NEET 2002 Biology question

In Angiosperm all the four microspores of tetrad are covered by a layer which is formed by : -

(1)Pectocellulose
(2)Callose
(3)Cellulose
(4)SporopolleninCorrect

Answer: (4)

Solution

After meiosis of the microspore mother cell the four microspores of the tetrad lie within a temporary callose wall that is dissolved by callase when the microspores separate. Each microspore then develops a tough, resistant outer wall (exine) made of sporopollenin, the most resistant organic material known, which

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Question ID VK-089089