The blue dye is obtained from the leaves of which of the following plants?

Why are pulse crops not manured with nitrogenous fertilizers?

An important fibre-yielding plant is

Match Column-$I$ with Column-$II$:
Column-$I$ (Forest Type) | Column-$II$ (Dominant Tree Species)
$(I)$ Tropical Rain Forests | $(a)$ $Shorea robusta$
$(II)$ Tropical Deciduous Forests | $(b)$ $Quercus$
$(III)$ Temperate Broad-leaf Forests | $(c)$ $Cedrus deodara$
$(IV)$ Temperate Coniferous Forests | $(d)$ $Dipterocarpus$

The richest source of vitamin $C$ is:

Which of the following fibres have high tensile strength?