Question 1: Palette 1/45

DPT MCQ

“A plant after decapitation becomes bushy”. The possible reason of above phenomenon is

A

Removal of apical buds promote growth of lateral buds into branches

B

Removal of apical buds induce stem elongation as auxin suppresses production of gibberellins

C

Apical buds release some hormone which kills lateral buds

D

Lateral buds have auxins which are suppressed in presence of cytokinin

Question 2: Palette 2/45

DPT MCQ

Given below are two statements: One is labelled as Assertion (A) and other is labelled as Reason (R).
Assertion (A): Abscisic acid is known as stress hormone.
Reason (R): Synthesis of ABA is stimulated by drought, water logging and other adverse environmental conditions and it increases the tolerance of plants towards it.
In the light of the above statements, choose the correct answer from the options given below:

A

Both Assertion & Reason are true and the reason is the correct explanation of the assertion

B

Both Assertion & Reason are true but the reason is not the correct explanation of the assertion

C

Assertion is true statement but Reason is false

D

Both Assertion and Reason are false statements

Question 3: Palette 3/45

DPT MCQ

Plants follows different pathways in response to environment or phases of life to form different kinds of structures this ability is called :

A

Plasticity

B

Maturity

C

Elasticity

D

Flexibility

Question 4: Palette 4/45

DPT MCQ

Select the incorrectly matched pair.

A

Auxins – stimulates shoot formation on stem cuttings

B

Cytokinin – Delay the senescence of intact leaves

C

Gibberellins – Increase the length of grapes stalks

D

Ethylene – Accelerates shedding of leaves, flowers and fruits

Question 5: Palette 5/45

DPT MCQ

Removal of shoot tips is a very useful technique to boost the production of tea leaves this is because :

A

Gibberellins present bolting and are inactivated

B

Auxins prevent leaf drop at early stages

C

Effect of auxins is removed and growth of lateral buds is enhanced

D

Gibberellins delay senescence of leaves

Question 6: Palette 6/45

DPT MCQ

It takes very long time for pineapple plants to produce flowers which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield :

A

Cytokinin and abscisic acid

B

Auxin and ethylene

C

Gibberellin and cytokinin

D

Gibberellin and abscisic acid

Question 7: Palette 7/45

DPT MCQ

You are given a tissue with its potential for differentiation in an artificial culture which of the following pairs of hormones would you add to the medium to secure shoots as well as roots ?

A

IAA and Gibberellin

B

Auxin and cytokinin

C

Auxin and abscisic acid

D

Gibberellin and abscisic acid

Question 8: Palette 8/45

DPT MCQ

Read the following Assertion (A) and Reason (R)
Assertion (R) : Several hormonal and structural changes are initiated which lead to the differentiation and further development of the floral primordium.
Reason (A) : Shoot apical meristem transforms into floral meristem

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true but (R) is not the correct explanation of (A)

C

Both (A) and (R) are false

D

(A) is true but (R) is false

Question 9: Palette 9/45

DPT MCQ

Select the correct option for the hormone which was first isolated from human urine.

A

Widely applied in tea-plantations for hedge-making

B

Controls xylem differentiation and helps in cell division

C

Acidic and is used to increase the length of grapes stalks

D

Induces seed and bud dormancy

Question 10: Palette 10/45

DPT MCQ

If the apical bud has been removed then we observe :

A

More lateral branches

B

More axillary buds

C

Plant growth stops

D

Flowering stops

Question 11: Palette 11/45

DPT MCQ

Who coined the term kinetin:

A

Skoog and miller

B

Cousin

C

F.W. Went

D

Kurosawa

Question 12: Palette 12/45

DPT MCQ

Match the column-I with column-II |

A

a(i), b(ii), c(iii), d(iv)

B

a(ii), b(iii), c(iv), d(i)

C

a(iii), b(iv), c(ii), d(i)

D

a(ii), b(iv), c(iii), d(i)

Question 13: Palette 13/45

DPT MCQ

Cork, secondary cortex and secondary xylem are formed through

A

Dedifferentiation

B

Redifferentiation

C

Differentiation

D

Obliteration

Question 14: Palette 14/45

DPT MCQ

At day one, the area of leaf A was $10\ cm^2$ and that of leaf B was $100\ cm^2$. On next day, area of leaf B was $110\ cm^2$ and that of leaf A was $20\ cm^2$. The relative growth rate of leaf B and A is

A

20% and 19%

B

100% and 10%

C

10% and 100%

D

11% and 20%

Question 15: Palette 15/45

DPT MCQ

Buttercup and coriander differ from each other in terms of development as in the former

A

The plant follow different pathway in response to phases of life to form different kinds of structures

B

The leaves of the juvenile plants are different in shape from those of mature plants.

