| 1. | Breathing is controlled by which part of the brain ? | |
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Hypothalamus
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Medulla oblongata
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Cerebellum
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Cerebrum
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Report Question| 2. | Fall of mature leaves and fruits from plants is triggered by which of the following substance ? | |
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Gibberellin
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Abscisic acid
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Cytokinin
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Auxin
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| 3. | Roots of plants are ? | |
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positively phototropic
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positively geotropic
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negatively geotropic
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None of these
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| 4. | Reflex actions are mediated through ? | |
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receptors
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spinal cord
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effectors
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brain
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| 5. | Dramatic changes of body features associated with puberty are mainly because of secretion of ? | |
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Testosterone from thyroid gland and Oestrogen from pituitary gland
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Testosterone from testes and Oestrogen from ovary
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Oestrogen from adrenal gland and testosterone from pituitary gland
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Oestrogen from testes and testosterone from ovary
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| 6. | Which of the following statements are true ? | |
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Sudden action in response to something in the environment is called reflex action, and Motor neurons carry signals from receptors to spinal cord.
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Sudden action in response to something in the environment is called reflex action, and The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc.
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Sudden action in response to something in the environment is called reflex action, and Sensory neurons carry signals from spinal cord to muscles, and Motor neurons carry signals from receptors to spinal cord.
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Sudden action in response to something in the environment is called reflex action, and Sensory neurons carry signals from spinal cord to muscles.
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| 7. | The endocrine organ present in human female but not in human male is ? | |
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Thymus
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Pituitary gland
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Ovary
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Testis
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| 8. | Consider the following statements and choose the incorrect one ? | |
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Moving our hand away on touching a hot plate is an example of reflex action.
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The pathway or route taken by nerve impulse in a reflex action is called reflex area.
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The simplest form of response in the nervous system is reflex action.
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All the nerves of the body together make up the peripheral nervous system.
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| 9. | Which of the following endocrine glands is unpaired ? | |
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Ovary
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Pituitary
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Testes
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Adrenal
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| 10. | Which hormone regulates the ionic balance in the body ? | |
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Vasopressin
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Thyroxine
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Testosterone
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Glucagon
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