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Biology Test 238

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Biology Test 238
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Weekly Quiz Competition
  • Question 1
    4 / -1

    The consumer-decomposer protists (slime moulds) resemble with

  • Question 2
    4 / -1

    The cell wall of diatoms is composed of

  • Question 3
    4 / -1

    Phytoalexins are secreted in the cell of host plant due to

  • Question 4
    4 / -1

    Majority of lichens are made of

  • Question 5
    4 / -1

    Tikka disease of groundnut is due to

  • Question 6
    4 / -1

    Coenocytic fungi which lack motile spores and produce zygospores belong to

  • Question 7
    4 / -1

    The condition, where plasmogamy, karyogamy and haploidization do not occur at specific stages in the life cycle is known as

    Solution

    A possible mechanism that provides an answer to this question is the parasexual cycle. This is a process in which plasmogamy, karyogamy and haploidization takes place, but not in any particular place in the thallus nor at any specific period during its lifecycle.

     

  • Question 8
    4 / -1

    Pollen grain of Cycas are shed at which stage ?

    Solution

    Pollen grain is the first cell of the gametophyte. The microspore germinates in situ i.e., while within the microsporangium. Each microspore divides asymmetrically into a 2-cells: a smaller prothallial cell and a larger antheridialcell. The prothallial cell does not divide further while the antheridial cell divides into a smaller generative cell near the prothallial cell and a larger tube cell. Finally pollination takes place at 3-celled stage.

     

  • Question 9
    4 / -1

    Ulothrix occurs in

    Solution

    Some fresh water forms of algae are present in slow running waters for example Ulothrix, Cladophora, Oedogonium.

     

  • Question 10
    4 / -1

    Non-flagellated thick walled spores of Ulothrix are called as

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