CBSE Class 7 Science Chapter 2 Notes : Nutrition in Animals
Animal nutrition can be defined as the nutrient requirement, the mode of food intake and how it is utilized in the body. The important digestive glands that secrete digestive juice viz liver, pancreas and salivary glands. The digestive system in human consists of secretory glands and alimentary canal. The alimentary canal consists of a buccal cavity, oesophagus, stomach, small intestine, large intestine, and anus. The intake of food is carried out by the mouth. This process is called ingestion. We chew the food to make it into small pieces. The food mixes with saliva and we swallow it. The swallowed food is pushed downward to pass through food pipe and chest. The food reaches the widest part of the alimentary canal i.e the stomach. Its shape is like flattened J with one opening to food pipe and the other opening to the small intestine. The bacteria that enter through food are killed by acids in the stomach. It is later passed on to the small intestine which is 7.5 metres long. Fats are digested by the bile juice secreted by the liver. This bile juice is stored in the gallbladder. The process of absorption takes place in the small intestine. In this process, the digested food is passed through blood vessels in the intestinal wall. The finger-like projections on the inner wall of the small intestine are called villi.
Nutrition In Animals Class 7 Important Questions
- How do we get energy from glucose? Explain.
- Explain the main steps of nutrition in humans.
- Explain the process of digestion in amoeba.
- How is bile produced and where?
- Distinguish between the nutrition of human beings and amoeba.
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