Assertion : Astigmatism is due to uneven curvature of lens.
Reason : It is treated with cylindrical lenses.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
B.
If both assertion and reason are true but reason is not the correct explanation of assertion
Astigmatism is a defect of vision in which the image of an object is distorted. It is either in the vertical or the horizontal axis, because not all the light rays come of a focus on the retina. Some parts of the object may be in focus but light from other parts may be focused in front of or behind the retina. This is usually due to abnormal curvature of the cornea and/ or lens whose surface resembles part of sphere. The defect can be corrected by wearing cylindrical lenses, called toric contact lens which produce exactly the opposite degree of distortion and thus cancel out the distortion caused by the eye itself.
Which match is true?
| Vitamin deficiency disease | Vitamin | Source |
| Severe bleeding | Tocopherol | Milk, egg |
| Anaemia | Ascorbic acid | Lemon, orange |
| Night blindness | Retinol | Carrot, milk |
| Sterility | Calciferol | Milk, butter |
The black pigment in the eye which reduces the internal reflection is located in
retina
iris
cornea
sclerotic
Assertion : Connective tissue inside the brain is essential for conduction of nerve impulse.
Reason : Connective tissue hold together the nerve cells of brain.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion: Rhabdome is present in Palaemon.
Reason: Rhabdome has an important role in digestion
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Injury to vagus nerve in humans is not likely to affect
tongue movements
gastrointestinal movements
pancreatic secretion
cardiac movements.
One common example of simple reflex is
tying your shoe laces while talking to another person and not looking at them
watering of mouth at the sight of a favourite food
climbing up a stairs in dark without stumbling
closing of eyes when strong light is flashed across them.
Assertion: Organ of Corti rests on tectorial membrane.
Reason: It helps to maintain equilibrium of body
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
