Pollens are be stored at which temperature
$-196^{\circ} C$
$196^{\circ} C$
$10^{\circ} C$
$0^{\circ} C$
The diagram below is a longitudinal section of an ovule of an angiospermWith which of the following structures do the contents of one pollen tube fuse with
Caruncle is derived from
Double fertilization was discovered by
Filiform apparatus is characteristic feature of