Plz solve Q1

Solution:

Ans. Option 4) is correct: Tapetum

Tapetum is the innermost layer of the microsporangium. It provides nourishment to the developing pollen grains. During microsporogenesis, the cells of tapetum produce various enzymes, hormones, amino acids, and other nutritious material required for the development of pollen grains. It also produces the exine layer of the pollen grains, which is composed of the sporopollenin. 

Tapetum is the innermost wall of microsporangium. The tapetal cells are large and become filled with dense protoplasmic contents as well as nutrients as the microspore mother cell grows. Tapetal cells either become multi-nucleate or their nucleus becomes polyploid due to endoploidy. 

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