Male Gametogenesis Sequence — NEET Biology

Correct answer: A — I → II → III → IV → V → VI

The question asks for the correct developmental sequence from early microsporangium development to pollen grain release. According to NCERT: I. 'When the anther is young, a group of compactly arranged homogenous cells called the sporogenous tissue occupies the centre of each microsporangium.' This is the initial step. II. 'As the anther develops, the cells of the sporogenous tissue undergo meiotic divisions to form microspore tetrads.' This follows the differentiation of sporogenous tissue. III. 'As the anthers mature and dehydrate, the microspores dissociate from each other and develop into pollen grains.' This occurs after tetrad formation. IV. The pollen grain then develops its prominent two-layered wall, exine and intine, which is a structural maturation step. V. 'When the pollen grain is mature it contains two cells, the vegetative cell and generative cell.' This is a further stage of pollen grain maturation. VI. 'Inside each microsporangium several thousands of microspores or pollen grains are formed that are released with the dehiscence of anther.' This is the final step of release. Therefore, the correct sequence is I → II → III → IV → V → VI.