Plant Growth and Development

The gaseous plant growth regulator is used in plants to:

1. speed up the malting process
2. promote root growth and root hair formation to increase the absorption surface
3. help overcome apical dominance
4. kill dicotyledonous weeds in the fields

Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants:

1. ABA
2. Gibberellin
3. Ethylene
4. Cytokinin

The ability of plants to follow different pathways in response to environment leading to formation of different kinds of structures is called

1. Differentiation
2. Redifferentiation
3. Development
4. Plasticity

Which of the following growth regulators is an adenine derivative?

1. Abscisic acid
2. Auxin
3. Cytokinin
4. Ethylene

The phenomenon by which the undividing parenchyma cells start to divide mitotically during plant tissue culture is called as

1. Secondary growth
2. Differentiation
3. Dedifferentiation
4. Redifferentiation

Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called

1. Maturity
2. Elasticity
3. Flexibility
4. Plasticity

The site of perception of light in plants during photoperiodism is

1. Leaf
2. Shoot apex
3. Stem
4. Axillary bud

The plant hormone used to destroy weeds in a field

1. IBA
2. IAA
3. NAA
4. 2, 4-D

Which of the following is not an inhibitory substance governing seed dormancy?

1. Para-ascorbic acid
2. Abscisic acid
3. Gibberellic acid
4. Phenolic acid

Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop

1. Abscisic acid
2. Cytokinin
3. Gibberellin
4. Ethylene