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Plant Kingdom Test - 87

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Plant Kingdom Test - 87
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Opening of floral buds into flowers, is a type of:
  • Question 2
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    Heterotrichous habit is shown by
    Solution
    'Hetero' means different and 'trichous' denotes trichome or filament. In some algae, the plant body is very much evolved and consists of more than one type of filaments and thus, represents the heterotrichous habit. It is one of the characteristic feature of Chaetophorales of Chlorophyceae. For example- Draparnaldia, Stigeoclonium.
    Thus, the correct answer is option A.
  • Question 3
    1 / -0
    One of the following is a social foresting species with multiple utility 
    Solution
    Leucaena leucocephala (Subabul) is a social foresting species with multiple utility like green manure, biomass production, food for humans, pulpwood for paper industry.
  • Question 4
    1 / -0
    The life cycle of plants shows two distinct phases: a diploid (sporophytic) phase and haploid (gametophytic) phase which alternate with each other. The generalized pattern can be represented as in the following diagram:
    Afreen studied the life cycles of 3 dierent plants: I, II, III, and made the following observations.
    Plant I: Shows dominant gametophyte, sporophyte semi-parasitic on parent gameto-phyte.
    Plant II: Shows reduced gametophyte, dominant sporophyte. Both phases are inde-pendent.
    Plant III: Shows reduced gametophyte, dominant sporophyte. Gametophyte is pro-duced within the sporophyte and not as separate generation.
    Based on the information provided, which of the following options do you think rep-resents the correct sequence of plant groups to which plants I, II and III belong to?

  • Question 5
    1 / -0
    One of the following occurs both in fresh water and marine habitat.
    Solution
    Cladophora, a cosmopolitan species present in temperate and tropical regions, occurs in freshwater, brackish and marine conditions. The various species are found intertidally in wave-exposed to very sheltered habitats, in brackish pools, lagoons and mudflats, and in more or less eutrophic freshwater streams and lakes with pH > 7.
    Thus, the correct answer is option C.
  • Question 6
    1 / -0
    Cell wall of diatom consists of
    Solution
    Diatoms are algae with distinctive, transparent cell walls made of silicon dioxide hydrated with a small amount of water. Silica is the main component of glass and hydrated silica is very like the mineral opal, making these algae, often called as "algae in glass houses" more like "algae in opal houses". The cell wall of diatom is called as frustule.
    Thus, the correct answer is option C.
  • Question 7
    1 / -0
    Which species of protists are known as the 'whirling whips' because of the spin produced by two flagella beating in opposing grooves along their hard surfaced bodies?
    Solution
    A whirling whip is the Greek and Latin translation of dino-flagellate. This microscopically small algae has a thin (cellulose) outer skeleton, that can move around with the help of flagella (whirling whips).
    Thus, the correct answer is option C.
  • Question 8
    1 / -0
    The first division of zygote is a reduction division in
    Solution
    In algae, there is intermediary meiosis, producing an alternation of generations similar to that seen in plants, with significant portions of the life cycle spent as haploid as well as diploid.
    Thus, the correct answer is option A.
  • Question 9
    1 / -0
    Pyrenoid consists of
    Solution
    Pyrenoids are sub-cellular micro-compartments found in chloroplasts of many algae and in a single group of land plants, the hornworts. A pyrenoid consists of a central protein body surrounded by a starch envelope. The central mass of protein is called pyreno-crystal.
    Thus, the correct answer is option A.
  • Question 10
    1 / -0
    Zygotic meiosis occurs in
    Solution
    Correct Option: D
    Explanation:
    • The fertilized ovum(Zygote) undergoes cellular division to form haploid spores and therefore zygotic meiosis happens in algae.
    •  The haploid spores bear mitosis to form haploid gametophytes. 
    • The haploid gametes are shaped by the meiosis of the sporophyte. This is a diplontic life cycle. Hence, Zygotic meiosis occurs in Algae.
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