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Plant Kingdom Test - 88

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Plant Kingdom Test - 88
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The only asexual algal spores formed during favourable conditions is
    Solution
    Zoospores, bear two unequal flagella, one of which is directed forward, the other backward.  Zoospores are produced asexually in a sporangium.
  • Question 2
    1 / -0
    By which of the following methods an algae can perennate under unfavourable condition?
    Solution
    Zoospore is a motile asexual spore that uses a flagellum for locomotion. Also called as swarm spore, these spores are created by some algae, bacteria and fungi to propagate themselves.
    The freshwater and subaerial algae are unprotected and frequently exposed to risk of desiccation and extremes of temperature. Marine algae live in conditions where variations in external environmental conditions of life are rare but still they are exposed to tidal fluctuations. The main methods of perennation in freshwater and subaerial algae are akinetes, aplanospores, palmella stage, cysts, oospore, hormospores, hypnospores and tubers.  
  • Question 3
    1 / -0
    One of the following can flourish at high temperature of 87$$^o$$C.
    Solution
    Throughout the world, the most frequent algae of hot springs are the Cyanophyta. The hotsprings are mostly alkaline and so it appears that the tolerance of extreme temperatures is associated with this factor.
    Therefore, the correct answer is option D.
  • Question 4
    1 / -0
    Isomorphic alternation of generation is found in _______.
  • Question 5
    1 / -0
    "Fire algae" belongs to group
    Solution
    Pyrrophyta is reddish brown unicellular dinoflagellates with/without cellulosic cell wall. Dinoflagellates are the bioluminescent algae. They have pigment luciferin which is acted upon by the enzyme luciferase causing production of light without any heat, thus the name fire algae. 
    Euglenophyta are unicellular autotrophic algae characterized by absence of cell wall and presence of pellicle, they are not bioluminescent. 
    Bacillariophyta includes unicellular autotrophic algae (diatoms) with characteristic silicon cell wall and are responsible for formation of diatomaceous earth. 
    Rhodophyta includes mostly multicellular algae (red algae) characterized by presence of calcium carbonate in cell wall which forms coral reefs.
    Therefore, the correct answer is option A.
  • Question 6
    1 / -0
    Living fossil pteridophyte is
    Solution
    The whisk fern of the Psilotum species is a living fossil from the time before the dinosaurs. It has leafless whisk-like branches upward and is found in the tropical regions around the world. It is descendant from the first vascular land plants, the Rhyniophytes, that appeared on earth around 400 million years ago. Its primitive nature is highlighted by its having flagellated sperm and absence of roots and leaves, unlike the more advanced flowering plants. Its lack of seeds in the reproductive cycle is another factor explaining its ancient evolutionary origin. Thus the correct answer is option B.
  • Question 7
    1 / -0
    Batrachospermum (frog spawn alga) is
    Solution
    Batrachospermum (frog spawn alga) is exceptional fresh water form of Rhodophyceae. This is found in slow running streams and banks of lakes or ponds. The plants are blue-green, olive green, violet or reddidh in colour.
  • Question 8
    1 / -0
    In Chlamydomonas, meiosis occurs in
    Solution
    In  Chlamydomonas, the zygospore, after usual rest period, germinates on the arrival of favourable condition. It undergoes meiosis to form 4 or rarely 8 biflagellate zoospores. 
  • Question 9
    1 / -0
    Monoecious plant of Chara shows occurrence of
    Solution

    Chara reproduces vegetatively and sexually. Vegetative reproduction takes place by tubers, amylum stars and secondary protonema. The fructifications for sexual reproduction are globule or antheridium (male) and nucule or archegonium (female) or oogonium. The antheridia and archegonia or oogonia may occur on separate plants called dioecy, together on the same plant conjoined- monoecy or separately on the same plant -sejoined monoecy. After fertilization, the zygote develops into an oospore.

  • Question 10
    1 / -0
    Which of the following is a copper moss?
    Solution
    A moss that grows on copper-rich rocks. Such mosses, including species of Mielichhoferia, Dryptodon, and Merceya, can survive levels of copper far in excess of those lethal to other mosses.
    So, the correct answer is option C.
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