C

The sequence of the development process ultimately lead to senescence and then death

D

There is difference in shape of leaves produced in air with those produced in water

Question 16: Palette 16/45

DPT MCQ

Which of the following statements are correct regarding growth?
(A) In plants, form of growth is open and localised
(B) Swelling of piece of wood in water is considered as growth since it involve the increase in size
(C) Growth is accompanied by metabolic processes
(D) Growth, at a cellular level, is a result of increase in the amount of protoplasm

A

All the statements are correct

B

A and B

C

B, C and D

D

A, C and D

Question 17: Palette 17/45

DPT MCQ

Removal of shoot tips is a very useful technique to boost the production of tea leaves. This is because:

A

Gibberellins prevent bolting and are inactivated

B

Auxins prevent leaf drop at early stages

C

Effect of auxins is removed and growth of lateral buds is enhanced.

D

Gibberellins delay senescence of leaves

Question 18: Palette 18/45

DPT MCQ

One of the commonly used plant growth hormone in tea plantations is - :

A

Abscisic acid

B

Zeatin

C

Indole -3- acetic acid

D

Ethylene

Question 19: Palette 19/45

DPT MCQ

The three phases of growth in correct order is-

A

Meristematic, maturation, elongation

B

Elongation, meristematic, maturation

C

Meristematic, elongation, maturation

D

Elongation, maturation, meristematic

Question 20: Palette 20/45

DPT MCQ

Given below are two statements: Statement-I : Plant growth is unique because plants retain the capacity for unlimited growth throughout their life. Statement-II : Growth, at a cellular level, is principally a consequence of increase in the amount of protoplasm. In the light of the above statements, choose the most appropriate answer from option given below

A

Both Statement-I and Statement-II are incorrect.

B

Statement-I is correct but statement-II is incorrect.

C

Statement-I is incorrect but Statement-II is correct.

D

Both Statement-I and Statement-II are correct.

Question 21: Palette 21/45

DPT MCQ

Given below are two statements; one is labelled as Assertion (A) and the other is labelled as Reason(R) .
Assertion (A) : Development is a term that includes all changes that an organism goes through during its life cycle.
Reason (R) : Plants follow different pathways in response to environment or phases of life to form different kinds of structure.
Choose the most appropriate answer from the options given below :

A

Both (A) & (R) are correct but (R) is not the correct explanation of (A).

B

(A) is correct but (R) is not correct.

C

(A) is not correct but (R) is correct.

D

Both (A) & (R) are correct and (R) is the correct explanation of (A).

Question 22: Palette 22/45

DPT MCQ

Match the following

A

A - iii, B - iv, C - i, D - ii

B

A - i, B - ii, C - iii, D - iv

C

A - iv, B - iii, C - ii, D - i

D

A - ii, B - i, C - iv, D – iii

Question 23: Palette 23/45

DPT MCQ

Which of the following phenomenon in plants requires interaction of more than one plant growth regulator :-

A

Dormancy in seeds/buds

B

Apical dominance

C

Senescence

D

All of the above

Question 24: Palette 24/45

DPT MCQ

(i) Promote nutrient mobilisation,
(ii) Overcome the apical dominance,
(iii) Lateral shoot growth.
All the above physiological effects are related to which of the following plant growth regulators?

A

Auxins

B

Gibberellins

C

Abscisic acid

D

Cytokinins

Question 25: Palette 25/45

DPT MCQ

The plant growth regulators (PGRs) are

A

Simple organic substances of different chemical composition

B

Complex organic substances of different chemical composition

C

Simple and complex organic substances of same chemical composition

D

Small organic substances of same chemical composition

Question 26: Palette 26/45

DPT MCQ

Identify the correct set of statements :
(a) Cytokinins helps to promote apical dominance.
(b) Ethylene is synthesised in large amounts by tissues undergoing senescence and ripening fruit.
(c) ABA plays and important role in seed development, maturation and dormancy.
(d) Seed dormancy is when seeds fails to germinate even with external conditions are favourable.

A

a, b and c only

B

b, c and d only

C

a, c and d only

D

a, b and d only

Question 27: Palette 27/45

DPT MCQ

Match the following

A

a(iii), b(ii), c(iv), d(i)

B

a(iv), b(i), c(iii), d(ii)

C

a(iv), b(i), c(ii), d(iii)

D

a(iv), b(ii), c(iii), d(i)

Question 28: Palette 28/45

DPT MCQ

Which of the following was one of the first gibberellins to be discovered and is the most intensively studied form?

A

$GA_1$

B

$GA_2$

C

$GA_3$

D

$GA_4$

Question 29: Palette 29/45

DPT MCQ

Which of the following is a derivative of acetyl CoA and also responsible for delaying the ripening of fruits?

