Plant Growth And Development Chapter-Wise Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which plant hormone causes the rapid elongation of internodes in deepwater rice?

Auxin
Gibberellin
Ethylene
Cytokinin
3

Ethylene promotes rapid internode elongation in deepwater rice plants, enabling them to grow above the water level.

Which statement about differentiation is correct?

Differentiation leads to loss of cell function.
Differentiated cells cannot redifferentiate.
Differentiation produces specialized cells.
Xylem vessels can undergo dedifferentiation.
3

Differentiation results in specialized cells with specific functions. Dedifferentiation allows some cells to regain division capacity, but xylem vessels cannot dedifferentiate.

Which plant growth regulator induces flowering in mango plants?

Gibberellin
Cytokinin
Ethylene
Abscisic acid
3

Ethylene promotes flowering in mango and is widely used to synchronize fruit set.

Which statement about the sigmoid growth curve is correct?

The lag phase represents rapid growth.
The log phase is the phase of exponential growth.
The stationary phase shows maximum growth rate.
The sigmoid curve has no stationary phase.
2

The log (exponential) phase of the sigmoid growth curve represents rapid cell division and maximum growth rate.

Select the correct statement regarding plant plasticity:

Plasticity is the ability to produce different types of fruits.
Heterophylly is an example of plasticity.
Plasticity refers to permanent genetic changes.
Plasticity prevents developmental changes in plants.
2

Heterophylly, the presence of different leaf types in the same plant (e.g., coriander), is an example of developmental plasticity.

Which of the following is an example of developmental plasticity in plants?

Apical dominance
Heterophylly in coriander
Seed dormancy
Phototropism
2

Heterophylly, as seen in coriander, is a form of developmental plasticity where different types of leaves are formed during different stages.

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

Redifferentiation
Dedifferentiation
Differentiation
Apoptosis
2

Dedifferentiation is the process where mature cells regain their ability to divide and form meristematic tissues.

Which plant growth regulator is used to promote root formation in tissue culture?

Cytokinin
Gibberellin
Auxin
Ethylene
3

Auxins, such as IAA and IBA, are used in tissue culture to promote root formation.

Select the correct statement regarding parthenocarpy:

Parthenocarpy results in seedless fruits.
Parthenocarpy requires fertilization.
Abscisic acid induces parthenocarpy.
Parthenocarpy is common in cereals.
1

Parthenocarpy is the formation of seedless fruits without fertilization. Auxins and gibberellins, not abscisic acid, can induce parthenocarpy.

What is the term for the reversion of mature cells to a meristematic state?

Differentiation
Dedifferentiation
Redifferentiation
Senescence
2

Dedifferentiation is the process where mature, specialized cells revert to a meristematic state, regaining the ability to divide.

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