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Plant Kingdom Test - 16

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Plant Kingdom Test - 16
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  • Question 1
    1 / -0
    An example of colonial alga is:
    Solution
    Volvox is a unicellular green alga found in freshwater bodies. It is photosynthetic in nature. It forms colonies of around 50,000 cells which are spherical in shape. Thus the correct answer is option C.
  • Question 2
    1 / -0
    Male gametes are flagellated in
    Solution
    Ectocarpus is a brown alga. It is abundantly found throughout the world in cold waters. The male gametes typically contain a single chloroplast with a pyrenoid and a prominent concave eye spot, into which the swelling of the posterior flagellum (the photoreceptor) fits.
    Thus, the correct answer is option A.
  • Question 3
    1 / -0
    Which of the following is not correctly matched for the organism and its cell wall degrading enzyme?
    Solution
    The green algae produce cell walls containing polymers similar to land plants. The red algae possess complex composite cell walls made up of cellulose, xylan or mannan fibrils and extensive matrix polysaccharides and so in short, algal cell wall is made up of cellulose and thus can be degraded by the enzyme cellulase. Whereas, methylase is the enzyme that adds a methyl group to the adenine of the RNA.
    Thus, the correct answer is option C.
  • Question 4
    1 / -0
    Metagenesis refers to
    Solution
    When one generation of certain plants and animals reproduces asexually, followed by a sexually reproducing generation is called as metagenesis. It is also called as alternation of generation.
    So, the correct answer is 'Alternation of generation between asexual and sexual phases of an organism'
  • Question 5
    1 / -0
    Zygotic meiosis is a characteristic of:
    Solution

    A. Correct option A

    B. Explanation for correct option:

    When the zygote divides meiotically or when zygote undergoes reduction division after division of nucleus i.e. after karyogamy it is called as zygotic meiosis. Zygote is a stage that is formed after fertilization.Chlamydomonas is haploid plant. Hence, zygotic meiosis occurs in chlamydomonas.

  • Question 6
    1 / -0
    Which one of the following statements is wrong?
    Solution
    (A) Correct option (D)
    (B) Explanation of correct answer:

    • Agar-agar is a gelling agent with unbranched polysaccharides and is used in microbiology as a solidifying agent of liquid culture mediums. It is extracted from the cell wall of red algae, mostly from Gelidium species and Gracilaria species.
    • Laminaria and Sargassum are the brown algae and are cultivated as a crop. 
    • Algae are green photosynthetic organisms that release oxygen in immediate vicinity through the process of photosynthesis. 
    • The cell wall of brown algae has an inner cellulose layer and outer gelatinous coat which is composed mainly of algin, it is used as an emulsifying agent and a stabilizer. 
  • Question 7
    1 / -0
    Which one of the following statements is wrong?
    Solution
    A.Correct option -B

    B.Explanation for correct option -B
    ●Food is stored as floridean starch in Rhodophyceae. 
    ●The members of Phaeophyceae which is known as brown algae store mannitol as a reserve food material.
  • Question 8
    1 / -0
    Which statement is correct regarding mosses?
    Solution
    In mosses the sporophytes (i.e. the diploid body) are short-lived and dependent on the gametophyte. In the presence of water, sperms from the antheridia swim to the archegonia and fertilization occurs, leading to the production of a diploid sporophyte. The sperm of mosses is biflagellate, i.e. they have two flagella that aid in propulsion. Since the sperms must swim to the archegonium, fertilization cannot occur without water.
  • Question 9
    1 / -0
    At present about _________ animal phyla have been recognized.
    Solution
    Kingdom animalia is further subdivided into sub kingdom, phyla and sub-phyla. At present about $$30$$ phyla have been recognized of which $$10$$ are major and $$20$$ are minor.
  • Question 10
    1 / -0
    Amongst the following which is obtained from algae?
    Solution
    Chocolate is prepared using cocoa beans and not algae, while wax is obtained from honey bee and butter is a milk product and not obtained from algae. Agar-agar is a gelatinous substance obtained from algae. Agar is actually the resulting mixture of two components: the linear polysaccharide agarose, and a heterogeneous mixture of smaller molecules called as agaropectin.
    Thus, the correct answer is option D.
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