    (i)Dahlia(a)Eyes
    (ii)

    Solanum tubersoum

    		(b)Runner
    (iii)Begonia(c)Fasciculated tuberous roots
    (iv) Cynodon (d)Epiphyllous buds
    Solution
    Roots that grow from any part of plant other than the radicle are called adventitious roots. When adventitious root becomes thick and fleshy due to storage of food, it is called as fleshy adventitious root.  When swollen root occurs in cluster, it is called as fasciculated tuberous roots. Dahlia shows this type of root. In it, roots lie at the base of the stem. Solanum tuberosum is commonly known as potato. It is a starchy tuber that grows under the ground. It has nodes or eyes from which the new growth begins. The buds present in the depression of leaf margins are called as epiphyllous buds. Examples include Begonia and Bryophyllum plants. Runner is a stem grown on the ground surface. Cynodon has runner. It has 3 leaves at each node on the extended runners. 
    Thus, the correct answer is 'i-c, ii-a, iii-d, iv-b.'
  • Question 7
    1 / -0
    Which is not a rhizome?
    Solution
    Rhizome is fleshy, non-green underground stem. It has distinct nodes and internodes
    Eg: ginger. lotus, turmeric, canna
    A. Colocasia is a corm which is a condensed form of rhizome growing in vertical direction
    Option "A" is correct. 
  • Question 8
    1 / -0
    Oogamous sexual reproduction involves fusion of
    Solution
    Oogamous reproduction involves fusion of one motile male gamete and another non-motile large sized female gametes. 
    Fusion of similar gametes is known as isogamous reproduction. Fusion of dissimilar motile or non-motile gametes is known as anisogamous reproduction.
    So, the correct option is 'Motile and non-motile gametes'.
  • Question 9
    1 / -0
    Banana is multiplied through
  • Question 10
    1 / -0
    Mentha (Mint) has one of the following
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