61.
Highest auxin concentration occurs
A
in growing tips
B
in leaves
C
at base of plant organs
D
in xylem and phloem
Answer :
in growing tips
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62.
Apical dominace means
A
Suppression of growth of apical bud by axillary buds
B
Suppression of growth of axillary buds by the presence of apical bud.
C
Stimulation of growth of axillary buds by removal of apical bud
D
Inhibition of growth of axilary buds by removal of apical bud
Answer :
Suppression of growth of axillary buds by the presence of apical bud.
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63.
In a growing plant, the first hapse during the process of growth is
A
Cell division
B
Cell enlargement
C
Cell differentiation
D
Cell maturation
Answer :
Cell division
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64.
The method that renders the seed coat permeable to water so that embryo expansion is not physically retarded is
A
vernalization
B
stratification
C
denudation
D
scarification
Answer :
scarification
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65.
Abscisic acid causes
A
stomatal closure
B
stem elongation
C
leaf expansion
D
root elongation
Answer :
stomatal closure
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66.
Curcurbitaceae is good example of
A
Haptotropism
B
Thigmotropism
C
A and B both
D
None of the above
Answer :
A and B both
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67.
Supra optima (more than 10 PPM) concentration of Auxins
A
Promotes flowering
B
Kill the plant
C
Prevents shortening of the internodes
D
Promotes growth in both stem and roots apex
Answer :
Kill the plant
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68.
Effect of day lenght of plant development is called
A
Phototropism
B
Phtoperiodism
C
Chemotropism
D
Photosynthesis
Answer :
Phtoperiodism
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69.
What will be the effect on phytochrome in a plant subjected to continuous red light?
A
Level of phytochrome decreases
B
Phytochrome is destroyed
C
Phytochrome synthesis increases
D
Destruction and synthesis of phytochrome remain in equilibrium
Answer :
Level of phytochrome decreases
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70.
The plant hormone, which synthesized in root and translocated to aerial parts is
A
Auxin
B
Cytokinin
C
Traumatin
D
Morphactins
Answer :
Cytokinin
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