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NEET CRASH COURSE PAPER -12 | Plant Growth and Development
1 . Match the items in column I with those in column II , and choose the correct answer .
Column I Column II
P. Control of weeds ( i )Gibberellin
Q. Induction of germination ( ii ) Cytokinin
R. Ripening of fruit ( iii ) 2,4 - D
S. Delaying of senescence ( iv ) Ethylene
( a ) P- ( ii ) , Q- ( iv ) , R- ( iii ) , S- ( i )
( b ) P- ( iii ) , Q- ( i ) , R- ( iv ) , S- ( ii )
( c ) P- ( i ) , Q- ( ii ) , R- ( iv ) , S- ( iii )
( d ) P- ( ii ) , Q- ( iii ) , R- ( i ) , S- ( iv )
2. Exponential growth in plants can be expressed as
( a ) L₁ = L0 + rt
( b ) Le = L₁ rt
( c ) W₁ = W0 ert
( d ) W₁ = W0 e rt .
3 . Which of the following is not an effect of ethylene ?
( a ) Promotes senescence and abscission of plant organs .
( b ) Breaks seed and bud dormancy .
( c ) Brings about horizontal growth of seedlings .
( d ) Helps to overcome apical dominance .
4 .Vernalisation stimulates flowering in
( a ) zamikand
( b ) turmeric
( c ) carrot
( d ) ginger .
5 .Hormone working antagonistic to ABA is
( a ) gibberellin
( b ) cytokinin
( c ) ethylene
( d ) all of these .
6 .The viability of seeds is tested by
( a ) 2,6 dichlorophenol indophenols
( b ) 2 , 3 , 5 triphenyl tetrazolium chloride
( c ) DMSO
( d ) safranine .
7 . Seeds of winter varieties are benefitted by this method
( a ) senescence
( b ) abscission
( c ) photoperiodism
( d ) vernalisation .
8 . Richmond - Lang effect can be observed in plants by the treatment of
( a ) cytokinin
( b ) ethylene
( c ) abscisic acid
( d ) gibberellins .
9 . Internodal elongation is associated with
( a ) auxin
( b ) cytokinin
( c ) gibberellin
( d ) ABA .
10. Which one of the following hormones is responsible for foolish seedling disease of rice ?
( a ) Gibberellin
( b ) IAA
( c ) Ethylene
( d ) Cytokinin
11. Which one of the following auxins will not produce parthenocarpic fruits ?
( a ) Indole butyric acid ( IBA )
( b ) 2,4 - dichlorophenoxy acetic acid ( 2,4 - D )
( c ) Indole acetic acid ( IAA )
( d ) NAA
12. Importance of day length in flowering of plants was first shown in
( a ) cotton
( b ) Petunia
( c ) Lemna
( d ) tobacco .
13. One set of the plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower . Under which one of the following categories will you place this plant ?
( a ) Long day
( b ) Darkness neutral
( c ) Day neutral
( d ) Short day
14. Phytochrome in plants is sensitive to
( a ) green light
( b ) blue light
( c ) red light
( d ) red and far red light .
15. Flowering in short day plant is induced by
( a ) short day and interrupted long night
( b ) short night
( c ) long day with interrupted night
( d ) none of the above .
16. Removal of seeds coat , in dormant seeds , by mechanical methods is called
( a ) separation
( b ) emasculation
( c ) vernalisation
( d ) scarification .
17. Etiolation in plants is caused when
( a ) they are grown in dark
( b ) they have mineral deficiency
( c ) they are grown in intense light
( d ) they are grown in blue light .
18. The low temperature treatment that shortens the period between sowing and the flowering is called
( a ) chemotaxy
( b ) freezing injury
( c ) vernalisation
( d ) devernalisation .
19. A long day plant flowers only if exposed to a light period
( a ) more than its critical day length
( b ) less than its critical day length
( c ) equal to its critical day length
( d ) slightly less than its critical day length .
20. Growth in numbers is maximum in the zone of
( a ) cell maturation
( b ) cell division
( c ) cell elongation
( d ) all of these .
21. Differentiation of callus requires a specific ratio of two hormones
( a ) auxin and gibberellin
( b ) auxin and abscisic acid
( c ) gibberellin and abscisic acid
( d ) IAA and cytokinin .
