The typical floral formula for the family Gramineae (Poaceae) is:

Which of the following is a submerged hydrophyte?

$Acacia arabica$ is a

Given below are two statements $:$
Statement $- I :$ The arrangement of ovules within the ovary is known as aestivation.
Statement $- II :$ The mode of arrangement of sepals and petals in floral bud with respect to the other members of the same whorl is known as placentation.
In the light of the above statements,choose the correct answer from the options given below $:$

Thorns,spines and prickles work as . . . . . . in plants.

Select the correct option for the following statements:
$(i)$ Monocots possess a large shield-shaped cotyledon. It is called the scutellum.
$(ii)$ In $Ocimum$ (Tulsi),the flowers are zygomorphic (irregular).