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Difference between rods and cones -
Rods
Cones
1. More in number 1150 lakh
2. Outer seg. is cylindrical and contains rodopisin
3. Rods are alike
4. Concerned with night blindness
5. Sensitive to dim light
Less in number 65 lakh
Outer segment is conical & contain iodopsin
Cones are of 3 types
Colour blindness
Sensitive to sharp light
difference between anaerobic respiration and fermentation
natural selection
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Classification of Viruses No evolutionary or phylogenetic exist between viruses. A nature system of classification cannot, therefore, be devised for viruses. Holmes (1948)
mendal laws
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