Question

Eight nucleate embryo sacs are

• A. Always monosporic
• B. Sometimes monosporic, bisporic and tetrasporic
• C. Always tetrasporic
• D. Always bisporic

Answer 1

The correct option is B

Sometimes monosporic, bisporic and tetrasporic

Depending on the number of megaspore nuclei, the development of embryo sac can be monosporic, bisporic or tetrasporic. When only one megaspore nucleus forms the embryo sac, the development of the embryo sac is said to be monosporic. When two megaspore nuclei form the embryo sac, the development of the embryo sac is said to be bisporic. When all the four megaspore nuclei form the embryo sac, the development is said to be tetrasporic.