MCQ ON CYTOKININS class 12 for NEET | CYTOKININS class 12 | MCQ CYTOKININS with Answer | Check the below NCERT MCQ question for class 12 Biology based on the with Answers.
MCQ on CYTOKININS 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 CYTOKININS class 12 for NEET
MCQ ON CYTOKININS 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:
The cytokinins are plant growth substances which act primarily on cell division and have little or no effect on extension growth. Growth ine elongation mainly result by cell elongation where the growth in width associated with cell division. A cell division factor was isolated by Miller , Skoog .
Physiological effects of cytokinins:
Cell division:-
The most important function of cytokinin is the promotion of cell division. It is now will established that these are true cell division factors. The various amount of cytokinins along beat sufficient auxin is required for growth of calluse in tissue culture experiments.
Cell enlargement:-
Cytokinin can also causes the enlargement of sales in leaf disc and cotyledon. This effect of kinetic can occur in the absence of auxin. Kinetin also causes cell enlargement in tobacco culture and tobacco roots.
Initiation of interfacular cambium:-
The cytokinin can induced the formation of interfascicular cambium in plants.
Morphogenesis:-cytokinin player vital role in morphogenes in plants.
It opposite initiation of roots in steam cuttings treated with auxin and results in the formation of callus in the cut end.
Breaking of dormancy:-
Cytokinin can break the domains of many seeds and also promote their germination.
Delay senescence:-
Senescence is the phenomena in which the mature leaves lose their pigment chlorophyll turn yellow proteins are degraded and ultimatly shed from the plants.
Accumulation and translocation of solutes:-
Plant accumulate solits very actively with a help of cytokinins. Cytokinin help solute translation in phloem.
MCQ CYTOKININS class 12 for NEET/KVS PGT BIOLOGY / NVS PGT BIOLOGY EXAM 2022-2023,2024
1. The hormone have specific effects on cytokinesis
(a) auxin
(b) Gibberellins
(c) Cytokinins
(d) ethylene
Ans (c) Cytokinins
2. Cytokinins have specific effects on cytokinesis and where discovered as Kinetin from the
(a) starch
(b) autoclaved herring sperm DNA
(c) Gibberellins
(d) rosette habit
Ans. (b) autoclave herring sperm DNA
3. Coconut milk contains
(a) NAA
(b) 2-4,D
(c) Gibberelins
(d) cytokinins
Ans. (d) Cytokinins
4. Natural cytokinins are synthesized in the region where rapid………….occurs
(a) auxins
(b) ethylene
(c) Gibberelins
(d) cell division
Ans.(d) cell division
5. The hormone which help over come the apical dominance
(a) cytokinin
(b) Gibberelins
(c) auxins
(d) ethylene
Ans.(a) Cytokinins
6. The hormone promotes nutrient mobilisation with help in the delay of leaf senescence.
(a) ethylene
(b) Cytokinins
(c) auxins
(d) GA3
Ans.(b) Cytokinins
7. Which hormone can break the dormancy of many seeds and also promote their germination
(a) auxins
(b) Cytokinins
(c) Gibberelins
(d) ethylene
Ans.(b) Cytokinins
8. The phenomenon of delaying senescence by cytokinins is known as
(a) Richmond land effect
(b) Allen effect
(c) Lang effect
(d) Skoog effect
Ans.(a) Richmond – land effect.
9. External application of ………….. hormonepromote the growth of lateral birds even the apical bud is intact.
(a) ethylene
(b) auxins
(c) Gibberellins
(d) Cytokinins
Ans. (d) Cytokinins
10. The most important function of cytokinine is to promotion of
(a) apical dominance
(b) lateral buds formation
(c) axillary buds formation
(d) cellular division
Ans. (d) cellular division
11. The plant hormone which can induced the formation of interfascicular cambium in plants
(a) ethylene
(b) auxins
(c) Gibberellins
(d) Cytokinins
Ans.(d) Cytokinins
12. Phenomena in which the mature leaves lose their pigment chlorophyll turn yellow, proteins are degrade ultimately they shed from the plants
a) Ethylene
b) 2,4-D
c) Cytokinins
(d) Gibberelins
Ans . (c) Cytokinins
13. Milky endosperm of corn contains
(a) ABA
(b) GA3
(c) Cytokinins
(d) Gibberelins
Ans.(c) Cytokinins
14. The hormone which increases the shelf life of vegetables and cut flowers
(a) Cytokinins
(b) ethylene
(c) Gibberelins
(d) auxins
Ans. (a) Cytokinins
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15. Cytokinins are substituted adenine compounds that promotes cell division in tissue growth in vitro ,such as culture from
(a) tobacco pith
(b) carrot phylum
(c) soyabean stems
(d) all the above
Ans.(d) All the above
16. Effects of cytokinine are
(a) induction of plastid differentiation
(b) differentiation of interfascicular cambium and lignification
(c) resistance to plants under high temperatures
(d) all the above
Ans.(d) all the above
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