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Plant Kingdom Test - 32

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Plant Kingdom Test - 32
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  • Question 1
    1 / -0
    Unique character of Thallophyta is:
    Solution
    • The thalloid body refers to an undifferentiated body that is not divided into stem, root, and leaves. 
    • The thalloid body is found in thallophytes and in some bryophytes. 
    • Both thallophytes and bryophytes are nonvascular plants. 
    • Meiosis in the zygote just after karyogamy is referred to as zygotic meiosis. 
    • It is a characteristic feature of thallophytes wherein the zygote is the only diploid stage during the life cycle. 

    Thus, the correct answer is option D. 
  • Question 2
    1 / -0
    Blue - green Algae resembles more closely to
    Solution
    Blue-greens are more akin to bacteria which have similar biochemical and structural characteristics. Blue-green algae possess photosynthetic pigments like phycoerythrin and  does not have flagellated gametes similar to  red algae.
  • Question 3
    1 / -0
    Gametes are non-motile in
    Solution
    • Cyanophyceae (blue-green algae) reproduce by simple division/fragmentation or non-motile spores and do not exhibit any motile phase during the life cycle.
    • Red algae (Rhodophyceae) are characterized by the absence of any motile gametes or spores. 
    • Chlorophyceae (green algae) reproduce by zoospores with two identical anterior flagella. 
    Thus, the correct answer is option C. 
  • Question 4
    1 / -0
    Spermatia are male gametes of
    Solution
    Spermatia are the non-motile, colorless males gametes found in red algae and some fungi. Hence option A is correct. 
  • Question 5
    1 / -0
    Name the algae, which have food conducting tubes similar to phloem in vascular plants.
    Solution
    In some large brown algae, certain cells are modified into long filaments called trumpet hyphae. These act as food-conducting tubes, like phloem in vascular plants carrying food from lamina to the holdfast.
  • Question 6
    1 / -0
    Cilia and flagella are absent in life cycle of
    Solution
    Cilia and Flagella are absent in red algae as well as blue-green algae. Blue green algae moves by gliding movement and Red algae lacks flagella.
    Hence, the answer is 'Red algae and blue green algae'
  • Question 7
    1 / -0
    Cap cells occur in
    Solution
    Oedogonium thallus is a long, unbranched, filamentous structure consisting of a single row of elongated, cylindrical cells arranged end to end. The filament usually occurs attached with the substratum at thelower end by means of a basal cell, the rhizoidal cell or holdfast,expanded into a flattened disc with outgrowths. Certain cells in every filament possess one or more ring like markings of hemicellulose at their distal ends are called cap cells.
  • Question 8
    1 / -0
    Which algae best explains the evolution of sexual reproduction?
    Solution
    Clamydomonas and Ulothrix in green algae best explains the evolution of sexual reproduction. 
    The first sexuality was seen in the Clamydomonas and Ulothrix in the from of isogamy that the gamates formed were of plus and minus strains. Next evolution is seen is the ansiogamy that the gametes are of different size. 
    hence the correct option is A. 
    The further more advanced evolution in the sex repdroduction is seen in the red algae and brown algae. so the options B and C are not correct. 
  • Question 9
    1 / -0
    Chlorophyll 'c', 'd' and 'e' are characteristic pigments of respectively.
    Solution
    The brown algae contains xanthophyll pigment fucoxanthin, chlorophyll 'a' and 'c' (no chlorophyll b), beta-carotene. 
    Red algae contain chlorophyll  'a'  and 'd' as well as phycobilins, red and blue pigments involved in photosynthesis. 
    Yellow green algae contains chlorophyll 'a' but lack chlorophyll 'b'. They possess chlorophylls 'e' or 'c'. Besides these they also possess xanthophylls and beta carotene.
    Therefore, the correct answer is option B.
  • Question 10
    1 / -0
    Female sex organ of algae is called as
    Solution

    Algae reproduce sexually with the help of male and female gametes, male gametes are present in antheridium and female gametes are present in oogonium.  Oogonium is a non-motile organ, and it gets fused by male gametes during the process of sexual reproduction.

    The correct answer is B.

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