Polysiphonous pollen grains are found in........

Match the following:

Column-$I$	Column-$II$
$(p)$ Intine	$(v)$ Long structure
$(q)$ Exine	$(w)$ Nutrition to pollen grain
$(r)$ Pollen tube	$(x)$ Sporopollenin
$(s)$ Tapetum	$(y)$ Pectin,cellulose
	$(z)$ Glycogen

Study the following statements and choose the correct option.
$I-$ Tapetum nourishes the developing pollen grains.
$II-$ Hilum represents the junction between ovule and funicle.
$III-$ In aquatic plants such as water hyacinth and water lily,pollination is by water.
$IV-$ The primary endosperm nucleus is triploid.

Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.

Normally,the number of chromosomes in the nuclei of gametes that fuse at fertilization are

Select the incorrect statement from the following.