Question

Stems have played and important role in plant evolution. Their functions have changed and evolved over a period of time. From the list given below (i to iv), identify the functions performed by stems in different types of plants.
(i) Photosynthesis
(ii) Support
(iii) Storage
(iv) Spread and dispersal of plants

• A. (i) and (ii) only
• B. (i), (ii) and (iii) only
• C. (i), (ii), (iii) and (iv)
• D. (ii), (iii) and (iv) only

Answer 1

The correct option is C (i), (ii), (iii) and (iv)

In some plants, the stem has been modified to perform different functions. These are the adaptations shown by the plants due to adaptation and evolution.

In dessert plants, the stem become green and flat to perform photosynthesis.

In climbers, the stem tendrils cling or wound on the other plants to provide support.

In rhizome and tubers, the food is stored in the stem.

In plants like runners which spread on the land, the seeds or the spores are dispersed. This helps in the dispersed growth of the plants.

Thus, the correct answer is option C.