Which of the following plant families has $polysiphonous$ pollen grains?

Which of the following statements is applicable to all flowering plants?

The life cycle of an angiosperm is given below. What are $P, Q$ and $R$?
$P \quad Q \quad R$

The long, hair-like strands that emerge from the young cob of maize are

Choose the correct option ($T$ = true,$F$ = false).
- If zygote develops outside the body,the animal is oviparous.
- In flowering plants,zygote is formed inside the ovule.
- During embryogenesis,embryo shows both cell division and cell differentiation.
- In flowering plants,the ovary develops into the fruit.

Match the following:

Column-$I$	Column-$II$
$(1)$ Grasses	$(P)$ Prevent autogamy and geitonogamy
$(2)$ Hydrilla	$(Q)$ Wind pollination
$(3)$ Cleistogamous flower	$(R)$ Water pollination
$(4)$ Papaya	$(S)$ Autogamy