Latest questions in this category.
Parthenocarpy is the formation of seedless fruits without fertilization. Auxins and gibberellins, not abscisic acid, can induce parthenocarpy.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Auxins and Gibberellins
Auxins, such as IAA and IBA, are used in tissue culture to promote root formation.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Auxins and Gibberellins
Ethylene promotes rapid internode elongation in deepwater rice plants, enabling them to grow above the water level.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Auxins and Gibberellins
Gibberellins promote bolting, which is the rapid elongation of the internodes just before flowering, particularly in rosette plants like cabbage and beet.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Auxins and Gibberellins
Environmental heterophylly occurs when the shape of leaves changes in response to environmental conditions, such as in buttercup plants.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Auxins and Gibberellins
Auxin is commonly used to induce parthenocarpy, which results in seedless fruit development.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Auxins and Gibberellins
Parthenocarpy is the development of seedless fruits without fertilization. Auxins and gibberellins can induce parthenocarpy, not only cytokinins.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Auxins and Gibberellins
Auxin promotes apical dominance; it does not inhibit it. Cytokinins help overcome apical dominance.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Auxins and Gibberellins
Abscisic acid induces seed dormancy and inhibits germination. Ethylene promotes fruit ripening, and auxin suppresses lateral bud growth (apical dominance).
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Auxins and Gibberellins
2,4-D (2,4-dichlorophenoxyacetic acid) is a synthetic auxin, not a natural one. IAA (indole-3-acetic acid) is a natural auxin.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Auxins and Gibberellins
E. Kurosawa discovered that gibberellins from the fungus *Gibberella fujikuroi* caused abnormal elongation in rice seedlings.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Auxins and Gibberellins
Auxin produced at the apical bud suppresses the growth of lateral buds, resulting in apical dominance.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Auxins and Gibberellins
