Question

Antigibberellin is
A. Cycocel
B. Plastoquinone
C. IAA
D. Ubiquinone

Answer 1

Gibberellins (GAs) are plant hormones that regulate the different type of developmental processes that includes stem elongation, germination, dormancy, flowering, flower development, leaf, and fruit senescence.

Complete answer:
Cycocel is a chemical that acts as an anti-gibberellin. It results in the growth of thick and short stems. It is also called a dwarfing agent. It reduces growth in plants, unlike gibberellin.
The growth retardants include-
1. Cycocel
2. B-nine
The plants were sprayed with three concentrations of growth retardants and that concentration is
1. 500
2. 1000
3. 1500 mg L-1 prepared in 0.1% Tween 80.
Plant height was decreased by the cycocel application but the application of B-nine was not that effective in decreasing the plant height. Cycocel and B-nine application decrease the fresh and dry mass of roots, leaves, and stem. The diameter of the flower was slightly decreased by the spray application of both cycocel and B-nine. Reduced leaf area was the characteristic feature of plants of Erysimum marshallii sprayed with cycocel and B-nine.
The present investigation has suggested that the growth retardants decreased the plant height as an also fresh and dry mass of the plants but did not improve the display value of plants in Erysimum marshallii.
So, the correct option is option A-Cycocel.

Note: Gibberellins are a group of plant hormones responsible for growth and development. They are important for initiating seed germination. Low concentrations of gibberellin can be used to increase the speed of germination, and they stimulate cell elongation so plants grow taller.