Question

____________ _ consist of food-storing scale leaves enclosing the stem.
A. Bulbs
B. Tubers
C. Both A & B
D. None of the above

Answer 1

Hint: Scale leaves normally dry, thin, stalkless, and membranous, with a brownish or colorless appearance. The scale leaves functions to protect the axillary bud which they bear in their axil. Sometimes, as in onions, the scale-leaves are thick and fleshy and their function is to store up water and food. In parasites, saprophytes and underground stems, the scale leaves are common.

Complete answer:
Option A Bulbs: A short stem in structure with fleshy leaves or leaf bases that function as food storage organs during the dormancy period is known as bulbs. The leaf bases of bulbs, which are also known as scales, generally do not support leaves. But these leaf bases contain food reserves which enable the plant to survive adverse conditions.
Hence option A is the correct answer.
Option B Tubers: The tubers are enlarged structures that are found in some plant species which are used as storage organs for nutrients. These comes useful for the plant's perennation which provide energy and nutrients for regrowth during the next growing season, and as a means of asexual reproduction. Tubers are not scale leaves enclosing the stem.
Hence option B is not correct.
Option C A&B: Since option A is correct and B is not correct.
So, option C is wrong.
Option D None of the above: Here, option A is the correct answer.
Hence option D is wrong.

So, Option A Bulbs is the correct answer.

Note:
There is a vegetative growing point or an unexpanded flowering shoot at the center of the bulb. The base of the bulb is formed by a reduced stem, and from this basal plate, the plant growth occurs. From the underside of the base, roots emerge and new stems and leaves emerge from the upper side. The tunicate bulbs have a membranous and dry outer scale. This protects the continuous lamina of fleshy scales in them.