Plant Hormones and Growth Regulators MCQs

Which hormone is primarily responsible for promoting cell elongation in plants?
a) Gibberellins
b) Auxins
c) Cytokinins
d) Ethylene
Answer: b) Auxins
What is the role of gibberellins in plant growth?
a) Inhibit seed germination
b) Promote fruit ripening
c) Stimulate stem elongation
d) Enhance leaf drop
Answer: c) Stimulate stem elongation
Which hormone is known as the “stress hormone” in plants?
a) Auxin
b) Ethylene
c) Abscisic acid
d) Cytokinin
Answer: c) Abscisic acid
What effect does cytokinins have on plant tissues?
a) Promote cell division
b) Inhibit cell elongation
c) Induce flowering
d) Stimulate root growth
Answer: a) Promote cell division
Which hormone is primarily involved in the ripening of fruits?
a) Auxins
b) Ethylene
c) Gibberellins
d) Abscisic acid
Answer: b) Ethylene
Which plant hormone is responsible for apical dominance?
a) Gibberellins
b) Auxins
c) Cytokinins
d) Ethylene
Answer: b) Auxins
What is the primary function of abscisic acid in plants?
a) Stimulate growth
b) Promote seed germination
c) Induce dormancy
d) Enhance photosynthesis
Answer: c) Induce dormancy
Which hormone is involved in promoting the development of lateral roots?
a) Auxin
b) Cytokinin
c) Ethylene
d) Gibberellin
Answer: a) Auxin
What is the main role of brassinosteroids in plants?
a) Promote fruit ripening
b) Enhance cell elongation and division
c) Induce flowering
d) Inhibit root growth
Answer: b) Enhance cell elongation and division
Which plant hormone is known to delay senescence (aging) in leaves?
a) Ethylene
b) Cytokinin
c) Abscisic acid
d) Auxin
Answer: b) Cytokinin
What effect does auxin have on phototropism?
a) It has no effect
b) It causes plants to bend toward light
c) It causes plants to bend away from light
d) It inhibits growth
Answer: b) It causes plants to bend toward light
Which hormone is primarily responsible for the elongation of stems and fruit development?
a) Ethylene
b) Cytokinin
c) Gibberellin
d) Abscisic acid
Answer: c) Gibberellin
In what way does ethylene influence leaf abscission?
a) It promotes leaf retention
b) It stimulates leaf drop
c) It has no effect
d) It induces flowering
Answer: b) It stimulates leaf drop
Which hormone is associated with seed dormancy?
a) Gibberellins
b) Auxins
c) Abscisic acid
d) Cytokinins
Answer: c) Abscisic acid
Which plant hormone is known for its role in stimulating flowering in long-day plants?
a) Auxin
b) Gibberellin
c) Ethylene
d) Abscisic acid
Answer: b) Gibberellin
What is the primary action of auxin in root development?
a) Stimulate root growth
b) Inhibit root growth
c) Promote leaf growth
d) Induce flowering
Answer: a) Stimulate root growth
Which hormone is produced in response to stress, such as drought?
a) Ethylene
b) Abscisic acid
c) Gibberellin
d) Cytokinin
Answer: b) Abscisic acid
Which growth regulator is derived from fungi and is known to promote cell elongation?
a) Ethylene
b) Gibberellin
c) Auxin
d) Cytokinin
Answer: b) Gibberellin
What role does cytokinins play in plant tissue culture?
a) Promote leaf senescence
b) Induce root formation
c) Promote shoot proliferation
d) Stimulate fruit ripening
Answer: c) Promote shoot proliferation
Which plant hormone can cause fruit to develop without fertilization, a process known as parthenocarpy?
a) Auxin
b) Gibberellin
c) Ethylene
d) Abscisic acid
Answer: a) Auxin
What is the effect of gibberellins on seed germination?
a) Inhibit germination
b) Promote germination
c) Have no effect
d) Cause premature germination
Answer: b) Promote germination
Which hormone is involved in the response to gravity in plants?
a) Ethylene
b) Auxin
c) Cytokinin
d) Abscisic acid
Answer: b) Auxin
How does ethylene influence the ripening of fruits?
a) It inhibits ripening
b) It has no effect
c) It promotes ripening
d) It prevents decay
Answer: c) It promotes ripening
Which hormone plays a role in the elongation of internodes in some plants?
a) Cytokinin
b) Ethylene
c) Gibberellin
d) Abscisic acid
Answer: c) Gibberellin
What is the main action of auxins in response to touch (thigmotropism)?
a) They promote growth on the side away from the stimulus
b) They inhibit growth on the side towards the stimulus
c) They have no effect
d) They promote growth uniformly
Answer: a) They promote growth on the side away from the stimulus
Which hormone is involved in regulating water loss during drought stress?
a) Auxin
b) Cytokinin
c) Abscisic acid
d) Ethylene
Answer: c) Abscisic acid
What role does jasmonic acid play in plants?
a) Stimulates growth
b) Involved in defense responses
c) Promotes flowering
d) Enhances photosynthesis
Answer: b) Involved in defense responses
Which hormone is known to promote seed development and maturation?
a) Auxin
b) Gibberellin
c) Ethylene
d) Abscisic acid
Answer: d) Abscisic acid
Which plant hormone can be used to induce flowering in short-day plants?
a) Cytokinin
b) Gibberellin
c) Auxin
d) Ethylene
Answer: b) Gibberellin
What is the primary function of strigolactones in plants?
a) Promote seed germination
b) Regulate shoot branching
c) Stimulate root growth
d) Enhance leaf senescence
Answer: b) Regulate shoot branching

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