A

Gibberellin

B

Auxin

C

Cytokinin

D

ABA

Question 30: Palette 30/45

DPT MCQ

Given below are two statements:
Statement-I : One single maize root apical meristem can give rise to more than 17,500new cell per day.
Statement-II : Cells in watermelon may increase in size by upto3,50,000 times. Choose the most appropriate answer

A

Both Statement-I and Statement-II are incorrect.

B

Statement-I is correct but statement-II is incorrect.

C

Statement-I is incorrect but Statement-II is correct.

D

Both Statement-I and Statement-II are correct.

Question 31: Palette 31/45

DPT MCQ

“Avena” coleoptile curvature test is used for bioassay of a hormone ‘X’.” ‘X’ can be artificially used to
a. Induce parthenocarpy in tomatoes.
b. Promote shooting in callus.
c. Remove dicot weeds from crop fields.

A

a only

B

b only

C

b and c

D

a and c

Question 32: Palette 32/45

DPT MCQ

During geometric growth of an organism, the initial phase is

A

Lag phase

B

Exponential phase

C

Log phase

D

Stationary phase

Question 33: Palette 33/45

DPT MCQ

Plant growth as compared to animals is unique because

A

It is accompanied by metabolic processes, that occur at the expense of energy

B

They retain the capacity for unlimited growth throughout their life due to presence of meristems

C

Growth in plants is at the tips only

D

There is an irreversible permanent increase in size of an organ or its part or even of an individual cell

Question 34: Palette 34/45

DPT MCQ

Identify the PGRs that naturally occur in plants: (a) Kinetin, (b) IAA, (c) $2, 4-D$, (d) Zeatin, (e) $GA_3$

A

(a), (b) and (d)

B

(b), (d) and (e)

C

(a) and (c)

D

(a), (b), (d) and (e)

Question 35: Palette 35/45

DPT MCQ

Development in plants is controlled by

A

PGR only

B

Environmental, genetic and intercellular factors

C

Intracellular factors only

D

Intrinsic factors only

Question 36: Palette 36/45

DPT MCQ

Abscission promoting growth hormones are

A

Auxin and cytokinin

B

Ethylene and Gibberellin

C

Cytokinin and ABA

D

ABA and ethylene

Question 37: Palette 37/45

DPT MCQ

The cells proximal to meristematic zone have/show: (a) Large conspicuous nuclei, (b) Thin cellulosic cell wall, (c) Increased vacuolation, (d) New cell wall deposition, (e) High rate of cell division

A

(a), (b) and (e) only

B

(b), (c) and (d) only

C

(c) and (d) only

D

(a) and (e) only

Question 38: Palette 38/45

DPT MCQ

Apical dominance can be counteracted by

A

Application of ethylene

B

Application of Cytokinin

C

Removal of lateral buds

D

Providing auxins to plant

Question 39: Palette 39/45

DPT MCQ

Dormancy of seeds is induced by hormone that also

A

Inhibits the protein and RNA synthesis in leaves

B

Induces fruit ripening

C

Activates the $\alpha\text{-amylase}$ in seeds

D

Induces rooting and root hair formation

Question 40: Palette 40/45

DPT MCQ

Identify the correct set of statements :
(a) A sigmoid curve is a characteristic of living organisms growing in a natural environment.
(b) Differentiated cells can regain the capacity to divide is termed as dedifferentiation.
(c) The plant growth regulators are small simple molecules of diverse chemical composition.
(d) Auxin was isolated by F.W. Went from tips of coleoptiles of oat seedlings.

A

a, b and c only

B

b, c and d only

C

a, c and d only

D

a, b, c and d

Question 41: Palette 41/45

DPT MCQ

A phytohormone that helps the plants to increase their absorption surface by promoting root hair formation is

A

Gibberellic acid

B

Ethylene

C

Zeatin

D

Cytokinin

Question 42: Palette 42/45

DPT MCQ

Read the following w.r.t. auxin.
i. It has been extensively used in agricultural practices.
ii. It promotes fruit and leaf drop at early stages of plant.
iii. It was first isolated from tip of coleoptile of oat.
iv. It is composed of indole compound.
The correct ones are

A

i, iii and iv only

B

i and iv only

C

ii and iii only

D

All i, ii, iii and iv

Question 43: Palette 43/45

DPT MCQ

Auxin helps in all, except

A

Apical hook formation

B

Apical dominance

C

Cell division

D

Xylem differentiation

Question 44: Palette 44/45

DPT MCQ

All the given plant tissues are re-differentiated, except.

A

Secondary phloem

B

Secondary xylem

C

Cork

D

Cork cambium

Question 45: Palette 45/45

DPT MCQ

Flowering in pineapple is promoted by

A

Auxin and ABA

B

Cytokinin and ethylene

C

Auxin and ethylene

D

ABA and cytokinin