Plant Hormones
Biology ⇒ Plant Biology
Plant Hormones starts at 9 and continues till grade 12.
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See sample questions for grade 9
Describe how auxins are involved in phototropism.
Describe how cytokinins and auxins interact to control organ formation in plant tissue culture.
Describe one agricultural use of auxins.
Describe the effect of gibberellins on dwarf plants.
A gardener notices that the lower leaves of a plant are yellowing and falling off. Which hormone is most likely involved in this process?
(1) Auxin
(2) Gibberellin
(3) Ethylene
(4) Cytokinin
A farmer wants to produce seedless fruits in a crop. Which plant hormone should be applied to achieve this, and what is the process called?
(1) Gibberellin
(2) Auxin
(3) Cytokinin
(4) Abscisic acid
A plant is exposed to drought conditions. Which hormone is likely to increase in concentration, and what effect does this have on the plant's stomata?
A scientist applies a high concentration of auxin to one side of a horizontally placed stem. Predict and explain the direction in which the stem will bend.
A gardener notices that the lower leaves of a plant are yellowing and falling off. Which hormone is most likely involved in this process?
(1) Auxin
(2) Gibberellin
(3) Ethylene
(4) Cytokinin
Which hormone is commonly used to promote root formation in plant cuttings?
(1) Auxin
(2) Cytokinin
(3) Ethylene
(4) Abscisic acid
Which hormone is mainly responsible for closing stomata during water stress?
(1) Gibberellin
(2) Abscisic acid
(3) Cytokinin
(4) Ethylene
Which hormone is often used to induce flowering in some plants?
(1) Gibberellin
(2) Cytokinin
(3) Abscisic acid
(4) Ethylene
Fill in the blank: __________ are plant hormones that promote cell division and are found in high concentrations in areas of active growth such as shoot tips.
Fill in the blank: __________ are plant hormones that stimulate cell division and are often used in tissue culture to promote shoot formation.
Fill in the blank: __________ is a plant hormone that can inhibit the growth of lateral buds, a phenomenon known as apical dominance.
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 act independently and do not influence each other.
True or False: Cytokinins are only found in the roots of plants.
True or False: Ethylene is a plant hormone that promotes fruit ripening.
