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81. In females, ovaries secrete hormone (NTSE Maharashtra, Stage-I, 2015-16)
Estrogen
Testosterone
Auxin
Gibberellins
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82. An injury in accident has disturbed regulation of body temperature, water balance and hunger. The part of brain effected is (NTSE Haryana, Stage-I, 2015-16)
Cerebellum
Cerebrum
Medulla oblongata
Hypothalamus
83. Name the hormone that runs our biological clock. (NTSE Odisha, Stage-I, 2015-16)
Oxytocin
Thyroxin
Melatonin
Prolactin
84. Growth of pollen tubes towards ovule for fertilization is due to (NTSE Andhra Pradesh, Stage-I, 2015-16)
Thigmotropism
Phototropism
Chemotropism
Hydrotropism
85. When touched, the leaflets of Touch-me-not plant are closed. Closing of leaflets starts from the point of contact to the leaflets away. The leaflets are closed due to (NTSE Stage-II,2015-16)
Change in turgor pressure
Specialized proteins
Growth hormone retardation
Capillary action
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