$Casuarina$ $equisetifolia$ is a

How many orders does the series Thalamiflorae contain?

Choose the correct sentence.

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

Draw a labelled diagram of various parts of the flowering plant.

Which of the following is a submerged hydrophyte?