Question
How is natural system different from artificial system of classification? List some features.
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S. No.
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Natural System
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Artificial System
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(i)
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It is based on large number of characters.
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It is based on only one or a few characters.
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(ii)
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The characters are stable.
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The characters are liable to change with change in environment.
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(iii)
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It avoids analogy.
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It accepts analogy for grouping.
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(iv)
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It is based on morphology, anatomy, cytology, embryology, molecular biology and genetics.
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It is based on morphological or anatomy, cytology, embryology, reproductive traits.
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(v)
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Natural system brings out homology.
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Artificial system does not study homology.
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| Enzyme | Site of Action | Substrate | Product of Action |
| Salivary amylase | Mouth and stomach | A | Maltose |
| B | Stomach | Proteins | Proteoses and peptones |
| Trypsin | C | Proteins peptones and propteoses | Dipeptides |
| Lipase | Small intestine | Fats | D |
| E | Small intestine | Nucleic acid | Nucleotides and nucleosides |
| Lactase | Small intestine | F | Glucose and galactose |