22. Gibberellic acid induces flower
( a ) in short day plants under long day conditions
( b ) in day - neutral plants under dark conditions
( c ) in some gymnospermic plants only
( d ) in long day plants under short day conditions .
23. Which breaks dormancy of potato tuber ?
( a ) Gibberellin
( b ) IAA
( c ) ABA
( d ) Zeatin
24. Gibberellins can promote seed germination because of their influence on
( a ) rate of cell division
( b ) production of hydrolysing enzymes
( c ) synthesis of abscisic acid
( d ) absorption of water through hard seed coat .
25. A hormone delaying sencescence is
( a ) auxin
( b ) cytokinins
( c ) ethylene
( d ) gibberellin .
26. Auxin is synthesised in which part of the plant
( a ) Apical
( b ) Nodal
( c ) Internodal
( d ) Axillary
27. The hormone , which causes stunted growth in pea is
( a ) ethylene
( b ) auxin
( c ) cytokinin
( d ) abscisic acid .
28. In germinating seed food supply is done by
( a ) auxin
( b ) gibberellin
( c ) cytokinin
( d ) ethylene .
29. The bioassay of auxin is
( a ) culture of fungus
( b ) seed dormancy
( c ) Avena curvature test
( d ) callus formation .
30. Which of the following phytohormones is not naturally occuring ?
( a ) IAA
( b ) Gibberellic acid
( c ) 2,4 - D
( d ) 6- furfuryl amino purine
31. " Foolish seedling disease " of rice in Japan was caused by
( a ) the deficiency of nitrogen
( b ) a bacterium
( c ) a fungus
( d ) a virus .
32. Which hormone enhances seed germination by enhancing α - amylase synthesis ?
( a ) Auxins
( b ) Gibberellins
( c ) Cytokinins
( d ) ABA
33. Match the phytohormones given in Column I with their functions given in Column II . Choose the answer with correct combination of alphabets
Column I Column II
( Phytohormones ) ( Functions )
i . Auxins p . breaking seed dormancy
ii . Gibberellins q . inducing fruit ripening
iii . Cytokinins r . formation of abscission layer
iv . Ethylene S. root initiation
t . chloroplast development and chlorophyll synthesis .
(i) (ii) (iii) (iv)
( a ) p r q s
( b ) r s p t
( c ) s p t q
( d ) s t r q
34. Leaf abscission , fruit fall , bud dormancy occurs by which phytohormone ?
( a ) Auxin
( b ) Cytokinin
( c ) Gibberellins
( d ) Abscisic acid
35. Compare the statements A and B
Statement A : Auxins promote apical dominance by suppressing the activity of lateral buds .
Statement B : In moriculture , periodic pruning of shoot tips is done to make mulberry plants bushy Select the correct description .
( a ) Statement A is wrong and B is correct .
( b ) Both the statements A and B are correct and A is not the reason for B.
( c ) Both the statements A and B are correct and A is the reason for B.
( d ) Statement A is correct and B is wrong .
36. Refer the given figures on photoperiodism and select the correct option .
Column I Column II
P. Control of weeds ( i )Gibberellin
Q. Induction of germination ( ii ) Cytokinin
R. Ripening of fruit ( iii ) 2,4 - D
S. Delaying of senescence ( iv ) Ethylene
( a ) P- ( ii ) , Q- ( iv ) , R- ( iii ) , S- ( i )
( b ) P- ( iii ) , Q- ( i ) , R- ( iv ) , S- ( ii )
( c ) P- ( i ) , Q- ( ii ) , R- ( iv ) , S- ( iii )
( d ) P- ( ii ) , Q- ( iii ) , R- ( i ) , S- ( iv )
2. Exponential growth in plants can be expressed as
( a ) L₁ = L0 + rt
( b ) Le = L₁ rt
( c ) W₁ = W0 ert
( d ) W₁ = W0 e rt .
3 . Which of the following is not an effect of ethylene ?
( a ) Promotes senescence and abscission of plant organs .
( b ) Breaks seed and bud dormancy .
( c ) Brings about horizontal growth of seedlings .
( d ) Helps to overcome apical dominance .
4 .Vernalisation stimulates flowering in
( a ) zamikand
( b ) turmeric
( c ) carrot
( d ) ginger .
5 .Hormone working antagonistic to ABA is
( a ) gibberellin
( b ) cytokinin
( c ) ethylene
( d ) all of these .
