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  4. Plant Growth and Development Chapter-Wise Test 3

Plant Growth and Development Chapter-Wise Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Select the correct statement regarding the phases of plant growth:

The meristematic phase has fully matured cells.
The elongation phase increases cell size.
The maturation phase occurs before the elongation phase.
The log phase represents slow growth.
2

During the elongation phase, cells increase in size due to water absorption and cell wall loosening. The maturation phase occurs after elongation.

Which plant hormone induces apical hook formation in dicot seedlings?

Auxin
Gibberellin
Cytokinin
Ethylene
4

Ethylene induces apical hook formation in dicot seedlings to protect the shoot tip during germination.

Select the correct statement regarding abscisic acid (ABA):

ABA promotes seed germination.
ABA induces stomatal closure during drought.
ABA delays seed dormancy.
ABA promotes cell division.
2

Abscisic acid (ABA) is a stress hormone that induces stomatal closure to reduce water loss during drought. It promotes dormancy, not germination.

Which plant growth regulator delays senescence and is commonly used in plant tissue culture to promote shoot growth?

Gibberellin
Auxin
Cytokinin
Abscisic acid
3

Cytokinins delay senescence (aging) and promote cell division, making them essential for shoot formation in tissue culture.

What is the term for leaves of different shapes found in the same plant due to environmental factors?

Genetic plasticity
Developmental plasticity
Environmental heterophylly
Habitual heterophylly
3

Environmental heterophylly occurs when the shape of leaves changes in response to environmental conditions, such as in buttercup plants.

Which plant growth regulator is known to promote bolting in rosette plants?

Auxin
Gibberellin
Cytokinin
Ethylene
2

Gibberellins promote bolting, which is the rapid elongation of the internodes just before flowering, particularly in rosette plants like cabbage and beet.

Which of the following about seed germination is incorrect?

Gibberellins promote enzyme production for germination.
Abscisic acid promotes seed germination.
Oxygen is required for seed germination.
Water uptake is essential for germination.
2

Abscisic acid (ABA) inhibits seed germination by inducing dormancy. Gibberellins promote germination by breaking down starch into sugars.

Which phase of the sigmoid growth curve represents rapid cell division and elongation?

Lag phase
Log phase
Stationary phase
Decline phase
2

The log phase represents exponential growth, characterized by rapid cell division and elongation.

Select the correct statement about plant hormones:

Cytokinins inhibit cell division.
Abscisic acid promotes seed dormancy.
Gibberellins suppress bolting in rosette plants.
Ethylene delays fruit ripening.
2

Abscisic acid induces seed dormancy, helping seeds survive unfavorable conditions. Cytokinins promote, not inhibit, cell division, and ethylene promotes, not delays, fruit ripening.

Which growth pattern in plants results in a linear curve when plotted against time?

Geometric growth
Arithmetic growth
Sigmoid growth
Exponential growth
2

Arithmetic growth results in a linear curve, as one daughter cell divides while the other differentiates.

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