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Plant Kingdom Test - 58

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Plant Kingdom Test - 58
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  • Question 1
    1 / -0
    Mosses and ferns are
  • Question 2
    1 / -0
    Which is a character of rhodophyceae?
    Solution
    • The red algae usually reproduce vegetatively by fragmentation.
    •  They reproduce asexually by non-motile spores like monospores and sexually by non-motile gametes. Hence, Flagella are absent in Rhodophyceae.
    • So, the correct answer is "Flagella are absent'.
  • Question 3
    1 / -0
    Which is a phaeophycean alga?
    Solution
    •  The members of Phaeophyceae or brown algae are found primarily in marine habitats.
    • The common forms are Ectocarpus, Dictyota, Laminaria, Sargassum, and Fucus. 
    • While, Gelidium, Polysiphonia, porphyra and Gracilaria are red algae.
    • So, the correct answer is "Laminaria'.
  • Question 4
    1 / -0
    Which is true about mosses?
  • Question 5
    1 / -0
    Consider the following four statements and select the two wrong ones.
    (a) Sporophyte of liverworts is more elaborate than that of mosses.
    (b) Salvinia is heterosporous.
    (c) Life cycle of all seed plants is diplobiontic.
    (d) In Pinus, male and female cones are borne on different trees.
    Solution
    • The sporophyte in mosses is more elaborate than that in liverworts. Liverworts develop a small sporophyte, whereas mosses develop a comparatively long and slender sporophyte with a better spore dispersal mechanism.
    • Salvinia is a fern that is heterosporous, producing spores of differing sizes.
    • In a diplontic life cycle, the dominant free-living phase is the diploid (2n). The sporophyte is photosynthetic. The gametophytic phase is represented by single to few-celled haploid gametophytes. All seed-bearing plants, i.e., gymnosperms and angiosperms exhibit this type of life cycle.
    • The male and female cones are borne on the same tree in Pinus.

    So, the correct answer is option B.
  • Question 6
    1 / -0
    I. In Rhodophyceae, food is stored as mannitol and laminarin. II. Ovules of gymnosperms are not enclosed by ovary wall. III. Salvinia is heterosporous. IV. In diplontic life cycle, free living gametophyte represents dominant phase. Of the above statements.
    Solution
    •  In Rhodophyceae, food is stored as floridean starch.
    • Genera like Selaginella and Salvinia which produce two kinds of spores, macro (large) and micro (small) spores, are known as heterosporous.
    • The sporophyte is the dominant, photosynthetic, independent phase of the plant. The gametophytic phase is represented by the single to the few-celled haploid gametophyte. This kind of life cycle is termed as diplontic. 
    • The gymnosperms (gymnos: naked, Sperma: seeds) are plants in which
    • the ovules are not enclosed by any ovary wall and remain exposed, both
    • before and after fertilization. Hence, II and III are correct, I and IV are wrong.
    • So, the correct answer is "II and III are correct, I and IV are wrong'.
  • Question 7
    1 / -0
    To which class space alga Chlorella belongs.
  • Question 8
    1 / -0
    The alga which can be employed as food for human beings is
    Solution
    Chlorella is a genus of single-cell green algae belonging to the phylum Chlorophyta. It is spherical in shape, about 2 to 10 m in diameter, and is without flagella. Chlorella contains the green photosynthetic pigments chlorophyll a and b in its chloroplast. Through photosynthesis, it multiplies rapidly, requiring only carbon dioxide, water, sunlight, and a small amount of minerals to reproduce. It is a potential food source because it is high in protein and other essential nutrients; when dried, it is about 45% protein, 20% fat, 20% carbohydrate, 5% fibre, and 10% minerals and vitamins. It is also abundant in calories and vitamins.
    Thus, the correct answer is option A, 
  • Question 9
    1 / -0
    Find the wrong statements.
    $$(a)$$ Ulothrix and Spirogyra are filamentous forms
    $$(b)$$ Porphyra and Laminaria are fresh water algae
    $$(c)$$ Stored food is in the form of mannitol in rhodophyceae
    $$(d)$$ Chlorella and Spirulina are unicellular algae
    Solution
    • The majority of the red algae are marine with greater concentrations found in the warmer areas. They occur in both well-lighted regions close to the surface of the water and also at great depths in oceans where relatively little light penetrates. Hence, Porphyra and Laminaria are not freshwater algae.
    • The stored food is  Floridian starch which is very similar to amylopectin and glycogen in structure. Hence, Stored food is not in the form of mannitol in Rhodophyceae. Hence, b and c are wrong statements.
    • So, the correct answer is "b and c'.
  • Question 10
    1 / -0
    This provides brown colour to algae.
    Solution
    Fucoxanthin is a xanthophyll pigment. It is an accessory pigment in the chloroplasts of brown algae. It gives characteristic brown color to algae.
    Thus, the correct answer is option C.
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