Which one of the following is primarily concerned with cell division ?

GA₃
IAA
Cytokinin
IBA

Solution

Cytokinins induce cell division in plants and thus influence the plant growth by controlling cell division.

Which of the following test will you perform to demonstrate the presence of gibberellin ?

Bolting of cabbage
Differentiation of shoots in tobacco callus culture
Rapid division in carrot cells
Elongation of Avenacoleoptile

Solution

Bolting of cabbage can be induced artificially by the application of gibberellin under conditions that would normally maintain the rossette form.

Choose the wrongly matched pair from the following

Auxins – “to grow”
Gibberellins – “gibberella fujikurai”
Cytokinins – Herring sperm DNA
Abscisic acid – Flowering hormone

Which one of the following nutrients is concerned with the growth of the plants in view of their role in synthesis of auxin ?

Solution

Zinc is essential for the synthesis of tryptophan - a precursor of auxins.

Which of the following events would likely occur if a plant tissue culture is treated with a solution containing a relatively high concentration of cytokinin and a relatively low concentration of auxin ?

Bud and shoot formation; rapid cell expansion;decreased cell division.
Bud and shoot formation; slow cell expansion;increased cell division.
Bud and shoot formation; rapid cell expansion; increased cell division.
Root formation; rapid cell expansion; decreased cell division.

Solution

Cytokinin promotes bud and shoot formation and increased cell division; auxin promotes root formation and increased cell elongation.

Pineapple can be made to flower in off season by:

Ethylene
Zeatin
Napthalene Acetic Acid (NAA)
Temperature

Match the growth regulators in column-I with the processes in column-II and choose the correct combination.Column-I Column-II

Column – I	Column – II
(a)Auxin	(i)Colouring test in lemon
(b)Gibberellin	(ii)Cell division test in plants
(c)Cytokin in	(iii)Avena curvature test
(d)Ethylene	(iv)Dwarf corn test

(a) – (iii), (b) – (iv), (c) – (ii), (d) – (i)
(a) – (i), (b) – (iv), (c) – (ii), (d) – (iii)
(a) – (iv), (b) –(iii), (c) – (i), (d) – (ii)
(a) – (ii), (b) – (i), (c) – (iv), (d) – (iii)

Experiments done by Charles Darwin and his son on plant phototropism showed that

Auxin is produced in the tip of the coleoptile.
The tip of the coleoptile is the light receptor of the plant.
Within coleoptiles, auxin moves laterally away from the source of the light.
More cell elongation takes place on the shaded side of the plant

Which one of the following is a naturally occurring growth inhibitor ?

Which of the following is not an effect of gibberellins on plant development in at least some species ?

Stem elongation
Fruit development
Induction of bolting
Phototropism

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