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In angiosperms all the four microspores of tetrad are covered by a layer which is formed by

1. pectocellulose
2. callose
3. cellulose
4. sporopollenin

Correct answer: callose

Solution

In angiosperms, the four microspores in a tetrad are surrounded by a callose wall formed during microsporogenesis. This callose layer is temporary and later breaks down, allowing the microspores to separate.

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