Question

Flowering in Pineapple is promoted by
A. GA
B. IAA
C. Ethylene
D. Both B and C

Answer 1

Hint: Flowering is dependent upon the phytohormones.

Complete answer:
Phytohormones are the chemical messengers produced within the plants that coordinate cellular activities.
In the flowering of Pineapple, the activity can be artificially induced by the help of phytohormones like ethylene and IAA (indole acetic acid).
Other hormones that are also involved in the initiation of flowering in pineapple are NAA (naphthalene acetic acid), indole butyric acid (IBA), etc.

Additional information
- These phytohormones play an important role in all aspects of growth and development.
- Ethylene is a gaseous plant hormone that is responsible for the initiation of reproductive development in pineapple.
- Ethylene is named as an aging hormone due to its role in accelerating developmental processes like ripening, senescence, and abscission.
- IAA is the most common natural auxin whose main role in regulating plant growth and development is through cell division and elongation.
- Auxin in the flower promotes maturation of the ovary wall and promotes the full development of the fruit.
- NAA is a synthetic auxin which helps in the flowering of pineapple.
- NAA is a rooting agent used for the vegetative propagation of plants from stem and leaf cuttings.
- IBA is another auxin which helps in inducing root growth in the plant cutting from the parent plant.

So, the correct answer is Both B and C.

Note: Phytohormones are the plant hormones in a very lower concentration. They are of various types performing various functions – auxin, cytokinin, gibberellic acid, brassinosteroids, ethylene, abscisic acid, salicylic acid, and jasmonic acid.