Question

Roses and bananas are usually grown through
A. Parthenocarpy
B. Cuttings
C. Grafting
D. Layering

Answer 1

Hint: Sexual and asexual reproduction are seen in plants. The vegetative reproduction is a means of rapid propagation, as sex cells are not involved, the progeny is identical to parent plant and the process is a type of asexual reproduction.

Complete answer:
Natural and artificial methods can be utilized for vegetative reproduction(cutting, layering, grafting or use of stocks). Cutting is one of the important artificial methods of vegetative propagation.

During the process of cutting, a cut portion of a plant generates a whole new plant as in Rose, Bougainvillea, Banana etc. Banana is one of the largest perennial herbs propagated vegetatively rather than sexually because nearly all cultivated varieties are seedless. Fruits of banana are produced by parthenocarpy.

The principal method of banana propagation is division of suckers or pups which arise from the base of the main stem or from the underground corm. Large suckers are the preferred planting material. These are removed from vigorous clumps of banana trees with a spade when at least three feet tall, during warm months.

Let's look at the options for the correct answer.
Option A: Roses and bananas are not grown through parthenocarpy. Parthenocarpy is the development of fruits without fertilization. Varieties of pineapple, banana fruits are produced by parthenocarpy. Therefore, this is the incorrect option.
Option B: Roses and bananas are grown through cutting. Therefore, this is the correct option.
Option C: Plants such as apple, ash, birches etc are produced by grafting. Roses and bananas are not produced by grafting. Therefore, this is the incorrect option.
Option D: Plants propagated through simple layering include rhododendron, honeysuckle, boxwood etc. Rose and banana are not propagated through layering. Therefore, this is the incorrect option.

Hence the correct answer is option B) Cuttings.

Note: Some of the other plants that can be grown by these methods are,
(i) Parthenocarpy - Pear, Watermelon
(ii) Cuttings - Lilac, rose, Blackberry
(iii) Grafting - Citrus plants
(iv) Layering - Climbing roses, boxwood, was myrtle