In a neuron the concentration of intracellular potassium and extracellular sodium is in a

ratio of

1. 1:1

2. 30:1

3. 10:1

4. 3:1

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Pick the odd-one out.

1. Nervous tissue : node of Ranvier

2. Ear: aqueduct of Sylvius

3. Bone : Volkman's canal

4. Eye: canal of Schlemm

Subtopic:  Meninges, Ventricles & CSF |
 54%
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Though sensitive to entire visible spectrum, the cones in the human eye show maximunm

sensitivity to

1. blue colour

2. green colour

3. red colour

4. all of these.

Subtopic:  Human Eye: Adaptation (OLD NCERT) |
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Unipolar neurons are found only in

1. early embryos

2. olfactory epithelium

3. retina of the eye

4. spinal cord

Subtopic:  Nervous System |
 86%
From NCERT
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To view explanation, please take trial in the course.
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Which of the following types of cells are found in retina ?

1. Neuroglial cell 

3. Schwann cell 

4. Amacrine cell

5. Purkinje cell

Subtopic:  Basic Anatomy of Human Eye: 1 (OLD NCERT) | Basic Anatomy of Human Eye (OLD NCERT) |
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Which of the following minerals reduces the excitability of nerves and muscles?

1. Potassium

2. Sodium

3. Magnesium

4. Manganese

Subtopic:  Action Potential |
 53%
From NCERT
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To view explanation, please take trial in the course.
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Which of the following is a psychosomatic disorder?

1. Psychosis

2. Neurosis

3. Hypochondria

4. Schizophrenia

Subtopic:  Hind & Mid Brain | Diencephalon |
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A frog has its brain crushed. But when pinched on the leg. The leg draws away. It is an

example of

1. neurotransmitter induced responsce

2. simple reflex

3. conditioned reflex

4. automated motor response.

Subtopic:  Motor Functions of Spinal Cord |
AIIMS - 2001
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Which of the following pesticides is an acetylcholinesterase inhibitor?

1. Aldrin

2. BHC

3. Endosulfan

4. Malathion

Subtopic:  Synapse |
AIIMS - 2001
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Identify the correct statement

1. In amniotes last nerve is spinal accessory.

2. In non-amniotes last nerve is vagus.

3. Optic is shortest nerve.

4. Olfactory nerves has mixed fibres.

AIIMS - 2001
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