Plant Hormones
Biology ⇒ Plant Biology
Plant Hormones starts at 9 and continues till grade 12.
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See sample questions for grade 12
A plant is exposed to light from one side only. Which hormone redistributes to the shaded side, causing the plant to bend towards the light?
Describe how abscisic acid and gibberellins have opposite effects on seed dormancy.
Describe the interaction between auxin and cytokinin in tissue culture for shoot and root formation.
Describe the role of auxin in phototropism.
Describe the role of gibberellins in bolting of rosette plants.
Explain how ethylene affects fruit ripening.
Explain the role of cytokinins in tissue culture and micropropagation.
A plant is exposed to light from one side only. Which hormone redistributes to the shaded side, causing the plant to bend towards the light?
Which of the following hormones is antagonistic to gibberellins in seed germination? (1) Auxin (2) Cytokinin (3) Abscisic acid (4) Ethylene
Which of the following hormones is involved in the regulation of fruit development? (1) Auxin (2) Cytokinin (3) Gibberellin (4) All of the above
Which of the following is a function of abscisic acid? (1) Promotes fruit ripening (2) Induces stomatal closure (3) Stimulates stem elongation (4) Delays leaf senescence
Which of the following is a synthetic auxin used as a herbicide? (1) 2,4-D (2) Zeatin (3) Kinetin (4) ABA
Fill in the blank: __________ are plant hormones that promote cell division, especially in shoots and roots.
Fill in the blank: __________ is the only plant hormone that exists as a gas under normal physiological conditions.
Fill in the blank: The first plant hormone to be discovered was __________.
Fill in the blank: The hormone __________ is known to promote fruit ripening and leaf abscission.
True or False: Abscisic acid promotes seed germination.
True or False: All plant hormones are transported through the phloem.
True or False: Cytokinins are synthesized mainly in the roots and transported to other parts of the plant.
True or False: Cytokinins delay leaf senescence.
