Explain types of gynoecium.

When the anthers do not possess pollen grains at all, these are known as

Tetradynamous condition is related to

Divergent multicostate reticulate venation is found in leaves of

Which type of placentation is formed in plants which having vaxillary aestivation ?

Differentiate between :

$(a)$ Bract and Bracteole

$(b)$ Pulvinus and Petiole

$(c)$ Pedicel and Peduncle

$(d)$ Spike and Spadix

$(e)$ Stamen and Staminoid

$(f)$ Pollen and Pollenium