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Plant Kingdom Test - 39

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Plant Kingdom Test - 39
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following statement is incorrect?
    Solution
    Correct Option: A
    Explanation:

    • Algae are chlorophyll-bearing, simple, thalloid, autotrophic and largely aquatic (both fresh and marine) organisms.
    • The form and size of algae are highly variable.
    • The size ranges from the microscopic unicellular forms like Chlamydomonas to colonial forms like Volvox and to the filamentous forms like Ulothrix. 
    • Algae may be unicellular and multicellular eukaryotes. 
    Hence, the incorrect statement is that all algae are microscopic.
  • Question 2
    1 / -0
    Which of the following groups of algae do not have eukaryotic organisation? 
    Solution
    Blue green algae may have some similarities to green plants but structurally they are more similar to Monerans.
    Cyanobacteria or blue green algae have following characters which shows that they do not have eukaryotic organiation:
    1. Blue green algae are prokaryotes and do not contain a true nucleus.
    2. Blue green algae like Monerans also have a rigid thick peptidoglycan cell wall.
    3. The mucilaginous sheath surrounding the cell of blue green algae and the capsule present in many Monerans poses a similar structure.
    4. Like the Monerans, blue green algae also lack true sexual reproduction and reproduce asexually.
    5. Blue-green algae also fix the atmospheric nitrogen like the other members of Kingdom Monera.
    6. Like many Bacteria that release the bacterial toxin, blue green algae also release toxins that are harmful to aquatic fauna.
    Hence, answer is 'Blue green algae'
  • Question 3
    1 / -0
    Spirogyra is commonly called pond silk because 
    Solution
    Spirogyra is the filamentous green algae. It is found in freshwater habitats like ponds. It has spiral green coloured chloroplasts that contain chlorophyll. The outer cell wall of the spirogyra has pectin. This pectin produces mucilage. It is because of the presence of this mucilage that it shines like silk. 
    So, option C is the correct answer.
  • Question 4
    1 / -0
    Angiosperms are
    Solution
    Correct Option: B
    Explanation:
    • Angiosperms are flowering plants whose seeds are covered by or enclosed in fruits that develop from the ovary.
    • Gymnosperms are naked seeded plants.
    • Cryptogams are non flowering plants. E.g-  Algae, Bryophyte, Pteridophyte
    Hence, angiosperms are closed seeded plants.
  • Question 5
    1 / -0
    An example of angiosperm (closed seeded plant) is
    Solution
    • Pinus, Cedar, and fir are examples of gymnosperms which are usually big trees. 
    • These do not bear true flowers but bear naked seeds inside cones.
    • Mango, peas, and cashew are examples of angiosperms that bear flowers, fruit, and seeds. 
    • Their seeds are enclosed in a fruit. 

    Thus, Option A is correct.
  • Question 6
    1 / -0
    Which of the following algae produces agar-agar?
    Solution
    Agar is produced from algae Chlamydomonas. It is a jelly-like substance obtained from agaropectin and agarose.
    So, option C is the correct answer.
  • Question 7
    1 / -0
    The mosses we see on the damp, old brick walls are
    Solution
    • Bryophytes are called the amphibians of the plant kingdom. 
    • The plant body is commonly differentiated to form stem and leaf-like structures. 
    • However, there is no specialized tissue for the conduction of water and other substances from one part of the plant body to another. 
    • Examples are moss (Funaria) and Marchantia.

    So, the correct answer is option B.
  • Question 8
    1 / -0
    Bryophytes are dependent on water because 
    Solution
    Bryophytes show sexual mode of reproduction. The female reproductive organ is called archegonium and male reproductive organ is antheridium. The sperms that are formed in male antheridium reach the female archegonium for the process of fertilisation to take place.
    So, option D is the correct answer. 
  • Question 9
    1 / -0
    The heart shaped fern prothallus is _________
    Solution
    The heart-shaped prothallus is the characteristic feature of ferns and mainly belong to Polypodiaceae. They show polarity and dorsoventrally. The prothallus contains both the antheridia and archegonia which are embedded in the prothallus. Since it forms the male and female gametes the prothallus -is considered as the gametophyte.
  • Question 10
    1 / -0
    The plants which are differentiated into roots, stems and leaves but do not bear flowers and seeds are classified as
    Solution
    • The plant body of pteridophytes is differentiated into roots, stem, and leaves and has specialized tissue for the conduction of water and other substances from one part of the plant body to another. 
    • Some examples are Marsilea, ferns, and horsetails. The reproductive organs of plants in all these three groups are very inconspicuous, and they are therefore called ‘cryptogams’, or ‘those with hidden reproductive organs’. They do not bear flowers and seeds.
    Hence, the correct option is C.
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