Categorise the following plants into hydrophytes,halophytes,mesophytes,and xerophytes. Give reasons for your answers.
$(a)$ Salvinia $(b)$ Opuntia $(c)$ Rhizophora $(d)$ Mangifera

Consider the following four statements $(i), (ii), (iii)$ and $(iv)$ and select the right option for two correct statements.
Statements:
$(i)$ In vexillary aestivation,the large posterior petal is called standard,two lateral ones are wings and two small anterior petals are termed keel.
$(ii)$ The floral formula for Liliaceae is $\oplus \text{ } \text{O}\mkern-11mu{^\nearrow} \text{ } P_{(3+3)} A_{3+3} \underline{G}_{(3)}$.
$(iii)$ In pea flower,the stamens are monadelphous.
$(iv)$ The floral formula for Solanaceae is $\oplus \text{ } \text{O}\mkern-11mu{^\nearrow} \text{ } K_{(5)} C_{(5)} A_{5} \underline{G}_{(2)}$.
The correct statements are:

Match the following columns based on the position of the floral parts on the thalamus (Bentham and Hooker's classification):

Column-$I$	Column-$II$
$(A)$ Inferae	$(i)$ Hibiscus
$(B)$ Hypogyny	$(ii)$ Lemon
$(C)$ Bicarpellary	$(iii)$ Sunflower
$(D)$ Thalamiflorae	$(iv)$ Madhuca
$(E)$ Calyciflorae	$(v)$ Periwinkle
$(F)$ Epigyny	$(vi)$ Rose

Which of the following characteristics is $NOT$ associated with dicotyledonous plants?

According to the classification system of Bentham and Hooker,what is the total number of families of seed-bearing plants (Phanerogams)?

Identify the odd one out from the following types of placentation.