Plant Growth and Development Chapter-Wise Test 7

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which growth curve phase is known for a slow initial growth rate before the exponential phase?

Log phase
Lag phase
Stationary phase
Decline phase
2

The lag phase is the initial phase with slow growth, preparing cells for rapid division in the log phase.

During which phase of growth do cells show maximum increase in their size and develop thick cell walls?

Meristematic phase
Elongation phase
Maturation phase
Stationary phase
3

In the maturation phase, cells attain their maximal size with thickened walls and fully developed structures.

Which statement regarding plant growth is incorrect?

Growth is a permanent and irreversible increase in size.
Primary growth increases the thickness of plants.
Secondary growth occurs due to lateral meristems.
Intercalary meristems contribute to elongation in grasses.
2

Primary growth increases the length of plants, not thickness. Secondary growth, caused by lateral meristems, increases thickness.

Which plant growth regulator is known to promote female flowers in cucumbers, increasing yield?

Auxin
Cytokinin
Ethylene
Gibberellin
3

Ethylene promotes the formation of female flowers in cucumbers, thereby increasing yield.

Which phase of growth involves cells attaining their maximal size with thickened cell walls?

Elongation phase
Meristematic phase
Maturation phase
Lag phase
3

In the maturation phase, cells attain their maximal size and develop thickened walls to perform specialized functions.

What is the process by which differentiated cells regain the ability to divide and form new meristematic tissue?

Differentiation
Dedifferentiation
Redifferentiation
Apoptosis
2

Dedifferentiation occurs when mature cells regain the ability to divide and become meristematic.

Which plant hormone is used commercially for fruit ripening?

Gibberellin
Cytokinin
Ethylene
Auxin
3

Ethylene is widely used for the artificial ripening of fruits such as bananas and tomatoes.

Which plant growth regulator is widely used to induce flowering in long-day plants under short-day conditions?

Auxin
Cytokinin
Gibberellin
Ethylene
3

Gibberellins can induce flowering in long-day plants even under short-day conditions by promoting stem elongation and floral initiation.

Which plant growth regulator is responsible for promoting nutrient mobilization, thereby delaying leaf senescence?

Auxin
Cytokinin
Gibberellin
Abscisic acid
2

Cytokinins delay senescence by mobilizing nutrients and promoting protein synthesis.

Which hormone is responsible for the phenomenon of apical dominance?

Gibberellin
Cytokinin
Auxin
Ethylene
3

Auxin produced at the apical bud suppresses the growth of lateral buds, resulting in apical dominance.

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