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    3.

    Dinoflagellates have

    A

    Two flagella which lies longitudinally

    B

    Only one flagellum in the transverse groove between the cell plates

    C

    Only one flagellum in the longitudinal groove between the cell plates

    D

    One flagella lies longitudinally and the other transversely in a furrow between the wall plates

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    9.

    Select the wrong statement.

    A

    Diatoms are microscopic and float passively in water.

    B

    The walls of diatoms are easily destructible.

    C

    โ€˜Diatomaceous earthโ€™ is formed by the cell walls of diatoms.

    D

    Diatoms are chief producers in the oceans.

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