Plant Growth and Development
Test 2

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which type of heterophylly is observed in coriander?

Genetic
Developmental
Environmental
None of the above
2

Developmental heterophylly is observed in coriander, where leaves of juvenile and mature plants differ.

Which plant hormone is responsible for apical dominance?

Cytokinin
Auxin
Gibberellin
Ethylene
2

Auxin inhibits the growth of lateral buds, maintaining apical dominance.

What is dedifferentiation in plants?

Formation of new tissues
Regaining of cell division ability by differentiated cells
Death of cells
Formation of xylem and phloem
2

Dedifferentiation refers to the ability of fully differentiated cells to regain the capacity for cell division.

Which type of growth occurs due to the activity of intercalary meristem?

Primary growth
Secondary growth
Apical growth
Intermittent growth
1

Intercalary meristem contributes to primary growth, particularly in elongation of internodes.

Which of the following statements about gibberellins is incorrect?

Gibberellins promote bolting in rosette plants.
Gibberellins cause parthenocarpy.
Gibberellins delay fruit ripening.
Gibberellins promote seed germination.
3

Gibberellins promote seed germination, bolting, and parthenocarpy but do not delay fruit ripening. Ethylene is responsible for fruit ripening.

Select the correct statement regarding plant growth regulators:

Auxin inhibits root formation.
Cytokinin promotes apical dominance.
Abscisic acid induces dormancy.
Ethylene delays senescence.
3

Abscisic acid induces dormancy. Cytokinin overcomes apical dominance, while auxin promotes rooting. Ethylene accelerates senescence, not delays it.

Which of the following about the sigmoid growth curve is correct?

Lag phase represents rapid growth.
Log phase shows exponential growth.
Stationary phase is the phase of cell division.
Log phase occurs after the stationary phase.
2

The log (exponential) phase shows rapid cell division and growth. The lag phase is slow, and the stationary phase is where growth slows down.

In which phase of the growth curve does rapid cell division occur?

Lag phase
Log phase
Stationary phase
Decline phase
2

During the log (exponential) phase, cells divide rapidly, leading to a steep increase in growth.

Which plant growth regulator induces parthenocarpy in tomatoes?

Auxin
Cytokinin
Gibberellin
Ethylene
1

Auxin promotes parthenocarpy, enabling fruit development without fertilization.

What is the primary role of gibberellins in sugarcane crops?

Promotes flowering
Increases stem length
Induces leaf fall
Enhances root growth
2

Gibberellins increase internode length in sugarcane, boosting sugar yield.

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