in angiosperms ,all 4 microspores of tetrad are covered by a layer which is formed by?
a-callose b-cellulose c-sporopollenin d-pectocellulose ? gv ans wid reason

Ans.  A- Callose, when the pollen wall development begins the tetrads are enclosed in callose layer. It acts as a temporary wall to prevent the products of meiosis from fusion and cohesion and so its dissolution results in the release of free spores.
 

 

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