6 .The viability of seeds is tested by
( a ) 2,6 dichlorophenol indophenols
( b ) 2 , 3 , 5 triphenyl tetrazolium chloride
( c ) DMSO
( d ) safranine .
7 . Seeds of winter varieties are benefitted by this method
( a ) senescence
( b ) abscission
( c ) photoperiodism
( d ) vernalisation .
8 . Richmond - Lang effect can be observed in plants by the treatment of
( a ) cytokinin
( b ) ethylene
( c ) abscisic acid
( d ) gibberellins .
9 . Internodal elongation is associated with
( a ) auxin
( b ) cytokinin
( c ) gibberellin
( d ) ABA .
10. Which one of the following hormones is responsible for foolish seedling disease of rice ?
( a ) Gibberellin
( b ) IAA
( c ) Ethylene
( d ) Cytokinin
11. Which one of the following auxins will not produce parthenocarpic fruits ?
( a ) Indole butyric acid ( IBA )
( b ) 2,4 - dichlorophenoxy acetic acid ( 2,4 - D )
( c ) Indole acetic acid ( IAA )
( d ) NAA
12. Importance of day length in flowering of plants was first shown in
( a ) cotton
( b ) Petunia
( c ) Lemna
( d ) tobacco .
13. One set of the plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower . Under which one of the following categories will you place this plant ?
( a ) Long day
( b ) Darkness neutral
( c ) Day neutral
( d ) Short day
14. Phytochrome in plants is sensitive to
( a ) green light
( b ) blue light
( c ) red light
( d ) red and far red light .
15. Flowering in short day plant is induced by
( a ) short day and interrupted long night
( b ) short night
( c ) long day with interrupted night
( d ) none of the above .
16. Removal of seeds coat , in dormant seeds , by mechanical methods is called
( a ) separation
( b ) emasculation
( c ) vernalisation
( d ) scarification .
17. Etiolation in plants is caused when
( a ) they are grown in dark
( b ) they have mineral deficiency
( c ) they are grown in intense light
( d ) they are grown in blue light .
18. The low temperature treatment that shortens the period between sowing and the flowering is called
( a ) chemotaxy
( b ) freezing injury
( c ) vernalisation
( d ) devernalisation .
19. A long day plant flowers only if exposed to a light period
( a ) more than its critical day length
( b ) less than its critical day length
( c ) equal to its critical day length
( d ) slightly less than its critical day length .
20. Growth in numbers is maximum in the zone of
( a ) cell maturation
( b ) cell division
( c ) cell elongation
( d ) all of these .
21. Differentiation of callus requires a specific ratio of two hormones
( a ) auxin and gibberellin
( b ) auxin and abscisic acid
( c ) gibberellin and abscisic acid
( d ) IAA and cytokinin .
22. Gibberellic acid induces flower
( a ) in short day plants under long day conditions
( b ) in day - neutral plants under dark conditions
( c ) in some gymnospermic plants only
( d ) in long day plants under short day conditions .
23. Which breaks dormancy of potato tuber ?
( a ) Gibberellin
( b ) IAA
( c ) ABA
( d ) Zeatin
24. Gibberellins can promote seed germination because of their influence on
( a ) rate of cell division
( b ) production of hydrolysing enzymes
( c ) synthesis of abscisic acid
( d ) absorption of water through hard seed coat .
25. A hormone delaying sencescence is
( a ) auxin
( b ) cytokinins
( c ) ethylene
( d ) gibberellin .
26. Auxin is synthesised in which part of the plant
( a ) Apical
( b ) Nodal
( c ) Internodal
( d ) Axillary
27. The hormone , which causes stunted growth in pea is
( a ) ethylene
( b ) auxin
( c ) cytokinin
( d ) abscisic acid .
28. In germinating seed food supply is done by
( a ) auxin
( b ) gibberellin
( c ) cytokinin
( d ) ethylene .
29. The bioassay of auxin is
( a ) culture of fungus
( b ) seed dormancy
( c ) Avena curvature test
( d ) callus formation .
30. Which of the following phytohormones is not naturally occuring ?
( a ) IAA
( b ) Gibberellic acid
( c ) 2,4 - D
( d ) 6- furfuryl amino purine
31. " Foolish seedling disease " of rice in Japan was caused by
( a ) the deficiency of nitrogen
( b ) a bacterium
( c ) a fungus
( d ) a virus .
