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Plant Kingdom Test - 85

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Plant Kingdom Test - 85
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  • Question 1
    1 / -0
    Isomorphic alternation of generations is found in
    Solution
    The tetraspores are haploid cells that produce the haploid sexual plants which bear antheridia or oogonia on their germination. Such, type of life-cycle bears only two phases, i.e., diploid and haploid and is known as biphasic life-cycle. This type of alternation of generations is also known as isomorphic or homologous. The life-cycle of Ectocarpus is also of isomorphic type, where the gametophyte and sporophyte are alike. 
    Thus, the correct answer is option D.
  • Question 2
    1 / -0
    Red eye spot containing haematochrome is meant for
    Solution
    The Chlamydomonas has sensory spots which are red in color due to the presence of hematochrome. The red color carotenoids reflect light and photoreceptors (ChR1 and ChR2) helps in photoreception. It helps in phototaxis movement. So, the correct answer is option C.

  • Question 3
    1 / -0
    Smallest plant which contain green pigment such as higher green plant is
    Solution

    Chlorophyceae make up an extremely large and important class of green algae. Members may be unicellular, colonial, or filamentous. Cells of unicellular and colonial chlorophyceans may have two or more flagella. There are about 2,650 living species of chlorophyceans. The main features of the class (and most plants) are the use of starch as the principal food reserve and the green chloroplasts with chlorophylls a and b. Inspite of plant characteristics, this algal group is not directly related to early land plants. The most complex of the class are the filamentous members, some of which exhibit features that are seen primarily in plants. Despite this similarity the class is not believed to have been the evolutionary source of plants.

  • Question 4
    1 / -0
    Algae are in the same major group of plants, so are the
    Solution
    Algae and fungi both belong to thallophytes.
    Characteristics of algae:-
    The plant body may be unicellular to a large robust multicellular structure. The multicellular complex thalli lack vascu­lar tissue and also show little differentiation of tissues. The sex organs are generally unicellular but, when multicellular, all cells are fertile and in most cases, the entire structure does not have any protection jacket. The zygote undergoes further development either by mitosis or meiosis, but not through embryo formation. Plants having distinct alternation of genera­tions. Both gametophyte and sporophyte generations — when present in the life cycle are independent.
  • Question 5
    1 / -0
    During unfavourable conditions Chlamydomonas  forms a colonial aggregate called
    Solution

    Under certain conditions, Chlamydomonas changes from a motile organism to a non-motile form referred to as palmella stage. In this non-motile phase, vegetative divisions are prominent and motility is suppressed until special motile reproductive cells are formed. 

  • Question 6
    1 / -0
    Eusporangiate fern is produced from
    Solution
    In Eusporangiate ferns there is a large sporangium developed from several initial cells producing many spores. In some cases sporangium fuse to form Synangium. E.g., Psilotum, Selaginella. Eusporangiate ferns are vascular spore plants, whose sporangia arise from several epidermal cells. Typically these ferns have reduced root systems and sporangia, that produce large amounts or spores. 
  • Question 7
    1 / -0
    Which one of the following is a true moss?
    Solution
    Bryopsida is also called as true moss e.g., Sphagnum. Peat moss is a dead form of Sphagnum moss. Peat moss adapts to its environment by creating its own habitat. It holds rainwater, so it cannot drain and that creates a bog, hence called as bog moss. Bog, type of wetland ecosystem characterized by wet, spongy, poorly drained peaty soil.
    Club moss is pteridophyte, while reindeer moss and Irish mosses are lichens.
    Thus, the correct answer is option D.
  • Question 8
    1 / -0
    In which of the following pyrenoids are present?
    Solution
    Pyrenoid is an aggregate of protein, almost exclusively Ribulose 1,5-bisphosphate carboxylase/oxygenase and some minor proteins.These are defined as bodies in chloroplasts that reacted strongly with protein stains. They are generally absent in Bryophytes but present in Anthoceros.
  • Question 9
    1 / -0
    Batrachospermum is found in
    Solution
    Batrachospermum, genus of freshwater red algae ranging in colour from violet to blue-green. This alga is found in shaded areas of reservoirs that contain fresh water. Batrachospermum will not live in water that is constantly exposed to the sun. It lives only in cold water that has low levels of organic materials. Thus it is an indicator of "clean water." It creates a problem when large growths in irrigation canals slow the flow of water. 
  • Question 10
    1 / -0
    Select  the correct match from the options given below.
    (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.
    Therefore, the correct answer is option E.
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