NCERT Solutions for Class 7 Science Chapter 2
Important NCERT Questions
7th Chapter 2 Nutrition in Animals
NCERT Books for Session 2022-2023
CBSE Board and State Board
Questions No: 10
Write one similarity and one difference between the nutrition in amoeba and human beings.
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Similarity: Both amoeba and human beings acquire nutrients through the process of ingestion. They take in food for nourishment and energy.
Difference:
– Amoeba: Uses phagocytosis, engulfing food via temporary extensions called pseudopodia, then digests it in vacuoles within its single cell.
– Human Beings: Possess a complex digestive system involving organs like the mouth, stomach, and intestines. Food undergoes mechanical and chemical breakdown, followed by absorption of nutrients in the small intestine, and their distribution to body cells via the bloodstream.
Though both ingest nutrients, the single-celled amoeba uses phagocytosis, while humans rely on a sophisticated digestive system to process and distribute nutrients throughout the body.
• Similarity: The basic process of digestion of food and release of energy is the same in amoeba as well as in human beings. In amoeba, Digestive juices are secreted into the food vacuole. They act on the food and break it down into simpler substances. Gradually the digested food is absorbed. Similarly, in human beings various digestive juices (mouth, stomach, intestine etc.) act on food and break it down to simpler substances.
•Difference: The digestion process in amoeba is simple while in human beings it is a complex process. The process of ingestion and egestion are also quite different. Amoeba engulf its food by surrounding the food particle with its pseudopodia. The undigested food which is largely carbon dioxide gas is expelled outside by the vacuole. While in human beings, the food (which is complex substance) is taken inside the mouth and undergoes a complex process of digestion and absorption. Finally the undigested food it expelled in the form of faeces.
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