Grade 11 Biology: Plants Growth Quiz (Set 2)

Question 1

A botanist measures the primary elongation of a young seedling stem over several days. Primary growth in length is primarily driven by specific meristematic tissues located at root and shoot tips.

Which meristematic tissue is directly responsible for increasing the primary length of plant roots and shoots?

Accepted Answer

A) Apical meristem

Answer

B) Lateral meristem

Answer

C) Vascular cambium

Answer

D) Cork cambium

Question 2

In tea gardens and hedge trimming, gardeners frequently decapitate (remove) shoot tips to promote dense branching and bushy foliage.

Removal of shoot tips promotes lateral bud growth by overriding the influence of which plant growth regulator?

Accepted Answer

B) Auxin

Answer

A) Gibberellin

Answer

C) Cytokinin

Answer

D) Abscisic acid

Question 3

A commercial fruit farmer applies a specific plant hormone spray to grape clusters to elongate the stalks, preventing overcrowded fruit bunches.

Which plant hormone is applied to increase stem length and improve the size and shape of grape clusters?

Accepted Answer

C) Gibberellin

Answer

A) Ethylene

Answer

B) Abscisic acid

Answer

D) Auxin

Question 4

Florists frequently spray cut green foliage with a plant hormone to delay leaf yellowing and extend shelf life.

Which plant growth promoter is known for delaying leaf senescence by mobilizing nutrients?

Accepted Answer

D) Cytokinin

Answer

A) Ethylene

Answer

B) Abscisic acid

Answer

C) Indole-3-acetic acid

Question 5

During severe drought conditions, plants rapidly close their stomata to prevent excessive loss of water vapor through transpiration.

Which plant hormone is synthesized in high amounts during water stress to signal stomatal closure?

Accepted Answer

A) Abscisic acid (ABA)

Answer

B) Auxin

Answer

C) Cytokinin

Answer

D) Gibberellic acid

Question 6

Placing unripe bananas in a sealed paper bag along with a ripe apple causes the bananas to ripen much faster.

Which gaseous plant hormone released by the ripe apple triggers accelerated fruit ripening?

Accepted Answer

B) Ethylene

Answer

A) Auxin

Answer

C) Gibberellin

Answer

D) Abscisic acid

Question 7

A horticulturist notices that certain plant species require an uninterrupted dark period exceeding a critical length in order to initiate flowering.

Plants that flower only when light exposure is less than a critical threshold duration are categorized as:

Accepted Answer

C) Short-day plants

Answer

A) Long-day plants

Answer

B) Day-neutral plants

Answer

D) Quantitative long-day plants

Question 8

A graph plotting plant cell population or organ size against time under natural resource limitations yields a typical S-shaped curve.

What is the standard term used to describe this characteristic S-shaped growth curve?

Accepted Answer

D) Sigmoid curve

Answer

A) Linear curve

Answer

B) Hyperbolic curve

Answer

C) Parabolic curve

Question 9

In an arithmetic growth model, only one daughter cell continues to divide while the other differentiates and matures.

Which mathematical expression correctly represents simple arithmetic growth in plant length over time ($t$)?

Accepted Answer

A) $L_t = L_0 + rt$

Answer

B) $W_1 = W_0 e^{rt}$

Answer

C) $L_t = L_0 	imes rt$

Answer

D) $W_t = W_0 + e^{rt}$

Question 10

Differentiated parenchyma cells in a mature stem regain the capacity to divide and form interfascular cambium during secondary growth.

What is the process called when living mature cells lose their specialization and regain the ability to divide?

Accepted Answer

B) Dedifferentiation

Answer

A) Differentiation

Answer

C) Redifferentiation

Answer

D) Senescence

Question 11

Cells produced by the interfascicular cambium lose their division capability again to form specialized secondary xylem and secondary phloem.

What term describes dedifferentiated cells losing division capacity to take up specific permanent functions?

Accepted Answer

C) Redifferentiation

Answer

A) Primary growth

Answer

B) Dedifferentiation

Answer

D) Abscission

Question 12

Winter varieties of wheat sown in spring fail to flower within the growing season unless exposed to a period of low temperature.

What is the phenomenon of quantitative or qualitative dependence of flowering on low temperature exposure called?

Accepted Answer

D) Vernalization

Answer

A) Photoperiodism

Answer

B) Etiolation

Answer

C) Dormancy

Question 13

A potted plant is placed horizontally on a surface. After a few days, the stem turns and grows upward away from gravity.

What type of growth movement does the upward curvature of the shoot represent?

Accepted Answer

A) Negative geotropism

Answer

B) Positive geotropism

Answer

C) Positive hydrotropism

Answer

D) Thigmotropism

Question 14

When unilateral light shines on a seedling shoot tip, the stem bends towards the light source.

Why does unilateral light cause the seedling tip to bend toward the light source?

Accepted Answer

B) Auxin accumulates on the shaded side, stimulating faster elongation there

Answer

A) Auxin is destroyed on the shaded side

Answer

C) Auxin accumulates on the illuminated side, inhibiting elongation

Answer

D) Cytokinin migrates exclusively to the illuminated side

Question 15

Roots of terrestrial plants consistently grow downward into the soil towards the direction of Earth's gravitational pull.

What term describes the downward directional growth response of roots to gravity?

Accepted Answer

C) Positive geotropism

Answer

A) Negative geotropism

Answer

B) Phototropism

Answer

D) Chemotropism

Question 16

Cotton and coriander plants produce leaves of different shapes depending on whether the plant is juvenile or mature, or exposed to air versus water.

What capacity of plants to follow different developmental pathways in response to environment or life phase is called?

Accepted Answer

D) Plasticity

Answer

A) Senescence

Answer

B) Vernalization

Answer

C) Photoperiodism

Question 17

Rosette plants such as cabbage and beet undergo rapid internodal elongation just prior to flowering when treated with a certain phytohormone.

What is this physiological process of stem elongation before flowering called, and which hormone induces it?

Accepted Answer

A) Bolting, induced by Gibberellins

Answer

B) Abscission, induced by Auxin

Answer

C) Tillering, induced by Cytokinin

Answer

D) Dormancy, induced by Ethylene

Question 18

During fruit ripening in climacteric fruits like apples and tomatoes, there is a sharp transient rise in cellular respiration rate.

Which plant hormone triggers this characteristic respiratory climacteric burst during fruit ripening?

Accepted Answer

B) Ethylene

Answer

A) Auxin

Answer

C) Gibberellin

Answer

D) Cytokinin

Question 19

Examining a root apex longitudinal section shows distinct zones of cellular activity behind the root cap.

Which zone of root growth is situated directly adjacent (proximal) to the region of meristematic activity?

Accepted Answer

C) Region of elongation

Answer

A) Region of maturation

Answer

B) Root cap zone

Answer

D) Secondary zone

Question 20

Synthetic auxins such as 2,4-D (2,4-dichlorophenoxyacetic acid) are widely sprayed by farmers in agricultural fields.

What is the main agricultural application of 2,4-D in crop management?

Accepted Answer

D) Acting as a selective weedicide for broad-leaved dicot weeds

Answer

A) Inhibiting root initiation

Answer

B) Accelerating leaf senescence

Answer

C) Inducing seed dormancy

Grade 11 : Biology - Plants Growth (Set 2)

Grade 11 : Biology - Plants Growth (Set 2)

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Grade 11 : Biology - Plants Growth (Set 2)

Grade 11 : Biology - Plants Growth (Set 2)

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