MCQ ON ABSCISIC ACID class 12 for NEET | ABSCISIC ACID class 12 | MCQ ABSCISIC ACID with Answer | Check the below NCERT MCQ question for class 12 Biology based on the with Answers.
MCQ on ABSCISIC ACID class 12 Biology with answers were prepared based on the latest pattern. We have provided class 12 Biology MCQs question with Answers to help students understand the concept very well.
MCQ ON ABSCISIC ACID class 12 for NEET
MCQ ON ABSCISIC ACID is useful for NEET / CSIR / UGC / CBSE / ICSE / AIIMS / EXAM / AFMC EXAM / STATE LEVEL MEDICAL EXAM/ KVS PGT BIOLOGY / NVS PGT BIOLOGY EXAM 2022-2023,2024
INTRODUCTION:
ABSCISIC ACID
Carns and Addicott while working on the physiological studies of the shedding of cotton balls found that the chemical substance abscisin.
It is responsible for their shedding. The Abscisic acid can be synthesize in leaves and located to stem apices through phloem.
Physiological effects of abscisic acids:-
Bud dormancy:-
Abscisic acid acts as growth inhibitor and induced by dormancy in a variety of plants. For example the winter bud dormancy is induced by ABA accumulation in the duckwwed plant.
Inhibition of growth:-
ABA is a powerful growth inhibitor. It inhibits Gibberellins stimulated growth.
Seed development and germination :-
ABA accumulates
In embryo of developing seeds. It inhibits formation of germination enzymes in the embryo and it inhibits vivipary.
Abscission:-
Age its name beers historical witness Abscisic acid was originally isolated as hormone responsible for abscission.
Geotropism:-
There are sufficient evidences to support that Abscisic acid controls geotropic responses of roots. It is present in the corn root caps translocates basipetally and stimulates positive geotropic response by acting as inhibitor.
Stomatal closing:-
ABA causes closure of stomata. It inhibits potassium ions uptake by guard cells and promotes the leakage of malic acid.
It results reduction of osmotic active solutes so that guard cell become Flaccid and stromata get closed.
MCQ ABSCISIC ACID class 12 for NEET/KVS PGT BIOLOGY / NVS PGT BIOLOGY EXAM 2022-2023,2024
1. It acts a general plant growth inhibitor and inhibitor of plant metabolism.
(a) auxin
(b) Gibberellins
(c) Cytokinins
(d) ABA
Ans (d) ABA
2. The plant hormone which inhibits seed germination.
(a) starch
(b) autoclaved herring sperm DNA
(c) ABA
(d) ethylene
Ans. (c) ABA
3. Which is a correct statement about Abscisic acid ?
(a) horizontal growth of seedlings
(b) swelling of the axis
(c) stimulates the closure of stomata in the epidermis
(d) cell division
Ans. (c) stimulate the closure of stomata in the epidermis
4. Which is not Function of Abscisic acid ?
(a) fruit ripening
(b) maturation and dormancy
(c) seed development
(d) controls stress hormone
Ans.(a) fruit ripening
5. Function of Abscisic acid is antagonist to
(a) ethylene
(b) Gibberellins
(c) auxins
(d) Cytokinins
Ans.(b) Gibberellins
6. The plant hormone which is also called the stress hormone.
(a) Abscisic acid
(b) ethylene
(c) auxins
(d) Cytokinins
Ans.(a) Abscisic acid
7. The plant hormone which play an important role in seed development, maturation and dormancy?
(a) auxins
(b) Cytokinins
(c) Gibberelins
(d) Abscisic acid
Ans.(d) Abscisic acid
8. The which plant hormone acts a only one kind of interesting control
(a) Abscisic acid
(b) ethylene
(c) Gibberellins
(d) ethylene
Ans.(a) Abscisic acid
9. There are sufficient evidences to support that the plant hormone controls geotropic responses of roots.
(a) auxin
(b) ethephon
(c) Gibberellins
(d) Abscisic acid
Ans. (d) Abscisic acid
10. Which plant hormone causes closer of stomata and it in hits potassium ion update by guard cells and promotes the leakage of malic acid.
(a) Abscisic acid
(b) ethylene
(c) auxins
(d) ethylene
Ans. (a) Abscisic acid
11. The plant hormone which inhibit seed germination even in the presence of cytokinins and Gibberellins
(a) ethephon
(b) auxins
(c) Abscisic acid
(d) Cytokinins
Ans.(c) Abscisic acid
12. Which is the correct statement about Abscisic acid
a) Abscisic acid has found located in mammalian brain tissues
b) causes responses that help protect plant against stresses
c) it takes in the free space on the wall of guard cells and stops potassium ion in take.
(d) all the above
Ans . (d) All the above
13. The plant hormone which plays an important role in plants during water stress and during drought conditions.
(a) Abscisic acid
(b) ethylene
(c) Cytokinins
(d) Gibberelins
Ans.(a) Abscisic acid
14. Fcc cassette promoters senescence in leaves by
(a) loss of chlorophyll pigment
(b) decreasing the rate of photosynthesis
(c) changing the metabolism of proteins and nucleic acids
(d) all the above
Ans. (d) all the above
15. Effects of abscisic acids are
(a) promotion of flowering in some short day plans like strawberry black current
(b) induction of parthenocarpic development in rose
(c) inhibition of Gibberellins mediated synthesis of amylase during germination of cereal grains.
(d) All the above
Ans.(d) All the above
ALSO READ:-
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16. The plant hormone which causes normal embryogenesis and formation of seed storage protein and prevent premature germination of many seeds and buds.
(a) ethylene
(b) Gibberellins
(c) Abscisic acid
(d) auxin
Ans.(c) Abscisic acid
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