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Biological Classification Test - 24

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Biological Classification Test - 24
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  • Question 1
    1 / -0
    For Mucor zygospore is
    Solution
    Zygospore is  a resting spore, produced by the fusion of two compatible gametangia. The mature zygospore is often thick-walled, and undergoes an obligatory dormant period before germination.
  • Question 2
    1 / -0
    The zygospore in Rhizopus develops into
    Solution
    In Rhizopus, the male (+) and female (-) gametangia fuse and the gametangial copulation leads to the formation of a zygospore. It contains many pairs of nuclei. Some of these pairs of nuclei fuse to produce diploid nuclei, while others degenerate. The young zygospore enlarges and probably secretes five layered (two in exospore and three in endospore) thick wall, which undergoes a period of rest. On germination, the innermost layer comes out after cracking the outer walls and produces a promycelium. With further develop­ment, the promycelium is differentiated into a lower stalk like sporangiophore and an upper spherical sporangium. Meiosis occurs during zygospore germi­nation and the haploid nuclei form haploid spores like sporangiospores inside the sporangium.
    Thus, the correct answer is option B.

  • Question 3
    1 / -0
    Which of the following plant and its mode of nutrition is not correctly matched?
    Solution
    Mucor are wide spread in soil, dung and other decomposing organic materials. All the species are saprobic and grow as white cottony mycelium on the moist and organic matter.
  • Question 4
    1 / -0
    Sporangiospores of Mucor are
    Solution
    When moisture and abundant food material are available, the basal vegetative hyphae produce erect aerial unbranched hyphae, called as sporangiophores. These are always produced singly. When erect hyphal sporangiophores are formed. The tip of the sporangiophore swells to form a globose sporangium that contains uninucleate, haploid sporangiospores. An extension of the sporangiophore called as, the columella protrudes into the sporangium. The sporangium walls are easily ruptured to release the spores, which germinate readily to form a new mycelium on appropriate substrates.
  • Question 5
    1 / -0
    In Rhizopus, if conjugation fails, gametangia behave as zygophore. It is called as
    Solution
    During conjugation in Rhizopus,  one positive mycelium comes in contact with another negative mycelium. It stimulates the formation of specialised hyphae called zygophores. When conjugation fails, gametangia behaves as zygophores. It is called as parthenospore.
  • Question 6
    1 / -0
    Mucor shows
    Solution

    Isogamy is sexual reproduction by the fusion of similar gametes. Here similar implies similar shape and size of the male and female gametes. Mucor commonly known as a mould is an example of isogamy. Hence correct answer is option A.

  • Question 7
    1 / -0
    Mode of nutrition in Rhizopus is
    Solution
    Rhizopus belongs to kingdom Fungi. It adopts the heterotrophic mode of nutrition. It is a saprophyte as it feeds on the dead and decaying material of the soil. The saprophytes release enzymes which break the organic compounds present in the dead and decaying matter into simpler compounds. Proteins are broken down into amino acids, lipids into fatty acid and glycerol and starch into glucose. These products are re-absorbed into the hypha through the cell wall via endocytosis and passed on throughout the mycelium complex and it sued for growth and development of the plant
    So, the correct answer is 'Saprophytic'
  • Question 8
    1 / -0
    Branched, aseptate, coenocytic mycelium is present in
    Solution
    The mycelium of Albugo has branching but it lacks the septa which give it a multinuclear or coenocytic. Hence, the mycelium of Albugo is described as branched, aseptate and coenocytic.
    The correct answer is option B.
  • Question 9
    1 / -0
    Rhizopus reproduces asexually through
    Solution
    Rhizopus is a filamentous fungus and it reproduces by sporangiospores, aplanospores and chlamydospores. Sporangiospores are produced by asexual mode in the sporangium. The sporangium is supported by the sporangiophore and rhizoids. Sporangiospores produces may undergo mitosis to form other spores or undergo meiosis to form haploid spores. Columella is present in the sporangium. The space between columella and wall of sporangium is known as spore sac. It remains filled with sporangiospores or aplanospores which germinates to form mycelia. Chlamydospores are thick-walled, asexually produced spores arising from the modification of a hyphal segment.
    So, the correct answer is option D.
  • Question 10
    1 / -0
    The wall of Rhizopus hypha is composed of 
    Solution
    Rhizopus is a genus of saprophytic fungi. The hypha is a long filamentous structure which helps in the vegetative growth. The hypha is multicellular where each cell surrounded by the tubular cell wall and separated by cross walls known as septa. The cell walls are composed of structural polymer known as chitin. It is a long chain polymer of N-acetylglucosamine. 
    So, the correct answer is option B.
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