Plant Growth and Development

Heterophyllous development in response to environment is an example of which of the following phenomena?

1. Redifferentiation
2. Dedifferentiation
3. Elasticity
4. Plasticity

Which of the following plant growth regulators promotes internode elongation prior to flowering in cabbage?

1. Ethephon
2. Abscisic acid
3. Gibberellin
4. Indole butyric acid

Which of the following plant growth regulators is used as herbicide?

1. Gibberellin
2. 2,4-D
3. Kinetin
4. Abscisic acid

Length of the stem at time 0 is 20 cm. The arithmetic growth rate is 30 cm per day. What is the length of the stem at the end of the 7th day?

1. 460 cm
2. 50 cm
3. 170 cm
4. 230 cm

Read the following statements on plant growth and development. Choose the option with all correct statements.

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

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