In angiosperms,the four microspores of a tetr | vedclass

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(B) In angiosperms,during microsporogenesis,the microspore mother cell $(MMC)$ undergoes meiosis to form four haploid microspores,which are arranged i

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Callose

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(B) In angiosperms,during microsporogenesis,the microspore mother cell $(MMC)$ undergoes meiosis to form four haploid microspores,which are arranged in a cluster called a microspore tetrad.These four microspores are held together by a special layer of polysaccharide known as $Callose$.As the anther matures and dehydrates,the enzyme $callase$ (secreted by the tapetum) degrades this $Callose$ layer,allowing the microspores to dissociate and develop into pollen grains.

In angiosperms,the four microspores of a tetrad are covered by a layer which is made up of:

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