MCQs *
Question. 78% From NCERT NEET - 2021
The plant hormone used to destroy weeds in a field is:
(1) 2, 4-D
(2) IBA
(3) IAA
(4) NAA
Answer
1
Question. 71% From NCERT NEET - 2021
Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called:
(1) Plasticity
(2) Maturity
(3) Elasticity
(4) Flexibility
Answer
1
Question. 74% From NCERT NEET - 2021 NEET - 2019
The site of perception of light in plants during photoperiodism is:
1. Axillary bud
2. Leaf
3. Shoot apex
4. Stem
Answer
2
Question. 76% From NCERT NEET - 2020
Which of the following is not an inhibitory substance governing seed dormancy?
1. Abscisic acid
2. Phenolic acid
3. Para-ascorbic acid
4. Gibberellic acid
Answer
4
Question. 82% From NCERT NEET - 2020
Who coined the term 'Kinetin'?
1. Skoog and Miller
2. Darwin
3. Went
4. Kurosawa
Answer
1
Auxin was identified by - Darwins & isolated by- F.W.Went
Question. 59% From NCERT NEET - 2020
Inhibitory substances in dormant seeds cannot be removed by subjecting seeds to:
1. Gibberellic acid
2. Nitrate
3. Ascorbic acid
4. Chilling conditions
Answer
3
Question. 84% From NCERT NEET - 2020
Match the following concerning the activity/function and the phytohormone involved :-
(a) Fruit ripener (i) Abscisic acid
(b) Herbicide (ii) GA 3
(c) Bolting agent (iii) 2, 4-D
(d) Stress hormone (iv) Ethephon
Select the correct option from following :-
1. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
2. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
3. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
4. (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
Answer
3
Question. 72% From NCERT NEET - 2019
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?
1. Cytokinin and Abscisic acid
2. Auxin and Ethylene
3. Gibberellin and Cytokinin
4. Gibberellin and Abscisic acid
Answer
2
Question. 84% From NCERT NEET - 2019
Removal of shoot tips is a very useful technique to boost the production of tea- leaves. This is because
1. Gibberellins prevent bolting and are inactivated.
2. Auxins prevent leaf drop at early stages.
3. Effect of auxins is removed and growth of lateral buds is enhanced.
4. Gibberellins delay senescence of leaves.
Answer
3
Question. 82% From NCERT NEET - 2016
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?
(1) IAA and gibberellin
(2) Auxin and cytokinin
(3) Auxin and abscisic acid
(4) Glbberellin & abscisic acid
Answer
2
Question. 67% NEET - 2016
Phytochrome is a
(1) flavoprotein
(2) glycoprotein
(3) lipoprotein
(4) chromoprotein
Answer
4
Question. 78% NEET - 2016 From NCERT
The Avena curvature is used for bioassay of
(1) GA3
(2) IAA
(3) Ethylene
(4) ABA
Answer
Question. 86% NEET - 2015 From NCERT
Auxin can be bioassayed by
1. Avena coleoptile curvature
2. hydroponics
3. potometer
4. lettuce hypocotyl elongation
Answer
1
Question. 52% NEET - 2014 From NCERT
Dr. F Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly cut coleoptile stumps. Of what significance is this experiment?
1. It made possible the isolation and exact identification of auxin.
2. It is the basis for quantitative determination of small amounts of growth-promoting substances
3. It demonstrated polar movement of auxins
4. It supports the hypothesis that IAA is auxin
Answer
1
Question. 68% NEET - 2014
A few normal seedlings of tomato were kept in a dark room. After a few days they were
found to have become white-coloured like albinos. Which of the following terms will you
use to describe them?
1. Mutated
2. Embolised
3. Etiolated
4. Defoliated
Answer
3
Question.From NCERT
Answer
c
Question.NEET - 2013
During seed germination its stored food is mobilised by.
