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Biological Classification Test - 25

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Biological Classification Test - 25
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  • Question 1
    1 / -0
    Mycelium in Albugo is
    Solution
    Albugo is an obligate parasite which attacks mostly crucifers like turnip, mustard, radish, cabbage, cauliflower etc. The disease caused by Albugo is commonly known as white rust because it appears in the form of shiny, white, smooth irregular patches (pustules) or blisters on the leaves, stems and other aerial parts of the plant. Its thallus is eucarpic and mycelial. Hyphae are intercellular, coenocytic, aseptate and profusely branched.
    Thus, the correct answer is option B.
  • Question 2
    1 / -0
    Yeast produces an enzyme complex that is responsible for fermentation. The enzyme complex is
    Solution
    During fermentation, carbohydrates like starch or sugar are converted to an alcohol or acid. Zymase is the enzyme complex produced by yeast which contains enzymes that carry out digestion of carbohydrates to form alcohol. 
    So, the correct answer is option D.
  • Question 3
    1 / -0
    Which statement is incorrect for Albugo
    Solution
    Albugo is an obligate parasite which attacks mostly crucifers like turnip, mustard, radish, cabbage, cauliflower etc. The disease caused by Albugo is commonly known as white rust. It reproduces by both asexual and sexual methods. The asexual reproduction takes place by conidia, condiosporangia or zoosporangia. The sporangia germinate into zoospore either directly or indirectly depending on temperature conditions. The zoospores are uninucleate, slightly concavo-convex and biflagellate. In sexual reproduction, The antheridium and oogonium are formed near each other on hyphal branches. Antheridium is elongated, multinucleated and club-shaped structure. Oogonium is multinucleate and spherical structure. Both antheridium and oogonium do not have flagella.
    Thus, the correct answer is option A.
  • Question 4
    1 / -0
    Name the species which can cause white rust of cruciferae.
    Solution
    Cruciferous vegetables in Brassicaceae family (Mustard) are attacked by white rust disease, which is caused by Albugo candida. An example for this is the white smut in radish. It causes white blistering on the underside of affected leaves.
    Thus, the correct answer is option D.

  • Question 5
    1 / -0
    Mycelium of Mucor/Rhizopus is
    Solution
    The vegetative body in Mucor/Rhizopus is a coenocytic which forms white and cotton growth on the substratum because they lack cross walls or septa.
  • Question 6
    1 / -0
    In Albugo, the food reserve is mostly
    Solution
    Albugo belongs to the class oomycete. Albugo the only genus of family Albuginaceae is represented by more than 25 species. Reserve food material is in the form of oil drops and glycogen bodies. Hence the correct answer is option A. 
  • Question 7
    1 / -0
    Which of the following statements is wrong about lichens?
    Solution
    Lichens grow extremely slowly often less than a millimeter per year. Anyone thallus may be many decades old. The outer edge is probably the only active component of the thallus unless the lichen has started to overgrow itself. The inner part is commonly inactive. The slow rate of growth and the reliance on minerals in rain or high humidity has consequences for the survival of lichens in polluted environments and some lichens are thought to be among the oldest living things on Earth.
  • Question 8
    1 / -0
    Cladonia rangiferina  is a
    Solution
    Cladonia rangiferina, commonly called as reindeer moss, belonging to the Cladoniaceae family is a light-coloured, fruticose lichen. It is not a moss; it is lichen, which is a combination of fungus and algae sharing a symbiotic relationship. It is commonly found in an extremely cold environment like alpine tundra because it has the ability to convert sunlight into food in low temperature and low light conditions. Its tissue is not easily damaged by frost. Thus, the correct answer is option B.
  • Question 9
    1 / -0
    Lichens are well known combination of an alga and a fungus where fungus has
    Solution
    Lichen is a stable symbiotic association between a fungus and algae. The combined life form has properties that are very different from the properties of its component organisms. Lichens come in many colors, sizes, and forms. The properties are sometimes plant-like, but lichens are not plants. 
  • Question 10
    1 / -0
    Fungal partners of a lichen are commonly
    Solution
    Lichens are stable, self-supporting associations between fungi and photobionts. The fungi are most commonly ascomycota. A few Holobasidiomycetes are known to form the association. The photobionts are either algae or cyanobacteria. The algae may be single celled or rarely filamentous.
    So, the correct answer is 'Ascomycetes'
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