PrepBharat

1. Kinetin is ________
a) Cytokinins
b) Modified form of adenine
c) Purine
d) All of these

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2.Kinetin was first discovered from
a) Corn kernels
b) Autoclaved herring sperm DNA
c) Coconut milk
d) All of these

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3.Naturally kinetin occurs in
a) Coconut milk
b) Pineapple
c) Corn
d) None of these

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4. The naturally available cytokinin like substance is
a) Kinetin
b) Zeatin
c) Both (a) and (b)
d) None of these

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5. Zeatin was isolated from what?
a) Corn kernels
b) Coconut milk
c) Both (a) and (b)
d) None of these

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6. Where are natural cytokinins synthesized?
a) Areas of rapid cell division
b) Areas undergoing differentiation
c) Both (a) and (b)
d) None of these

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7. How many of the following PGRs help to overcome apical dominance?
Auxins, Gibberellins, Cytokinins, Ethylene
a) 1
b) 2
c) 3
d) 4

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8. How many of the following PGRs help in delay of senescence?
Auxins, Gibberellins, Cytokinins, Ethylene
a) 1
b) 2
c) 3
d) 4

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9. A plant tissue is undergoing senescence, which PGR would be found in it?
a) Auxins
b) Gibberellins
c) Cytokinins
d) Ethylene

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10. Large amounts of ethylene is synthesized in
a) Ripening fruit
b) Newly grown leaf
c) Apex
d) Axial bud

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11. What are the influences of ethylene on plants?
a) Horizontal growth of seedlings
b) Swelling of the axis
c) Apical hook formation in dicot seedling
d) All of these

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12.What is the of effect of ethylene on plant organs, especially leaves and flowers?
a) Promotes abscission
b) Promotes senescence
c) Both (a) and (b)
d) None of these

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13. What is the effect of ethylene on ripening fruit?
a) Increases rate of growth
b) Increase in rate of respiration
c) Both (a) and (b)
d) None of these

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14. Rise in the rate of respiration is called
a) Respiratory climax
b) Respiratory rise
c) Respiratory climactic
d) None of these

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15. Which of the following PGR is used to break seed and bud dormancy?
a) Auxins
b) Gibberellins
c) Cytokinins
d) Ethylene

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16. Ethylene initiates germination in which seed?
a) Mustard
b) Peanut
c) Both (a) and (b)
d) None of these

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17. Sprouting of potato tubers is initiated by which of the following PGR?
a) Cytokinin
b) Ethylene
c) Both (a) and (b)
d) None of these

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18. How does ethylene help plants to increase their absorption surface?
a) Promotes growth of root
b) Promotes formation of root hair
c) Both (a) and (b)
d) None of these

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19. Ethylene is used to initiate flowering and for synchronizing fruit set in which fruit?
a) Apple
b) Pineapple
c) Banana
d) All of these

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20. Ethylene induces flowering in which fruit?
a) Mango
b) Apple
c) Pineapple
d) All of these

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21. Which of the following is the most widely used PGR in agriculture?
a) IAA
b) ABA
c) \[GA_{3}\]
d) Ethylene

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22. Which of the following is a characteristic of ethephon?
a) Readily absorbed
b) Transported within the plant
c) Releases ethylene slowly
d) All of these

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23.Ethephon hastens fruit ripening in
a) Mango
b) Tomato
c) Apple
d) Both (b) and (c)

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24. Ethephon accelerates abscission in flowers and fruits like
a) Cherry
b) Walnut
c) Cotton
d) All of these

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25. How does ethephon increase the yield of cucumber?
a) Promotes senescence
b) Promotes female flowers
c) Promotes male flowers
d) Both (a) and (b)

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26. For which role ABA was discovered?
a) Abscission
b) Dormancy
c) Both (a) and (b)
d) Ripening fruits

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27. What are the actions of ABA?
a) General plant growth inhibitor
b) Inhibitor of plant metabolism
c) Stimulates the closure of stomata in epidermis
d) All of these

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28. Why is ABA called stress hormone?
a) Removes various stresses from plant
b) Increase tolerance of plant to various kind of stresses
c) Both (a) and (b)
d) None of these

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29.ABA plays an important role in all except
a) Seed development
b) Maturation
c) Dormancy
d) Germination

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30. What is/are the factors that depicts unfavorable growth of seeds?
a) Desiccation
b) Air
c) Carbon dioxide
d) All of these

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31. ABA is antagonist to
a) IBA
b) IAA
c) \[GA_{2}\]
d) All of these

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32. All are types of roles played by PGR except
a) Individualistic
b) Synergistic
c) Both (a) and (b)
d) None of these

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33. Which of the following events are controlled by extrinsic factors via PGR?
a) Vernalisation
b) Flowering
c) Dormancy
d) All of these

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34. All are extrinsic factors for growth and development except
a) Temperature
b) Light
c) Both (a) and (b)
d) Nutrition

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35. What kind of plants require the exposure to light for a period exceeding a well defined critical duration?
a) Short day plants
b) Day-neutral plants
c) Long day plants
d) None of these

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36. What kind of plants require the exposure to light for a period less than critical duration?
a) Short day plants
b) Day-neutral plants
c) Long day plants
d) None of these

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37. Plants with no such correlation between exposure to light duration and induction of flower response are called
a) Long day plant
b) Day-neutral plants
c) Short day plant
d) None of these

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38. What is more important of these?
a) Light period
b) Dark period
c) Both (a) and (b)
d) None of these

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39. According to Hypothesis, which substances are responsible for photoperiodism?
a) Hormonal substance
b) Abscisic acid
c) Gibberellins
d) All of these

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40. When flowering is either quantitatively or qualitatively dependent or exposure to low temperature it is called ____ phenomenon.
a) Photoperiodism
b) Thermoperiodism
c) Vernalization
d) Dormancy

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