1. ethylene
2. cytokinin
3. ABA
4. gibberellin
Answer
4
Question. 76% NEET - 2010 NEET - 2008
Photoperiodism was first characterised in :-
1. tobacco
2. potato
3. tomato
4. cotton
Answer
1
Question. Solved by 83% From NCERT NEET - 2009
One of the synthetic auxin is
1. NAA
2. IAA
3. GA
4. IBA
Answer
1
Question. Solved by 75% From NCERT NEET - 2009
Which one of the following acids is a derivative of carotenoids?
1. Indole-butyric acid
2. Indole-3-acetic acid
3. Gibberellic acid
4. Abscisic acid
Answer
4
Question. 70% NEET - 2008
Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in
1. vessels and tracheid differentiation
2. leaf abscission
3. annual plants
4. floral parts
Answer
2
Question. NEET - 2010 NEET - 2008
Importance of day length in flowering of plants was first shown in
1. Lemna
2. tobacco
3. cotton
4. Petunia
Answer
2
Question. From NCERT NEET - 2007
Which one of the following pairs, is not correctly matched?
1. Abscisic acid - Stomatal closure
2. Gibberellic acid - Leaf fall
3. Cytokinin - Cell division
4. IAA - Cell wall elongation
Answer
2
Question.NEET - 2006
Treatment of seed at low temperature under moist conditions to break its dormancy is called ?
1. scarification
2. vernalization
3. chelation
4. stratification
Answer
4
Question. NEET - 2006 AIPMT - 2006
An enzyme that can stimulate germination of barley seeds is:-
1. α-amylase
2. lipase
3. protease
4. invertase
Answer
1
Question. AIPMT - 2006
Parthenocarpic tomato fruits can be produced by:
1. removing androecium of flowers before pollen grains are released
2. treating the plants with low concentrations of gibberellic acid and auxins
3. raising the plants from vernalised seeds
4. treating the plants with phenylmercuric acetate
Answer
2
Question. AIPMT - 2006
An enzyme that can stimulate germination of barley seeds is:
1. -amylase
2. lipase
3. protease
4. invertase
Answer
1
Question. From NCERT NEET - 2017
Fruit and leaf drop at early stages can be prevented by the application of
1. Cytokinins
2. ethylene
3. auxins
4. gibberellic acid
Answer
3
Question. From NCERT
Which of the following is not an action of ethylene?
1. Induces leaf abscission
2. Inhibits root hair growth - decreasing the efficiency of water and mineral absorption
3. Induces the growth of adventitious roots during flooding
4. Stimulates epinasty - leaf petiole grows out, leaf hangs down and curls into itself
Answer
2
Question. From NCERT
The formation of interfascicular cambium in plants is due to:-
1. Non-differentiation
2. Re-differentiation
3. Differentiation
4. De-differentiation
Answer
4
Question. From NCERT
Gibberellic acid is a/an:-
1. lndole compound
2. Terpene
3. Adenine derivative
4. Carotenoid
Answer
2
Question. From NCERT
The PGR used to initiate flowering and for synchronizing fruit-set in pineapples is:
1. Abscisic acid
2. Cytokinin
3. Auxin
4. Ethylene
Answer
4
Question.
A flash of red light followed by a flash of far-red light given during the middle of the night to a short-day plant will likely
1. cause increased flower production.
2. have no effect upon flowering.
3. inhibit flowering.
4. stimulate flowering.
Answer
2
Question. From NCERT
At the root apex the cells of the meristematic region are not characterized by:-
1. Being rich in protoplasm
2. Abundant plasmodesmatal connections
3. A cell wall that is primary in nature
4. Having small inconspicuous nuclei
Answer
4
Question. From NCERT
Identify the option where all the columns are not correctly matched:
| PGR | Nature | Actions |
1. | Auxin | Indole compounds | Apical dominance, Flowering in pineapples, Parthenocarpy in tomatoes |
2. | Cytokinin | Adenine derivative |
Cell division, Adventitious shoot formation, Delay in leaf senescene |
3. | Gibberellin | Terpene | Increase in length |
4 . | ABA | Carotenoid derivative | Closure of stomata in water stress, inducing seed dormancy, inducing flowering in mango |
Answer
4
Flowering in Mango by Ethylene.
