6) Infants (small babies) of humans and many other animals,(such as cows, dogs, etc.) 4) Bees and hummingbirds also suck the nectar from flowers in plants. These digestive juices convert the complex substances of food into simpler substances which can be absorbed by the body. They eat animals like rats etc. Due to the removal of water, the undigested food becomes semi-solid. This undigested food (or waste material) is stored in the last part of large intestine called rectum for some time. This process is called absorption. The mouth (or buccal cavity) contains teeth, tongue and salivary glands. 5)The food enters the alimentary canal at the mouth (or buccal cavity). The presence of villi gives the inner walls of the small intestine a very large surface area (which helps in the rapid absorption of food). Human beings exhibit a holozoic mode of nutrition involving five basic steps i.e., ingestion, digestion, absorption, assimilation, and egestion. Thus, the role of villi in the small intestine is to increase the surface area for the rapid absorption of digested food. GST As Applicable Extra*. 10) Snakes are flesh eaters. There are some associated glands that secrete enzymes which help in digestion of food. During the process of digestion, the complex starch carbohydrate present in our food is broken down into a simple sugar called glucose. The surface of villi absorbs the digested food materials into blood flowing through them. Every day, we eat food and the body carries out the process of digestion. Digestion: The process by which food is broken down into simple absorbable substances is called Digestion. Class 7 Science. When the food enters oesophagus at the top end, the muscles in the walls of oesophagus start alternate contractions and relaxations producing a wave-like movement which pushes the food downwards towards the stomach. For More Information Talk To Our Sales Executive. It is also called as the alimentary canal. 7) Lice are wingless insects which live on hair. Question 10 What is the action of saliva on food? Question 2 Name the various organs of the human digestive system? 2) It is about 8 to 9 metres long in humans. Your email address will not be published. The digested food is absorbed and utilised by our body. Filed Under: Class 7, Nutrition in Animals, Science Tagged With: absorption, Alimentary Canal, assimilation, bile, buccal cavity, digestion, egestion, gigestive juices, human digestive system, large intestine, liver, mucus, nutrition, oesophagus, pancreas, saliva, salivary glands, small intestine, villi. The walls of small intestine secrete a digestive juice called intestinal juice. 6)The undigested part of food is defecated (thrown out) through the last part of alimentary canal called anus. mouth, by the process of anti-peristalsis in the food pipe. Fatty acids and glycerol build components of cells and form fats to be stored in the body as food reserves. 13) Snails feed on algae by scraping it from rocks. Digestion: The process by which food is broken down into simple absorbable substances is called Digestion. The teeth cut the food into small pieces, chew and grind it. The female mosquitoes also suck blood from other animals (including human beings). Though small intestine is very long it is called small intestine because it is quite narrow tube. The process in which the food containing large, insoluble substances is broken down into small, water soluble substances which can be absorbed by our body, is called digestion. The food is churned in the stomach for about three hours. The butterfly uses its long feeding tube to suck nectar from flowers. The tongue helps in mixing saliva with food. Digestion in humans. 9) Ants feed on plant material and other animals by biting and chewing. Question 15 Define the term assimilation? Chemical Digestion. There are some associated glands that secrete enzymes which help in digestion of food. The salivary glands secrete a watery liquid called, Oesophagus is commonly known as food pipe. The large intestine is about 1.5.metres long. Question 13 What are vili? Question 8 What is the role of hydrochloric acid in stomach? Each villus has a network of thin and small blood vessels (called blood capillaries) close to its surface. The small intestine is arranged in the form of a coil in our belly . These digestive juices convert the complex substances of food into simpler substances which can be absorbed by the body. We provide the best online tuition classes for Class 10 and other classes that comprise Animated Video lectures and Live Interactive Classes that will help students to grasp concepts easily.

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