Question

The things is common between gourd, passion flower and grapevine is
A. They all have roots modified to store food.
B. They all have prop roots.
C. They all have tendrils.
D. They all have leaves modified as thorns.

Answer 1

Hint:
Tendrils are the plant organ specialized to anchor and support veining stems.
The tendrils may be modified leaves, leaflets, leaf tips, or leaf stipules.
They may sometimes be derived as the modified stem branches.

Complete answer:
The climbers such as gourd, grapevine and passion flower have weak stems.
Hence the stems of these plants develop threadlike structures called the tendrils.
 The tendrils are the aerial stem modification.
When they come in contact with the solid support they coil around it and hence support these plants in climbing. They provide support to plants.

Therefore, the correct answer is option C.

Additional information:
The tendrils are slender threadlike strands which are usually produced from the node of stem.
They help a vine or other plant to climb.
 Its anatomy may be of the stem tissue or of the leafstalk tissue.
The very common examples of the tendril-producing plants are the grapes and the melon family , etc.
The tendrils are the prehensile and also sensitive to contact.
The strong mechanical tissue develops in the tendrils therefore rendering them strong enough to support the weight of the plant.
In addition to their twining character, some of the tendrils produce the terminal enlargements that, on contact with a firm surface, flatten and secrete an adhesive, firmly cementing the tendril to the substrate.

Note:
The tendrils are very sensitive to touch.
This results in the tendril to circle around the object and thus cling to it.
The plant climbs over other plants to reach sunlight without wasting energy on growing their own self-supporting shoots.
Some climbers twine their stems in the particular direction.