| DIFFERENCE | PROKARYOTES | EUKARYOTES |
| 1) CELL TYPE | They are composed of prokaryotic cells. | They are composed of eukaryotic cells. |
| 2) NUCLEUS | Nucleus is absent in them. | They have well defined nucleus. |
| 3) DNA | DNA is without any nuclear membrane covering and is directly submerged in cytoplasm. | DNA is enclosed inside the nucleus. |
| 4) MEMBRANE-BOUNDED STRUCTURES | Membrane-bounded structures are absent. | Membrane-bounded structures are present. |
| 5) RIBOSOMES | They have small sized 70S ribosomes. | They have large sized 80S ribosomes. |
| 6) CELL WALL | Their cell wall is composed of polysaccharide chain covalently bonded with shorter chains of amino acids forming peptidoglycan or murein. | Cell wall of plants is generally composed of cellulose. |
| 7) CELL DIVISION | They reproduce by binary fission. | They reproduce by mitosis and meiosis. |
| 8) EXAMPLES | Bacteria and blue green algae. | Multicellular animals and plants are examples. |
Chapter#1 Question # 1:How does a person spend his time in old age after retirement? Answer : After retirement when a person becomes old, he has nothing to do. His time seems to pass like lazy cattle moving across a landscape(valley). Question # 2:Why did Chips keep on adjusting his timetable according to the school bells even after the retirement? Answer : After spending more than forty three(43) years at Brookfield, it was not possible for Chips to break his ties with school. He began to live across the road and Mrs. Wickets. That's why it was possible for Chips to keep on adjusting his timetable according to the school bells. Question # 3:How did Chips voice sound in old age? Answer : Although Chips had become old yet he did not loose the zeal and zeast for the life. So his voice remained resonant and lively even in his old age. Question # 4:What did Chips do before going to the bed? Answer : Chips was spending a pleasant and placid time at Mrs. Wickets after his retirem...
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