Question. From NCERT
The PGR used to induce parthenocarpy in tomatoes is:-
1. Auxin
2. Gibberellin
3. Cytokinin
4. ABA
Answer
1
Question. From NCERT AIIMS - 2001
Induction of flowering by low temperature in plants is
1. cryobiology
2. vernalization
3. phototropism
4. pruning.
Answer
2
Question. From NCERT AIIMS - 2002
Bud dormancy is induced by:-
1. ABA
2. ethylene
3. IAA
4. gibberellic acid.
Answer
1
Question. From NCERT AIIMS - 2012
Abscisic acid is known as the stress hormone because it
(1) breaks seed dormancy
(2) induces flowering
(3) promotes leaf fall
(4) promotes closure of stomata
Answer
4
Question. AIIMS - 2015
Gibberellins can promote seed germination because of their influence on
(1) rate of cell division
(2) production of hydrolyzing enzymes
(3) synthesis of abscisic acid
(4) absorption of water through hard seed coat
Answer
2
Question. From NCERT AIIMS - 2016
One hormone hastens maturity period in juvenile conifers, a second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses.They are respectively:-
(1) Gibberellin, Auxin, Ethylene
(2) Auxin, Gibberellin, Cytokinin
(3) Gibberellin, Auxin, ABA
(4) Auxin, Gibberellin, ABA
Answer
3
Question.AIIMS - 2017
Identfy the incorrect option for effects of the red and far red light.
Red light | Far Red Light |
(1) stimulates germination (2) inhibits flowering in short day plants (3) causes epicotyls hook to unbend (4) Inhibits the formation of anthocyanins |
|
Answer
4
Question.From NCERT AIIMS - 2016
In the process of apical dominance, lateral buds are unable to grow in the presence of apical bud. This is due to:-
(1) less amount of cytokinins in lateral buds
(2) more amount of cytokinins in lateral buds
(3) less amount of auxin in lateral buds
(4) more amount of auxin in lateral buds
Answer
3
Question. AIIMS - 2015
Refrigerated fruits maintain flavour and taste for longer period due to:-
(1) non-availability of O2
(2) the presence of excess of CO2
(3) the presence of excess humidity
(4) slower rate of respiration
Answer
4
Question.AIIMS - 2015
The biological clock measures the length at each night by the?
(1) relative amount of red absorbing and far-red absorbing phytochrome present at dawn
(2) amount of far-red absorbing phytochrome at dusk
(3) relative amount of red absorbing and far-red absorbing phytochrome at mid day
(4) rate at which are kind of phytochrome is converted to the other
Answer
1
Question. AIIMS - 2014
Hypothetical plant hormones are:-
(1) florigen
(2) vernalin
(3) florigen and vernalin
(4) auxin
Answer
3
Question. AIIMS - 2013
Organogenesis or morphogenesis in tissue culture is controlled/regulated by phytohormones the credit of this important discovery goes to
(1) Skoog and Miller (1957)
(2) Guha and Maheswari (1964)
(3) Calvin and Benson (1894)
(4) Halperin and Wetherall (1964)
Answer
Question. AIIMS - 2013
Which one plant movement is unidirectional?
(1) Phototaxis
(2) Chemotaxis
(3) Both (a) and (b)
(4) Thigmotrophism
.
Answer
Question. From NCERT
Plant Growth Regulators (PGRs) are not
1. Very less in number in plants
2. Small and simple molecules
3. Diverse chemical composition
4. Plant hormones or phytohormones
Answer
1
Question. From NCERT
N6- furfurylamino purine and kinetin are derivative of …….
1.Indol compounds
2.Adenine
3.carotenoids
4.Terpenes
Answer
2
