MERIT YARD

[Plant Growth and Development - VVI MCQs - MERIT YARD]

Question 1 / 40Which plant hormone is responsible for 'Apical Dominance'?

A) Gibberellin

B) Auxin

C) Cytokinin

D) ABA

Question 2 / 40The hormone used to speed up the malting process in brewing industry is:

A) Auxin

B) Gibberellic acid (GA3)

C) Ethylene

D) Cytokinin

Question 3 / 40Which of the following is a gaseous plant hormone?

A) ABA

B) Auxin

C) Ethylene

D) Gibberellin

Question 4 / 40Hormone known as the 'Stress Hormone' in plants is:

A) Ethylene

B) Abscisic acid (ABA)

C) Cytokinin

D) Auxin

Question 5 / 40Coconut milk contains which growth regulator?

A) Cytokinin

B) Auxin

C) Gibberellin

D) ABA

Question 6 / 40Sigmoid growth curve is characteristic of:

A) All living organisms

B) Only plants

C) Only animals

D) Non-living things

Question 7 / 40The response of plants to the duration of light/dark periods is called:

A) Vernalisation

B) Photoperiodism

C) Phototropism

D) Senescence

Question 8 / 40Which process prevents precocious reproductive development late in the growing season?

A) Photoperiodism

B) Vernalisation

C) Abscission

D) Dormancy

Question 9 / 40'Bakanae' (foolish seedling) disease of rice is associated with:

A) Auxin

B) Gibberellin

C) Cytokinin

D) Ethylene

Question 10 / 40Natural auxin found in plants is:

A) IAA (Indole-3-acetic acid)

B) NAA

C) 2,4-D

D) Zeatin

Question 11 / 40Fruit ripening is promoted by:

A) Auxin

B) Cytokinin

C) Ethylene

D) Gibberellin

Question 12 / 40The site of perception of light/dark duration in plants is:

A) Stem apex

B) Leaves

C) Roots

D) Flower buds

Question 13 / 40Which growth regulator acts as an antagonist to GA (Gibberellin)?

A) ABA

B) Ethylene

C) Auxin

D) Zeatin

Question 14 / 40Increase in length of sugarcane stem is due to:

A) Auxin

B) Gibberellin

C) Cytokinin

D) ABA

Question 15 / 40Bolting (internode elongation) can be induced by:

A) Gibberellin

B) Auxin

C) Ethylene

D) ABA

Question 16 / 40Opening and closing of stomata is regulated by:

A) Auxin

B) Cytokinin

C) ABA

D) Ethylene

Question 17 / 40Cytokinin was first isolated from herring sperm DNA as:

A) Zeatin

B) Kinetin

C) IAA

D) GA3

Question 18 / 40Avena curvature test is used for the bioassay of:

A) Gibberellin

B) Auxin

C) Ethylene

D) Cytokinin

Question 19 / 40Which hormone promotes senescence (aging) and abscission?

A) Cytokinin

B) ABA and Ethylene

C) Auxin

D) Gibberellin

Question 20 / 40Ethephon is a source of:

A) Auxin

B) Ethylene

C) ABA

D) Cytokinin

Question 21 / 40Synthesis of Auxin occurs primarily in:

A) Shoot and Root tips

B) Mature leaves

C) Xylem

D) Pith

Question 22 / 40The phase of growth jisme cells attain their maximal size:

A) Meristematic phase

B) Elongation phase

C) Maturation phase

D) Lag phase

Question 23 / 40Growth can be measured by:

A) Fresh weight

B) Dry weight

C) Surface area

D) All of these

Question 24 / 40Arithmetic growth is expressed as:

A) Lt = L0 + rt

B) W1 = W0 ert

C) L0 = Lt + rt

D) W0 = W1 ert

Question 25 / 40Geometric growth curve consists of:

A) Lag phase only

B) Log phase only

C) Lag, Log and Stationary phase

D) Linear curve

Question 26 / 40Which growth regulator prevents leaf fall (abscission) of young leaves?

A) Auxin

B) ABA

C) Ethylene

D) All of these

Question 27 / 40The most common cytokinin found in nature is:

A) Kinetin

B) Zeatin

C) Benzyl adenine

D) ABA

Question 28 / 40Auxin was first discovered by:

A) F.W. Went

B) Charles Darwin

C) Kurosawa

D) Miller

Question 29 / 40Which of the following is used as a weedicide?

A) IAA

B) IBA

C) 2,4-D

D) GA3

Question 30 / 40Flowering in Pineapple is induced by:

A) Auxin and Ethylene

B) Gibberellin

C) Cytokinin

D) ABA

Question 31 / 40Which hormone is known for overcoming apical dominance?

A) Auxin

B) Cytokinin

C) Gibberellin

D) Ethylene

Question 32 / 40Respiration climacteric is associated with:

A) Auxin

B) Ethylene

C) Cytokinin

D) ABA

Question 33 / 40Which hormone promotes internode elongation in dwarf plants?

A) Auxin

B) Gibberellin

C) Cytokinin

D) Ethylene

Question 34 / 40Heterophylly in Buttercup is due to:

A) Environmental plasticity

B) Developmental plasticity

C) Genetic mutation

D) Growth inhibitors

Question 35 / 40Seed dormancy is mainly caused by:

A) Auxin

B) ABA

C) Ethylene

D) Gibberellin

Question 36 / 40Low temperature treatment to induce flowering is:

A) Vernalisation

B) Photoperiodism

C) Bolting

D) Abscission

Question 37 / 40Thinning of cotton, cherry and walnut is done by:

A) Ethylene

B) Auxin

C) Cytokinin

D) GA3

Question 38 / 40Which plants require exposure to light for a period exceeding a well-defined critical duration?

A) Long Day Plants (LDP)

B) Short Day Plants (SDP)

C) Day Neutral Plants (DNP)

D) None

Question 39 / 40Decapitation (removal of shoot tips) is used in tea plantations to:

A) Promote lateral buds

B) Stop growth

C) Reduce water loss

D) Increase root length

Question 40 / 40Which of the following is not a growth promoter?

A) Auxin

B) Gibberellin

C) Cytokinin

D) ABA