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Question
Assertion :Sparrows possess poor night vision. Reason: Sparrows eyes are made up of ommatidia.
Assertion :Sparrows possess poor night vision. Reason: Sparrows eyes are made up of ommatidia.
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Solution
The correct option is C Assertion is correct but Reason is incorrect
The light-sensitive inner layer of eyeball called retina contains photoreceptors viz rod and cone cells which convert the energy of a specific wavelength of light into action potentials of nerve fibres. Cone cells are sensitive to bright light only. So , they help to see in daylight or in a brightly illuminated room by electric lamps. Rod cells are sensitive even to dim light and consequently help to see in dim light and at night. Animals like sparrows, which are active only in the daytime, have mostly cone cells in their retina and therefore they possess poor night vision. Ommatidia are the elongated tube-like units of a compound eye present in higher invertebrates like prawns crabs and insects Ommatidia have crowed over a spherical surface. Each focusses the light from a small area of the object so that a mosaic of a large number of image of the adjacent areas of the objects are formed by numerous ommatidia. A fusion of these images may produce a composite blurred image of the objects.So the correct option is 'C'.
The light-sensitive inner layer of eyeball called retina contains photoreceptors viz rod and cone cells which convert the energy of a specific wavelength of light into action potentials of nerve fibres. Cone cells are sensitive to bright light only. So , they help to see in daylight or in a brightly illuminated room by electric lamps. Rod cells are sensitive even to dim light and consequently help to see in dim light and at night. Animals like sparrows, which are active only in the daytime, have mostly cone cells in their retina and therefore they possess poor night vision. Ommatidia are the elongated tube-like units of a compound eye present in higher invertebrates like prawns crabs and insects Ommatidia have crowed over a spherical surface. Each focusses the light from a small area of the object so that a mosaic of a large number of image of the adjacent areas of the objects are formed by numerous ommatidia. A fusion of these images may produce a composite blurred image of the objects.
So the correct option is 'C'.
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