Plant Growth and Development — Important Questions
ICSE · Class 11 · Biology
60 important questions from Plant Growth and Development for ICSE Class 11 Biology, with answers. Includes multiple choice and true false questions.
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Important Questions from Plant Growth and Development
Which disease in rice led to the discovery of gibberellins?
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Bakanae (foolish seedling) disease
Bakanae (foolish seedling disease) caused by Gibberella fujikuroi led to the discovery of gibberellins. E. Kurosawa (1926) found that infected seedlings showed hyperelongation due to a substance secreted by this fungus.
The most active naturally occurring cytokinin is:
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Zeatin
Zeatin is the most active naturally occurring cytokinin, isolated from the endosperm of corn (Zea mays) by Letham and Miller in 1964. Kinetin is the first cytokinin discovered but is synthetic (from herring sperm DNA).
ABA is also known as:
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Stress hormone
ABA (Abscisic Acid) is called the stress hormone because it mediates plant responses to various stresses — especially water stress (drought), where it promotes stomatal closure to reduce water loss.
Ethylene is the only plant hormone that is:
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A gas at room temperature
Ethylene (C₂H₄) is the only gaseous plant hormone. It is an unsaturated hydrocarbon that can easily diffuse inside the plant through intercellular spaces. Its chemical formula is C₂H₄.
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