Generally in the wall of the anther lobes how many middle layers are formed
Seven
Three
Six
Nine
A typical angiosperm anther is
Pollen grains are released from
$A$ : Each cell of the sporogenous tissue is capable of giving rise to a microspore tetrads.
$R$ : Most abundant microspore tetrads is the product of simultaneous cytokinesis.
The innermost wall layer of anther
Members of which plant family, pollen grains maintain viability for months ?