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Biology Test 16...

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  • Question 1
    4 / -1

    A bacterium divides every 30 minutes. If a culture containing 106 cells/ml is grown for 180 minutes, what will be bacterial cell concentration after that period :-

  • Question 2
    4 / -1

    Bacteria that fix CO2 without using light energy as source are :

  • Question 3
    4 / -1

    Which of the following is Xanthomonas related ?

  • Question 4
    4 / -1

    Which of the following statements is/are correct?

    (I) Mycoplasma has no cell wall

    (II) Mycoplasma is the smallest living organism

    (III) Mycoplasma cannot survive without O2.

    (IV) Mycoplasma are pathogenic in animals and plants

    (V) True sexuality is not found in bacteria

    (VI) A sort of sexual reproduction by adopting a primititive DNA transfer from one bacterium to the other occur

  • Question 5
    4 / -1

    Column–I  Column-II
    (I) Streptomyces (A) Nitrogen fixation
    (II) Rhizobium (B) Source of antibiotics
    (III) Nitrosomonas (C) Vinegar synthesis
    (IV) Acetobacter (D) Nitrification

    Which of the combinations is correct ?

  • Question 6
    4 / -1

    Which of the following kingdom forms a link with the others dealing with plants, animals and fungi?

  • Question 7
    4 / -1

    'Red tides' are due to -

  • Question 8
    4 / -1

    Flexibility of Euglenoids body is due to :

  • Question 9
    4 / -1

    (A) Marine form of Amoeba have silica 

    (B) Silica present in Diatom

    (C) Lichens are pollution indicator

    (D) Citric acid can produced form Aspergillus niger.

  • Question 10
    4 / -1

    Select incorrect matches from the followings :-

      Column I Column II
    (i) Haplontic life cycle Gametic meiosis
    (ii) Diatoms Bioluminescence
    (iii) Frustule Silicated cell wall
    (iv) Slime mould  Plasmodium

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