NEET · Biology · Plant Growth & Development doubts
10 doubts found
Why does pinching off the top shoot of a plant make it grow bushier?
The growing tip produces auxin, which travels down and suppresses the side (lateral) buds — this is apical dominance.
Why does keeping a ripe banana or apple with unripe fruit help the unripe ones ripen faster?
Ripening fruit releases ethylene, a gaseous plant hormone that triggers ripening — softening, sweetening and colour change.
Why does a potted plant on a windowsill bend and grow toward the light?
Light causes auxin to move to the shaded side of the shoot tip.
How do growers make seedless grapes bigger, or a rooting powder help cuttings grow roots?
Two hormones are used.
What does “Plant hormones” actually mean in Plant Growth & Development, and why does it matter for NEET?
auxins, gibberellins, cytokinins, ethylene and abscisic acid coordinate growth, each with characteristic effects.
I keep getting “Plant hormones” questions wrong in Plant Growth & Development. What's the trap?
thinking one hormone controls everything.
What does “Apical dominance” actually mean in Plant Growth & Development, and why does it matter for NEET?
auxin from the growing tip suppresses the growth of lateral (side) buds below it.
I keep getting “Apical dominance” questions wrong in Plant Growth & Development. What's the trap?
thinking side branches grow best when the tip is intact.
What is the difference between auxin and ethylene?
Auxin promotes cell elongation, rooting and apical dominance; ethylene is a gas that ripens fruit and triggers ageing and leaf/fruit fall (abscission).
What is the difference between gibberellin and abscisic acid?
Gibberellin promotes stem elongation, seed germination and bolting; abscisic acid (the 'stress hormone') does the opposite — it enforces dormancy and closes stomata under drought.