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Plant Kingdom Test - 21

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Plant Kingdom Test - 21
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  • Question 1
    1 / -0
    Chlamydomonas does not occur in
    Solution
    Chlamydomonas is a genus of unicellular, motile flagellates that occur in stagnant water, damp soil, in freshwater, seawater and in snow (snow algae).
    Therefore, the correct answer is option D.
  • Question 2
    1 / -0
    The thallus of Volvox is called as
    Solution
    When the number and arrangement of cells are determined at the time of origin and remain constant during the life span of the individual colony, such colony is termed coenobium. Each mature Volvox colony is composed of numerous flagellate cells similar to Chlamydomonas, up to 50,000 in total, and embedded in the surface of a hollow sphere or coenobium containing an extracellular matrix made of a gelatinous glycoprotein.
    So, the correct answer is option B.
  • Question 3
    1 / -0
    Which of these is mismatched?
    Solution
    The word bryophyte is the collective term for mosses, hornworts and liverworts and bryology is the study of bryophytes. Bryophytes derived from Greek, 'Bryon' means moss and 'phyte' means plant. 
  • Question 4
    1 / -0
    The largest bryophyte is
    Solution
    Dawsonia is a classification of mosses. They are the largest bryophyte. Dawsonia plants are commonly known to grow taller and have thicker leaves than other common mosses. The tallest known moss in the world is the Dawsonia superba species. Its stem may reach up to 19.75 inches tall.
  • Question 5
    1 / -0
    Algae attached to a stone is called as
    Solution
    Algae growing on a rock is called as epilithic. Endolithic algae live in porous rocks or coral and chasmolithic algae grow in rock fissures. So, option A is the correct answer.
  • Question 6
    1 / -0
    Reserve food material of algae is
    Solution
    Algae can either be autotrophic or heterotrophic in nature. Most of them are photoautotrophic i.e., they need only light and carbon dioxide as their chief source of energy and carbon. Chemoheterotrophic algae require other external organic compounds as carbon and energy sources. Reserved food materials present in algae include starch, oils, floridean starch, laminarin, paramylon, soluble carbohydrates and chrysolaminarin. 
  • Question 7
    1 / -0
    Pyrenoids in green algal cells are related to
    Solution
    Pyrenoids in green algal cells are related to the starch formation. They are sub-cellular micro-compartments found in chloroplasts of many algae. They are associated with the operation of a carbon-concentrating mechanism (CCM). This is a region of the chloroplast in which most of the RuBisCO in the chloroplast is located, which is a carbon-fixing enzyme.
    So, the correct answer is option D.
  • Question 8
    1 / -0
    In Chlamydomonas, the meiosis occurs in
    Solution
    In Chlamydomonas, zygotes undergo a resting stage prior to meiosis, during which a multi-layered zygote wall is deposited. Basal bodies reappear at interphase. Heterochromatin is not visible in the interphase nucleus. Leptotene is characterized by the appearance of axial cores and the condensation of chromenemata. By early zygotene, axial elements associated with the condensing chromatin associate with the nuclear envelope. Tubular elements appear in the perinuclear space adjacent to the associated chromosomes. Bivalents begin to associate with the nucleolus. By pachytene, typical synaptinemal complexes have formed. The synaptinemal complexes possess two lateral elements associated with the chromosomes and separated by a central space of about 130 nm. A central element may form midway between the lateral elements and be joined to them via transverse elements. Separated synaptonemal complexes appear in the cytoplasm by diplotene-diakinesis. At this stage the chromosomes become most condensed and chiasmata occur. The nucleolus disappears. 
  • Question 9
    1 / -0
    Meiotic division in zygote takes place in
    Solution
    Zygotic or Initial meiosis takes place in Thallophytes. During the process of fertilisation, the two gametes fuse to form a zygote which represents the only diploid stage in the life-cycle. The zygote undergoes meiosis and forms four haploid cells which later on develop into haploid individuals. 
    So, the correct answer is option A.
  • Question 10
    1 / -0
    First vascular plant is
    Solution
    • Pteridophytes are the first vascular land plants, which possess true roots, stems, and leaves, as well as vascular tissues. 
    • They reproduce by spores because they do not produce flowers and seeds.
    Thus, the correct answer is option C.
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