In $Opuntia$ (prickly pear),the leaf spines are a modification of the .......

Select the correct pair regarding phyllotaxy:

Function of petiole is $:-$

The main function of a leaf is:

Identify the correct terms for the following analogy-based question:
$(i)$ Leaf is attached to the stem by: Leaf base :: The swollen leaf base is called: ............
$(ii)$ In Neem: Pinnately compound leaf :: In Silk cotton: ............

Storage leaves occur in