Question

Passiflora is an example of
(a) Stem tendril
(b) Phylloclade
(c) Thorn
(d) Cladode

Answer 1

Passiflora is also known as passion vines or passion flowers. These flowers are evergreen climbers with exotic flowers. The vines of these plants wrap around the support. The support helps them to grow vertically.

Complete solution:
Passiflora is an example of stem tendril.
A thin, thread-like structure used by climbers for support, attachment, and cellular invasion by parasitic plants generally by coiling around the suitable host found by touch is called a stem tendril. Lamina or blade is absent, but still, they can photosynthesize.
These tendrils are chemosensitive, which helps them in finding directions for their growth.

Additional information:
A phylloclade is an aerial stem or branch modification. The stem is modified into a succulent, green, flat or cylindrical structure in phylloclades. It arises in the axil of a leaf and leaves a scar when it falls off. Phylloclades bear a succession of nodes and internodes at long or short intervals.
A thorn is a sharp, modified stem in the leaf's axil, where a branch would develop.
A cladode is an aerial branch modification. Its branch is also modified into a succulent, green, flat, or cylindrical leaf-like structure. Cladodes may appear in clusters or singly in the axil of a scale leaf. It has mostly one or rarely two internodes.

So, the correct answer is 'Stem tendril'.

Note:
A tendril may be of two types:- Stem tendril and Leaf tendril.
Stem tendril is a modified stem, and Leaf tendril is a modified leaf or leaflet.
Tendrils are seen in climbing plants.