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(B) The pollen grain is a spherical structure that possesses a two-layered wall. $1$. The outer hard layer is called the exine, which is made up of sp

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$A-Exine, B-Intine$

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(B) The pollen grain is a spherical structure that possesses a two-layered wall. $1$. The outer hard layer is called the exine, which is made up of sporopollenin, one of the most resistant organic materials known. $2$. The inner thin and continuous layer is called the intine, which is composed of cellulose and pectin. Therefore, $A$ refers to the exine and $B$ refers to the intine.

Pollens have two prominent walls which are ... $A$... and ... $B$ .... Here $A$ and $B$ refers to

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