Choose the incorrect pair:

Differentiate between:
$(a)$ Bract and Bracteole
$(b)$ Pulvinus and Petiole
$(c)$ Pedicel and Peduncle
$(d)$ Spike and Spadix
$(e)$ Stamen and Staminode
$(f)$ Pollen and Pollinium

Long silky hairs on the cob of maize are:

What is most commonly observed in plants bearing bisexual flowers?

Study the following statements and select the correct option:
$(i)$ Tapetum nourishes the developing pollen grains.
$(ii)$ Hilum represents the junction between the ovule and the funicle.
$(iii)$ In aquatic plants such as Water hyacinth and Water lily,pollination occurs by water.
$(iv)$ The primary endosperm nucleus is haploid.

Which one of the following statements is correct?