Plant Growth and Development · Question 7

Which one of the following phytohormones promotes nutrient mobilization which helps in the delay of leaf senescence in plants?

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

Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin

1. promotes apical dominance.
2. promotes abscission of mature leaves only.
3. does not affect mature monocotyledonous plants.
4. can help in cell division in grasses, to produce growth.

Formation of interfascicular cambium from fully developed parenchyma cells is an example for

1. Differentiation
2. Redifferentiation
3. Dedifferentiation
4. Maturation

Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield?

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

Match List-I with List-II :

1. A-II, B-III, C-IV, D-I
2. A-III, B-II, C-I, D-IV
3. A-II, B-I, C-IV, D-III
4. A-II, B-I, C-III, D-IV

F. Skoog observed that callus proliferated from the internodal segments of tobacco stem when auxin was supplied with one of the following except :

1. Extract of Vascular tissues
2. Coconut milk
3. Abscisic acid
4. Yeast Extract

Given below are some statements about plant growth regulators. Choose the correct set of statements from the options given below :

1. A, C, D
2. B, E
3. A, B, C
4. B, D, E

Spraying of which of the following phytohormone on juvenile conifers helps hastening the maturity period, that leads early seed production?

1. Gibberellic Acid
2. Zeatin
3. Abscisic Acid
4. Indole-3-butyric Acid

Which hormone promotes internode/petiole elongation in deep water rice?

1. Kinetin
2. Ethylene
3. 2,4-D
4. GA3

In tissue culture experiments, leaf mesophyll cells are put in a culture medium to form callus. This phenomenon may be called as

1. Dedifferentiation
2. Development
3. Senescence
4. Differentiation