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71. Assertion (A) : The sympathetic nervous system prepares the body to meet any emergency situation. Reason (R) : The sympathetic nervous system is stimulated by the hormone oxytocin during emergency situation. Select the correct option from the given altematives (NTSE Karnataka, Stage-I, 2016-17)
Both 'A' and 'R' are true and 'R' explains 'A'
Both 'A' and 'R' are true but 'R' doesn't explain 'A'
'A' is true and 'R' is false
'A' is false and 'R' is true
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72. Name the plant hormone responsible for falling of senescent leaves. (NTSE Chandigarh, Stage-I, 2016-17)
Gibberelin
Auxin
Cytokinin
Abscisic acid
73. In a neuron, conversion of electrical signal to a chemical signal occurs at/in (NTSE Chandigarh, Stage-I, 2016-17)
Axon
Dendrite end
Axonal end
Cell body
74. Geetha is unable to walk in a straight line. Which part of the brain is affected? (NTSE Tamil Nadu, Stage-I, 2016-17)
Cerebrum
Cerebellum
Medulla oblongata
Hypothalamus
75. Thyroxin regulates which of the following metabolisms in the body? (NTSE Chandigarh, Stage-I, 2015-16)
Carbohydrate metabolism only
Protein metabolism only
Fat metabolism only
Carbohydrate, protein and fat metabolism
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