Plant Growth and Development Chapter-Wise Test 6

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which plant hormone was discovered by observing the effect of a volatile substance from ripened oranges on bananas?

Auxin
Cytokinin
Ethylene
Gibberellin
3

Ethylene was identified when H.H. Cousins observed that a volatile compound from ripened oranges accelerated the ripening of bananas.

Which plant growth regulator promotes cell division and is naturally found in coconut milk?

Auxin
Cytokinin
Gibberellin
Ethylene
2

Cytokinins, such as zeatin (found in coconut milk), promote cell division and shoot growth in tissue cultures.

Select the incorrect statement regarding phases of growth:

The meristematic phase shows active cell division.
The elongation phase increases cell size.
The maturation phase occurs before the elongation phase.
The log phase represents rapid growth in a sigmoid curve.
3

The maturation phase occurs after the elongation phase, not before.

Which plant growth regulator is used to delay the ripening of fruits during storage?

Abscisic acid
Auxin
Cytokinin
Gibberellin
3

Cytokinins are used to delay senescence and prolong the shelf life of fruits during storage.

What is the term for the capacity of plant cells to regenerate a whole plant?

Differentiation
Dedifferentiation
Totipotency
Redifferentiation
3

Totipotency is the ability of a single cell to regenerate an entire organism, a key principle in plant tissue culture.

Who demonstrated that the tip of the coleoptile is the site of auxin production?

Charles Darwin
E. Kurosawa
F.W. Went
H.H. Cousins
1

Charles Darwin and his son Francis demonstrated that the tip of the coleoptile produces auxin, which causes phototropic bending.

Which plant growth regulator is involved in the formation of parthenocarpic fruits?

Auxin
Cytokinin
Gibberellin
Ethylene
1

Auxins promote the formation of parthenocarpic fruits, such as seedless tomatoes and cucumbers.

Select the correct statement regarding abscisic acid (ABA):

ABA promotes seed germination.
ABA induces stomatal opening.
ABA promotes seed dormancy.
ABA delays leaf senescence.
3

ABA (abscisic acid) induces seed dormancy and promotes stomatal closure during water stress.

Which plant hormone is used to promote root formation in stem cuttings?

Gibberellin
Auxin
Cytokinin
Abscisic acid
2

Auxins, such as IAA and IBA, are used to promote root formation in stem cuttings for plant propagation.

Which plant hormone was first identified from human urine?

Gibberellin
Cytokinin
Auxin
Ethylene
3

Auxin was first isolated from human urine and is known for promoting cell elongation and apical dominance.

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