Topic-06. Growth Regulators

51.———————– refers to natural or synthetic substances influence the growth and development.

1. Growth
2. Development
3. Plant Growth regulators (PGR)
4. All of these

52.natural hormones are produced by some tissues in the plant they are also called —————–

1. Exogenous hormones
2. endogenous hormones
3. Both of these
4. None of these

53.———————are produced artificially and similar to natural hormone in physiological activity

1. Natural hormones
2. Hormones
3. Endogenous hormones
4. Synthetic hormones

54.Growth promoting hormones/Growth promoter: they increase the growth of plant. eg

1. Auxins
2. Gibberellins
3. Cytokinins
4. All of these

55.Growth inhibiting hormones/Growth retardant: they ———- the growth of plant

1. inhibit
2. Increase
3. Both
4. None of these

56.”auxein” means- “—————-“.

1. Inhibit
2. Increase
3. to grow/increase
4. All

57.———— are synthesized in the stem and root apices and transported through the plant axis

1. Auxins
2. Gibberellin
3. Cytokinin
4. All of these

58.in plant tissue culture are used to induce callus from explants , and cause root and shoot morphogenesis and parthenocarpy

1. Auxins
2. Gibberellin
3. Cytokinin
4. All of these

59. They have a regulatory function and are produced in the shoot apex primarily in the leaf primordial (leaf bud) and root system.

1. Auxins
2. Gibberellin
3. Cytokinin
4. All of these

60.Roles of ———— are : Promotion of cell division also found in all tissues with
considerable cell division.

1. Auxins
2. Gibberellin
3. Cyotinins
4. All of these