Which tissue constitutes the pulvinus of a leaf?

You have heard about several insectivorous plants that feed on insects. Nepenthes or the pitcher plant is one such example,which usually grows in shallow water or in marshy lands. What part of the plant is modified into a pitcher? How does this modification help the plant for food even though it can photosynthesize like any other green plant?

Name the plant having reticulate venation.

The bladder of $Utricularia$ and pitchers of $Nepenthes$ are modifications of

Heterophylly can be observed in
$I.$ Cotton
$II.$ Coriander
$III.$ Larkspur
Select the right option.

Petiole is modified into tendril in