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Plant Kingdom Test - 86

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Plant Kingdom Test - 86
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  • Question 1
    1 / -0
    Dichotomous branching is found in
    Solution
    • Two branches of equal thickness are formed at every point of branching in the case of dichotomous branching.
    • It is a distinctive feature of liverworts (division Bryophyta), e.g. Riccia and  Marchantia etc.
    • As you can see in the above diagram, they do not have true roots, stems, or leaves. Instead, they have an above ground leaflike structure, known as a thallus that is dichotomously branched.

    So, the correct answer is option C.

  • Question 2
    1 / -0
    Choose the wrong pair from the following.
    Solution
    Marchantia ( common liverwort) belong to class Hepaticopsida.
    Selaginella ( spike mosses) belong to class Lycopsida.
    Dryopteris (wood fern) belong to class Pteropsida. 
    Equisetum (horsetail) belong to class Sphenopsida. 
    Bryopsida is the largest class of true mosses. Anthoceros is a genus of hornworts that belongs to class Anthocerotaceae.
    So, the correct answer is option C.
  • Question 3
    1 / -0
    Agranal chloroplast are found in
    Solution
    Chloroplast has a coin-shaped structure which is known as thylakoids which are placed one above the another to form stacks known as grana. Certain chloroplasts do not form grana. E.g., chloroplasts in guard cells and in algal cells. Due to nuclear gene mutation, grana stacking in both lower and higher plants is affected.
    So, the correct answer is option C.
  • Question 4
    1 / -0
    Non motile, greatly thickened asexual spore in Chlamydomonas is known as
    Solution
    Chlamydomonas is a motile unicellular alga and belongs to the genus of green algae. This is found in stagnant water, freshwater, seawater, damp soil and even in snow. Asexual reproduction in algae takes place through the production of spores. When zoospores lose their motility these are referred to as aplanospores and in certain green algae these aplanospores have thickened walls and are known as hypnospores. These are resting spores released in the dormant state. 
    Therefore, the correct answer is option C.
  • Question 5
    1 / -0
    Sea weeds are important source of
    Solution
    Seaweeds are among the most potent accumulators of iodine. Kelps of the Laminaria genus were identified as a major iodine source. Iodine is found at low concentrations throughout the ocean waters, many types of seaweed accumulate the element in very high levels. It has been suggested that seaweeds could be an important route to transfer iodine to the atmosphere. 
  • Question 6
    1 / -0
    Which of the following plant groups lack lignified cell walls in its cellular structure?

  • Question 7
    1 / -0
    There is symbiotic algae in the secretory cells of Hydra. It is
    Solution
    Green Hydra (Hydra viridissima) contains in its gastrodermal myoepithellial cells, the endosymbiotic unicellular green algae and forms a stable symbiosis. Endosymbiotic algae in freshwater invertebrates are commonly named Zoochlorellae. The term Zoochlorellae was given by Brandt (1882), who described the green bodies - coccoid unicellular Chlorella, which includes also endosymbiotic algae. Zoochlorellae is used as a generic term, that covers all green algae, that form endosymbiotic associations in freshwater invertebrates.
    Thus, the correct answer is option C.
  • Question 8
    1 / -0
    The alga, Chara is called as stone wort because its body has
    Solution
    Chara plants are also known as stoneworts - stone plants. The 'stony' part of the plant is composed of calcium carbonate in the form of hard crystalline calcite that impregnates cell walls. Calcite is produced by diverse groups of organisms, from the unicellular algae to shelly invertebrates. The calcite protects these organisms from herbivores and predators. The calcite-impregnated walls of Chara make this plant less appealing to grazers.
    Thus, the correct answer is option A.
  • Question 9
    1 / -0
    The members of algae found in littoral zone is
    Solution
    Ectocarpus is widely distributed massive alga which grows on rocks or larger seaweeds in littoral and supra-littoral zone.
    Thus, the correct answer is option C.
  • Question 10
    1 / -0
    Which of the following is a common character shown by both bryophytes and pteri-dophytes?

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