Question

Bulb helps the vegetative reproduction in
A)Tomato
B)Potato
C)Rye
D)Onion

Answer 1

Bulbs are underground structures which perform the function of storage. These bulbs are covered by layers of fleshy leaves. At the last stages, a lateral bud is formed which forms smaller bulbs which are attached to the base of the parent bulb. These smaller bulbs can be separated and planted.

Complete answer:
Vegetative reproduction is a type of asexual reproduction in which new plants are grown from part or specialized structures of the parent plant.

Some methods of vegetative reproduction are :
1.By scaly bulbs: Reproduction by this method occurs in tulip daffodil onion and garlic. The stem shortens to disc known as basal plate and roots arise from the basal plate. Axillary buds are formed at the nodes and give rise to new bulbs. The stem is reduced and leaves are fleshy which store food. Hence option D) is correct.
2.By epiphyllous bud: shoot buds are formed with the support of leaves. These buds then form roots and as they fall in the ground they lead to the formation of new plants. This occurs in Bryophyllum
3.By Corms: Basal plate without leaf base is known as a corm. Roots emerge from the lower surface. Axillary buds are formed on the concave surface along with apical buds and this forms the shoot system.
4.By Tubers: Rhizomes are underground leafless stems that penetrate the layers of soil and become swollen to produce tubers. Many axillary buds are present on the surface and are known as eyes. These eyes give birth to new plants. Example potato
5.By Stolons: Leafless branches are produced above the ground. Apical buds are produced on this branch. These branches weigh down in the ground and produce roots and the new plant is produced. Example of strawberry.
6.By sucker: Root sprouts are produced in which cytokinins accumulate and lead to shooting formation. These shoots grow upward and give rise to the new plant.

Hence, the correct answer is option (D)

Note: Vegetative reproduction by bulb occurs in onion. Bulbs are underground structures covered by scaly leaves which perform the function of storage. Two types of bulbs are present. Tunicate bulbs that have dry membranous outer scales which perform the function of protection.Non –tunicate bulbs which lack tunic and have loose scales. In tomato, reproduction occurs sexually and in potato vegetative reproduction occurs by tubers. Rye reproduces asexually by the tiller and sexually by spikelets.