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Plant Kingdom Test - 56

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Plant Kingdom Test - 56
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Weekly Quiz Competition
  • Question 1
    1 / -0
    From which of the following algae, agar is commercially extracted:
    (a) Gracilaria
    (b) Fucus
    (c) Sargassum
    (d) Gelidium
    (e) Turbinaria
    Solution
    • Agar is extracted from Gracilaria and Gelidium. 
    • Agar is derived from polysaccharide; agarose, present in specific species of these algae. 
    • These algae are known as agarophytes and belong to phylum Rhodophyta. It is a red algae. 
    • The nature of agar is too gelatinous. 
    • Thus, the correct answer is option A. 
  • Question 2
    1 / -0
    Laminaria (Kelp) and Fucus (Rockweed) are examples of
    Solution
    • The large (giant) parenchymatous forms of brown algae are called kelps or sea weed or trees of seas or forest of sea. (e.g., Maccrocystic 30-60m; Nereocystis 20-30m, Laminaria 2-12m). 
    • Both contain fucoxanthin, which is brown in colour. Due to which both are grouped under brown algae.
    • Hence option B is the correct option. 
  • Question 3
    1 / -0
    Match the following.
    $$a$$Red Algae$$p$$Marchantia
    $$b$$Liverworts$$q$$Pinus
    $$c$$Walking fern$$r$$Polysiphoria
    $$d$$Gymnosperm$$s$$Adianium
    Solution
    •  The common members of red algae are Polysiphonia, Porphyra, Gracilaria, and Gelidium.
    • The liverworts grow usually in moist, shady habitats such as banks of
    streams, marshy ground, damp soil, the bark of trees, and deep in the woods.
      The plant body of a liverwort is thalloid, e.g., Marchantia
      • The pteridophytes are further classified into four classes: Psilopsida
      • (Psilotum); Lycopsida (Selaginella, Lycopodium), Sphenopsida (Equisetum)
      • and Pteropsida (Dryopteris, Pteris, Adiantum(Walking fern).
      • In gymnosperm, Roots in some genera have a fungal association in the form of mycorrhiza (Pinus). 
      • So, the correct answer is "(a)−(r),(b)−(p),(c)−(s),(d)−(q)'.
    • Question 4
      1 / -0
      Choose the wrong pair.
    • Question 5
      1 / -0
      Select the correct major pigments and stored food in different groups of algae.
      (a) Chlorophyceae - Stored food starch, major pigments Chl $$a, b$$
      (b) Phaeophyceae - Stored food laminarin, major pigments Chl $$a, b$$
      (c) Rhodophyceae - Stored food floridean starch, major pigments Chl $$a$$ and $$d$$, phycoerythrin.
    • Question 6
      1 / -0
      Mannitol is storage food in
      Solution
      Fucus belongs to class-Phaeophyceae, in which reserve food is found in form of laminarin, mannitol and oil. Chara belongs to class- Chlorophyceae, in which reserve food is found in form of starch and oil. While, Gracilaria and Porphyra are red algae and store reserved food material as floridean starch.
      So, the correct answer is 'Fucus'
    • Question 7
      1 / -0
      Leaves of moss plant possess
    • Question 8
      1 / -0
      Isomorphic alternation of generations is found in
      Solution
      • In an isomorphic alternation of generations found in some algae, for example, Ectocarpus.
      • Here, the sporophyte and gametophyte are morphologically similar or identical. 
      • So, the correct answer is "Ectocarpus'.
    • Question 9
      1 / -0
      In the diagram given below, some of the algae have been labelled $$a, b, c, d$$ and $$e$$. These algae are respectively identified as

    • Question 10
      1 / -0
      Select the correct matches.
      (a) Phaeophyceae - Mannitol
      (b) Rhodophyceae - Dictyota
      (c) Chlorophyceae - Non-motile gametes
      (d) Rhodophyceae - $$r$$-phycoerythrin.
      Solution
      • Members of the class Phaeophyceae are also known as brown algae. This group which is made up of largely multicellular algae is characterised by the brown colour due to the presence of the pigment called as fucoxanthin. Other characteristics that distinguish these are the presence of laminarin, mannitol and oils as their reserve food materials. 
      • Rhodophyceae or the red algae imparts a red colour to the thallus includes more than 4000 species. Most red algae are multicellular and marine species and contain phycoerythrin which gives the red colour.
      • Chlorophyceae (green algae) reproduce by zoospores with two identical anterior flagella.
      Therefore, the correct answer is option C. 
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