Cotton plug like tissue present at the mouth of the micropyle responsible for directing the pollen tube is called
Carpophore
Trabaculae
Obturator
Translator
Double fertilization was first discovered by Nawaschin $(1898)$ in
Nuclear polyembryony is found in
For cryopreservation, plant materials are frozen at
Through which cell of the embryo sac, does the pollen tube enter the embryo sac
An event unique to angiosperms is