Photosynthetic roots are recorded from

In humid climate, presence of spines in shrubs is

$A$. Citrus and Ricinus have synandrous condition.
$B$. In epitepalous condition, the cohesion occurs bewteen tepal and filament of stamen.
$C$. Tetradynamous condition consists of two long and four short stamen filaments.

Which pair of the following plants represents the condition of modification of stipules into spines?

Identify below figure.

In Banana, true stem is underground. The stem like structure outside soil is formed by