Plant Growth and Development
Test 4

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which plant hormone is involved in the formation of adventitious roots from stem cuttings?

Gibberellin
Cytokinin
Auxin
Abscisic acid
3

Auxins, such as IAA and IBA, promote the formation of adventitious roots in stem cuttings.

Which plant growth regulator is responsible for bolting in rosette plants like cabbage?

Ethylene
Gibberellin
Auxin
Abscisic acid
2

Gibberellins promote bolting (rapid internode elongation) in rosette plants like cabbage and beet.

Which process involves the loss of cell division capacity in mature cells?

Differentiation
Dedifferentiation
Redifferentiation
Senescence
1

Differentiation is the process by which cells lose their ability to divide and become specialized.

Which plant growth regulator is responsible for delaying senescence and promoting nutrient mobilization?

Gibberellin
Cytokinin
Auxin
Abscisic acid
2

Cytokinins delay leaf senescence (anti-aging hormone) and promote nutrient mobilization.

Select the correct statement regarding plant plasticity:

Plasticity is the ability to perform photosynthesis.
Cotton shows environmental plasticity.
Plasticity results in the same leaf forms.
Heterophylly is a form of plasticity.
4

Heterophylly, the occurrence of different leaf forms in the same plant (e.g., coriander), is an example of plasticity.

Which of the following statements about plant growth regulators is correct?

Ethylene promotes root elongation.
Auxin inhibits apical dominance.
Cytokinin delays leaf senescence.
Gibberellins inhibit seed germination.
3

Cytokinins delay leaf senescence (anti-aging hormone). Auxin promotes apical dominance, and gibberellins promote, not inhibit, seed germination.

Select the correct statement about seed germination:

Gibberellins promote the production of alpha-amylase.
Abscisic acid breaks seed dormancy.
Ethylene inhibits seed germination.
Auxins promote seed germination directly.
1

Gibberellins stimulate alpha-amylase production, which breaks down starch into sugars during seed germination. Abscisic acid induces, not breaks, dormancy.

What is the process by which living differentiated cells regain the ability to divide?

Differentiation
Dedifferentiation
Redifferentiation
Apoptosis
2

Dedifferentiation is the process where mature cells regain their ability to divide, forming meristematic tissue.

Which plant growth regulator is commonly used in the brewing industry to accelerate malting?

Cytokinin
Gibberellin
Auxin
Ethylene
2

Gibberellin (GA3) is used in the brewing industry to speed up the malting process by promoting enzyme production.

Which phenomenon in plants refers to the ability to produce different types of leaves in different conditions?

Photoperiodism
Plasticity
Vernalization
Abscission
2

Plasticity refers to the ability of plants to show different forms under different environmental or developmental conditions, such as heterophylly.

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