Prepare for NEET Biology Plant Growth and Development (Growth Regulators) with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert help to examine auxins, gibberellins, cytokinins, ethylene, and ABA roles.
NEET Questions / Botany / Plant Growth and Development / Growth Regulators
Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin:
does not affect monocots
stimulates growth of monocots
inhibits growth of monocots
is not absorbed by monocots
Which of the following best explains why auxin can be used to create weed-free lawns without harming the grass?
Grasses absorb auxin more slowly than weeds
Auxin promotes grass growth while inhibiting weed growth
Differential sensitivity to auxin in monocots and dicots
Grasses metabolize auxin more efficiently than weeds
A gardener uses a synthetic auxin to control broadleaf weeds in his lawn. The grass, a monocot, remains unaffected. This is primarily due to:
Enhanced auxin metabolism in monocots
Lower auxin sensitivity in monocots
Reduced auxin uptake in monocots
Increased auxin tolerance in monocots
Assertion: Auxin can be used as a herbicide.
Reason: Monocots are generally less sensitive to auxin than dicots.
Both A and R are true and R is the correct explanation of A
Both A and R are true but R is NOT the correct explanation of A
A is true but R is false
A is false but R is true
If a farmer wants to selectively eliminate dicot weeds from a field of monocot crops, which plant growth regulator would be most suitable?
Gibberellin
Cytokinin
Auxin
Abscisic acid
The hormone i.e. used to increase sugarcane yield is
Acidic in nature
Synthesised from indole compounds
Gaseous in nature
Adenine derivatives
The plant hormone which counteracts apical dominance is
Auxin
Cytokinin
Ethylene
ABA
Which of the following hormones is also known as stress hormone?
Cytokinin
ABA
Auxin
Ethylene
