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NEET Biology Plant Kingdom Question Bank Critical Thinking

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    When the sperms of Funaria and Pteris are put together near the archegonia of Pteris, only the sperms of Pteris readily enter the archegonia and reach the egg. The reason being that                                                          [CBSE PMT 1989, 94]

    A)            Sperms of Funaria are killed when mixed with sperms of Pteris

    B)            Archegonia of Pteris secrete a substance with repels sperms of Funaria

    C)          Archegonia of Pteris secrete a chemical substance which attracts sperms of Pteris chemotactically

    D)            Sperms of Funaria are less motile

    Correct Answer: C

    Solution :

               Because archegonia of Pteris secrete a chemical malic acid which attracts only sperms of Pteris chemotactically.


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