Which of the following provides the most durable wood?

The following diagrams represent the type of placentation in an ovary. Identify the correct combination of labelling for $1 - 2 - 3$.

What is the scientific name of maize?

Match List-$I$ with List-$II$.

List-$I$	List-$II$
$A$. Marginal placentation	$I$. Argemone
$B$. Axile placentation	$II$. Tomato
$C$. Parietal placentation	$III$. Primrose
$D$. Free central placentation	$IV$. Pea

Choose the correct answer from the options given below:

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

What is the scientific name of $Bougainvillea$ $spectabilis$?