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  4. Plant Growth and Development Chapter-Wise Test 2

Plant Growth and Development Chapter-Wise Test 2

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which type of growth pattern results when both daughter cells produced by mitosis retain the ability to divide?

Arithmetic growth
Geometric growth
Sigmoid growth
Linear growth
2

In geometric growth, both daughter cells retain the ability to divide, leading to exponential growth.

What is the role of lateral meristem in plant growth?

Increase in leaf size
Increase in stem length
Increase in stem girth
Development of flowers
3

Lateral meristems, such as vascular cambium and cork cambium, contribute to secondary growth, increasing girth.

Which phase of plant growth involves rapid cell division and large nuclei?

Maturation phase
Elongation phase
Meristematic phase
Stationary phase
3

The meristematic phase is characterized by active cell division, large nuclei, and thin primary cell walls.

Which of the following is an example of environmental heterophylly?

Different leaf types in coriander
Cotton leaves of different shapes
Buttercup leaves in air and water
Larkspur leaf variations
3

Buttercup exhibits environmental heterophylly, where leaves have different forms when produced in air or water.

Which type of growth pattern results in an S-shaped (sigmoid) curve?

Arithmetic growth
Geometric growth
Linear growth
Logarithmic growth
2

Geometric growth, which includes lag, log, and stationary phases, produces an S-shaped (sigmoid) curve.

Which of the following statements about cytokinin is incorrect?

Cytokinin promotes cell division.
Cytokinin delays senescence.
Cytokinin promotes root growth more than shoot growth.
Cytokinin works antagonistically with auxin.
3

Cytokinins primarily promote shoot growth, not root growth. They delay senescence and promote cell division.

What is the ability of a plant to develop different structures from the same meristem called?

Totipotency
Plasticity
Dedifferentiation
Redifferentiation
2

Plasticity is the ability of a plant to produce different structures from the same meristem depending on environmental or developmental conditions.

Select the correct statement about plant growth:

Growth in plants is reversible.
Growth results from cell division and cell enlargement.
Primary growth increases the thickness of plants.
Secondary growth is observed in monocots.
2

Plant growth is irreversible and results from cell division and enlargement. Primary growth increases length, while secondary growth increases thickness and is common in dicots, not monocots.

Which of the following statements about ethylene is incorrect?

Ethylene promotes fruit ripening.
Ethylene accelerates leaf abscission.
Ethylene delays seed germination.
Ethylene inhibits flower senescence.
4

Ethylene promotes, not inhibits, flower senescence. It is also known for fruit ripening and promoting abscission.

Which of the following statements about cytokinins is correct?

Cytokinins promote root growth over shoot growth.
Cytokinins are primarily produced in root tips.
Cytokinins promote leaf senescence.
Cytokinins inhibit cell division.
2

Cytokinins are produced in root tips and promote cell division and shoot growth. They delay, not promote, leaf senescence.

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