Question

Tetrasporic embryosac is one in which

• A. Four microspores form the embryosac
• B. Four megaspore mother cells form the embryosac
• C. Four megaspores form the embryosac
• D. Four microspore mother cells form the embryosac

Answer 1

Answer: (C)

Four megaspores form the embryosac

The three nuclei at the end of the cell near the micropylar become the egg apparatus, with an egg cell in the center and two synergids. At the other end of the cell, a cell wall forms around the nuclei and forms the antipodals. Therefore the resulting embryo sac is a seven celled structure consisting of one central cell, one egg cell, two synergid cells, and three antipodal cells. The bisporic and tetrasporic patterns undergo varying processes and result in varying embryo sacs as well. In tetrasporic embryosac, embryosac develops from four megaspore nuclei.