Which of the following statements is correct about receptors?
  • Gustatory receptors detect taste while olfactory receptors detect smell
  • Both gustatory and olfactory receptors detect smell
  • Auditory receptors detect smell and olfactory receptors detect taste
  • Olfactory receptors detect taste and gustatory receptors smell
Electrical impulse travels in a neuron from
  • Dendrite axon → axonal end → cell body
  • Cell body → dendrite → axon → axonal end
  • Dendrite → cell body → axon → axonal end
  • Axonal end → axon → cell body → dendrite
In a synapse, chemical signal is transmitted from
  • dendritic end of one neuron to axonal end of another neuron
  • axon to cell body of the same neuron
  • cell body to axonal end of the same neuron
  • axonal end of one neuron to dendritic end of another neuron
In a neuron, conversion of electrical signal to a chemical signal occurs at/in
  • cell body
  • axonal end
  • dendritic end
  • axon
Which is the correct sequence of the components of a reflex arc?
  • Receptors → Muscles → Sensory neuron → Motor neuron → Spinal cord
  • Receptors → Motor neuron → Spinal cord → Sensory neuron → Muscle
  • Receptors → Spinal cord → Sensory neuron → Motor neuron → Muscle
  • Receptors → Sensory neuron → Spinal cord → Motor neuron → Muscle
Which of the following statements are true?
  • (i) and (ii)
  • (i) and (iii)
  • (i) and (iv)
  • (i), (ii) and (iii)
Which of the following statements are true about the brain?
(i) The main thinking part of the brain is hind brain. (ii) Centres of hearing, smell, memory, sight, etc. are located in fore brain. (iii) Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the hind brain. (iv) Cerebellum does not control posture and balance of the body.
  • (i) and (ii)
  • (i), (ii) and (iii)
  • (ii) and (iii)
  • (iii) and (iv)
Posture and balance of the body is controlled by
  • cerebrum
  • cerebellum
  • medulla
  • pons
Spinal cord originates from
  • cerebrum
  • medulla
  • pons
  • cerebellum
The movement of shoot towards light is
  • geotropism
  • hydrotropism
  • chemotropism
  • phototropism
The main function of abscisic acid in plants is to
  • increase the length of cells
  • promote cell division
  • inhibit growth
  • promote growth of stem
Which of the following is not associated with growth of plant?
  • Auxin
  • Gibberellins
  • Cytokinins
  • Abscisic acid
Iodine is necessary for the synthesis of which hormone?
  • Adrenaline
  • Thyroxin
  • Auxin
  • Insulin
Choose the incorrect statement about insulin
  • Adrenaline : Pituitary gland
  • Testosterone : Testes
  • Estrogen : Ovary
  • Thyroxin : Thyroid gland
The shape of guard cells changes due to change in the
  • effect of light
  • effect of gravity
  • rapid cell divisions in tendrillar cells that are away from the support
  • rapid cell divisions in tendrillar cells in contact with the support
The growth of pollen tubes towards ovules is due to
  • hydrotropism
  • chemotropism
  • geotropism
  • phototropism
The movement of sunflower in accordance with the path of Sun is due to
  • phototropism
  • geotropism
  • chemotropism
  • hydrotropism
The substance that triggers the fall of mature leaves and fruits from plants is due to
  • auxin
  • gibberellin
  • abscisic acid
  • cytokinin
Which of the following statements about transmission of nerve impulse is incorrect?
  • Nerve impulse travels from dendritic end towards axonal end.
  • At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron.
  • The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron.
  • A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.
Involuntary actions in the body are controlled by
  • medulla in fore brain
  • medulla in mid brain
  • medulla in hind brain
  • medulla in spinal cord
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