Question

Expand the terms: NAA, IAA, SDP, DNP, GA, 2.4-Dichlorophenoxyacetic acid, ABA.

Answer 1

Hint: NAA is an organic compound. IAA, GA and ABA are natural growth regulators present in plants. SDP and DNP refer to certain lengths of the day a plant requires for its development. Whereas, 2.4-Dichlorophenoxyacetic acid are chemical compounds commonly used in agriculture.

Complete step by step answer:
1. NAA: - NAA also known as Naphthalene acetic acid is a kind of organic solvent and a colourless compound. The NAA is a synthetic hormone present in the auxin family that is used in the process of vegetative propagation in plants.
2. IAA: - IAA is a type of natural auxin present in plants. It is a plant growth hormone that helps in regulating growth and development processes such as cell division and elongation. It inhibits the growth of lateral buds in plants. The carboxymethyl substituent that is derived from the indole found in the IAA helps to study plant physiology.
3. SDP: -These are plants that require shorter-day length to flower. It requires about 8-10 hours of light and 14-16 hours of darkness to the flowers. E.g. Chrysanthemum, tobacco and soybean.
4. DNP: - Plants that flower irrespective of the length of the period of light are called day-neutral plants. E.g. pea plants, rose and tomatoes.
5. GA: - Also known as gibberellic acid, is a plant growth regulator that helps in the process of cell division in plants. It acts on the stems and leaves of plants. Because of the presence of the Gibberellic acid as plant hormones, it naturally helps to maintain the growth and other regulatory functions.
6. 2.4-Dichlorophenoxyacetic acid: - In the year 1940, 2, 4-Dichlorophenoxyacetic acid pesticides have been used as a herbicide to control the growth of weeds. It is mostly used in forestry and aquatic sites.
7. ABA:- It is also known as abscisic acid. It is a plant hormone that controls stomatal closure. It also helps to increase the size of the organ and bud dormancy in plants. It is a vital hormone that is involved in the development of plants.

Note: Gibberellic acid is a metabolic byproduct of the fungus Gibberella fujikuroi. In some plants, it inhibits the formation of roots in cuttings. NAA is toxic to animals if it is used in a higher amount. Plant gene regulation, bacterial physiology, fungal symbiosis, and skatole biosynthesis are sometimes affected with the IAA.