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Plant Kingdom Test - 33

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Plant Kingdom Test - 33
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  • Question 1
    1 / -0
    Which of the following statements is true for Algae?
    Solution
    Algae are a group of chlorophyll bearing, photosynthetic, autotrophic, thalloid plants whose body is not differentiated into true roots, stems and leaves. Hence, body of algae is thallus as it is not differentiated into true stems, leaves and roots.
    So, the correct answer is 'Body of Algae is thallus'.
  • Question 2
    1 / -0
    The bryophyte which can absorb water upto 18 times of its weight?
    Solution
    Sphagnum that generally grows in bogs are slightly antiseptic and can absorb large amount of water i.e., upto 18 times its weight. On account of these properties they may be used for filling absorbent bandage in place of cotton, in the hospitals. The plants absorb and hold water in them. For these properties they are used in seed beds and green houses to root cuttings. They are also used to maintain high soil acidity required by certain plants.
  • Question 3
    1 / -0
    Normally phycobilins occur in
    Solution
    Phycobilins are more appropriately called phycobiliproteins. They comprise of a bile pigment or phycobilin attached to a protein. The pigment forms the chromophoric moiety of the biliprotein. The bile pigment shows an open chain tetrapyrrole structure. Three classes of biliproteins are recognised namely phycoerythrin, phycocyanin and allophycocyanin. They are mainly found in red (Rhodophyceae) and blue green (Cyanophyceae) algae.
  • Question 4
    1 / -0
    Gametophyte embeded in sporophyte in
    Solution
    The spermatophyta comprises of all those land plants that produce flowers and seed. In angiosperms, and other seed plants, gametophytes are not independent seed plants, instead they are small structures found embedded within the sporophyte.
    Therefore, the correct answer is option D.
  • Question 5
    1 / -0
    Which bryophyte is of economic importance?
    Solution
    Sphagnum is one of the most important plant genera in the world. 
    Sphagnum tends to acidify its surroundings. The acidity inhibits bacterial and fungal growth.
    Living Sphagnum plants have an impressive water holding potential, with a number of species able to hold 20 or more times their own weight in water. Given the ability to absorb large amounts of water Sphagnum plays a significant role in water regulation. Sphagnum absorbs a vast quantity of water during any heavy downpour or after snow melt and then releases much of that water in a more gradual flow over a much longer period.
    Peat is a valuable fuel like coal, consists of Sphagnum plants, which got compacted and fossilized over the past thousands of years.
  • Question 6
    1 / -0
    Adiantum is called as "walking fern", due to
    Solution
    Adiantum caudatum or the maidenhair fern is also known as the "walking fern". This is because its new plantlets grow wherever the arching leaves of the parent plant touch the ground, creating a walking effect. Shaded areas are its habitat. This is an ornamental fern found in south-east countries such as Bangladesh, Burma, India, Nepal, the Philippines, Thailand, and China.
  • Question 7
    1 / -0
    Bryophyta includes
    Solution
    Bryophytes comprises of three classes- Hepaticae (Liver worts), Anthocerotae (Horn worts) and Musci (Mosses). Mosses have erect radially symmetrical leafy plant body produced from a filamentous or thalloid juvenile stage called as protonema. The sporophyte contains large amount of green tissue and is partially dependent upon the gametophyte. e.g., Funaria (cord moss), Sphagnum (Bog or Peat moss), Polytrichum etc. 
  • Question 8
    1 / -0
    Aquatic ancestry of bryophytes is evidenced by
    Solution
    Correct option - D
    Explanation for correct option - 
    • Bryophytes are inhabitants of the land. The development of gametangia is one of the adaptations seen in the bryophytes. 
    • It provides protection to the gametes and is dependent on water for the process of reproduction and survival point to its aquatic ancestry. 
    • The flagellated male gamete needs water to transport it to the female gametes. 
  • Question 9
    1 / -0
    Reserve food of algae and fungi are
    Solution
    Algae are photosynthetic organisms that occur in most habitats. They vary from small, single-celled forms to complex multicellular forms, Food reserve is starch.
    Fungi are a diverse group of eukaryotic single-celled or multinucleate organisms that live by decomposing and absorbing the organic material in which they grow. Food reserve of Fungi is Glycogen. Hence option C is correct.
  • Question 10
    1 / -0
    About 90 percent of total photosynthesis in the world is caused by
    Solution
    Algae are microscopic organisms. which are autotrophic. They can synthesise their food by the process of photosynthesis. There are three hundred species of algae e.g., chlorella, diatoms etc and they are aquatic and photosynthesizing. Therefore they account for maximum photosynthesis. They are major producer of the 
    Thus the correct answer is option B.
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