32. Which hormone enhances seed germination by enhancing α - amylase synthesis ?
( a ) Auxins
( b ) Gibberellins
( c ) Cytokinins
( d ) ABA
33. Match the phytohormones given in Column I with their functions given in Column II . Choose the answer with correct combination of alphabets
Column I Column II
( Phytohormones ) ( Functions )
i . Auxins p . breaking seed dormancy
ii . Gibberellins q . inducing fruit ripening
iii . Cytokinins r . formation of abscission layer
iv . Ethylene S. root initiation
t . chloroplast development and chlorophyll synthesis .
(i) (ii) (iii) (iv)
( a ) p r q s
( b ) r s p t
( c ) s p t q
( d ) s t r q
34. Leaf abscission , fruit fall , bud dormancy occurs by which phytohormone ?
( a ) Auxin
( b ) Cytokinin
( c ) Gibberellins
( d ) Abscisic acid
35. Compare the statements A and B
Statement A : Auxins promote apical dominance by suppressing the activity of lateral buds .
Statement B : In moriculture , periodic pruning of shoot tips is done to make mulberry plants bushy Select the correct description .
( a ) Statement A is wrong and B is correct .
( b ) Both the statements A and B are correct and A is not the reason for B.
( c ) Both the statements A and B are correct and A is the reason for B.
( d ) Statement A is correct and B is wrong .
36. Refer the given figures on photoperiodism and select the correct option .
l( a ) no correlation between light period and flowering = long light exposure period = short light exposure period
( b ) long light exposure period = no correlation between light period and flowering = short light exposure period
( c ) short light exposure period = long light exposure period = no correlation between light period and flowering
( d ) no correlation between light period and flowering = short light exposure period = long light exposure period
37. Which of the following is a long day plant ?
( a ) Glycine max
( b ) Spinach
( c ) Chrysanthemum
( d ) Tobacco
38. Which one of the following synthetic growth regulators is used to promote synchronised flowering in pineapple ?
( a ) Benzyl aminopurine
( b ) Phenylmercuric acetate
( c ) Indolebutyric acid
( d ) 2 - chloroethylphosphonic acid
39. Auxanometer is used to measure
( a ) the growth in length of a plant organ
( b ) the growth in breadth of a plant organ
( c ) population of the pests attacking a plant
( d ) both ( a ) and ( b ) .
40. Biological clock in plants is controlled by
( a ) phytochrome
( b ) cryptochrome
( c ) both ( a ) and ( b )
( d ) gibberellin .
41. One hormone is used to speed up the malting process in barley , another is used to promote flowering in pineapple , while the third helps in the delay of leaf senescence . These are respectively
( a ) auxin , gibberellin and cytokinin
( b ) gibberellin , cytokinin and auxin
( c ) gibberellin , auxin and cytokinin
( d ) cytokinnin , auxin and gibberellin
42. Which of the following is not a physiological effect of auxin ?
( a ) Initiates rooting in stem cuttings
( b ) Promotes flowering .
( c ) Prevents fruit and leaf drop at early stages .
( d ) Promotes bolting .
43. A good example of an auxin herbicide is
( a ) IAA
( b ) 2,4 - D
( c ) NAA
( d ) IBA
44. Differentiation of shoot is controlled by
( a ) high auxin : low cytokinin ratio
( b ) high cytokinin : low auxin ratio
( c ) high gibberellin : low auxin ratio
( d ) high gibberellin : low cytokinin ratio
45. Auxins originates at the tip of the stem and controls growth elsewhere . The movement of auxin is largely
( a ) basipetal
( b ) acropetal
( c ) acropetal and basipetal
( d ) centropetal
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Ans key
1. B, 2.C, 3.D, 4.C, 5.A, 6.B, 7.D, 8.A, 9.C, 10.A, 11.B, 12.D, 13.D, 14.D 15.D, 16.D, 17.A, 18.C, 19.A, 20.B, 21.D, 22.D, 23.A, 24.B, 25.B, 26.A, 27.A, 28.B, 29.C, 30.C, 31.C, 32.B, 33.C, 34.D, 35.C, 36.A, 37.B, 38.D, 39.A, 40.C, 41.C, 42.D, 43.B, 44.B, 45.A
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