Kerala SCERT Class 9 Biology Food Through Digestive Tract Question Answer
Kerala SCERT Class 9 Biology Chapter 2 Food Through Digestive Tract Question Answer Solution Here. Kerala Board Class 9 Students can find Here 2nd Chapter Food Through Digestive Tract Notes provide by our Teacher. Important Question Answer from Chapter 2 Food Through Digestive Tract.
- Board- Kerala Board.
- Class – 9.
- Subject – Biology Part 1
- Chapter – 2
- Chapter Name – Food Through Digestive Tract.
- Topic – Question Answer Solution.
More Notes by Expert Teacher:
1) Explain the structure of molar teeth?
The teeth have four main parts, enamel, dentine, pulp, cementum.
Each have different structure like: –
Enamel: – hardest part and is made up of dead tissue is white in colour
Dentine: – living tissue in tooth
Pulp: – soft connective tissue, blood vessels, lymph duct and nerve fiber are seen
Cementum: – have calcium in connective tissue that holds the tissue in socket
2.) The tongue helps teeth to masticate food materials and mix them with saliva. Which gland releases saliva? Why does food feel sticky when it gets mixed with saliva? Explain the function of secretion of glands
The salivary gland secretes mucus and two enzymes like salivary amylase and salivary lysozymes. The food is sticky because mucus makes the food slimy and makes it easy to swallow. Lysozyme helps to destroy the germs that enter the body through food. Amylase converts starch to maltose.
3.) Case base question
Ansh, while having food was singing songs, his grandparents told him not to as it may get stuck in his windpipe. The same relevance was given by his biology teacher some days before where teacher told him about tongue, uvulas, epiglottis.
1) Explain Ansh the function of all three parts and the importance of not allowing food in windpipe?
2) What is peristalsis?
Ansh grandparents were correct about not talking or saying anything while having food because, the three parts tongue, uvulas, epiglottis help in making food move down to esophagus.
The tongue compresses the food with the help of palate.
The uvula closes the nasal cavity that opens to the pharynx.
The posterior part of the tongue helps to move the food to the esophagus.
Epiglottis helps by closing trachea which rises, stops food from moving into the windpipe.
2) the food reaches the stomach by a wave like movement of the walls of the esophagus. The movement is known as peristalsis.
4.) Explain the changes that take place in stomach with the food?
Peristalsis in the stomach converts food into paste circular muscles in the posterior part of the stomach retain food for a specific period. Gastric juice also helps with digestion.
5.) Different enzymes or acids help in digestion, gastric juice like pepsin convert proteins to peptone.
Lipase enzymes help in digesting fat partially.
Hydrochloric acid regulates pH and destroys germs in food.
Mucus which is released in the stomach is important as it protects the stomach wall from the action of digestive juices.
6.) Case base question
Jay was told in chemistry lab to handle the hydrochloric acid carefully as it burns the skin if comes in contact, on the same side in biology he learned about the gastric juices where he heard about hydrochloric acid helps in digestion on asking the teacher, she explained that some specific cells are placed on the walls which protects the stomach.
1.) What is the pH range of hydrochloric acid in stomach?
2.) What is the function of special cells which are present on the walls of stomach?
3.) What is the health issue related to gastric?
1) The pH of the hydrochloric acid in stomach is 1 to 3.
2) Some cells are specially lined on the walls of stomach walls which secrete mucus and bicarbonate which protect the stomach walls.
3) If the acids are produced more in stomach, it may become a health issue like gastric ulcers.
7.) How is the small intestine so long present in our body? What are the names of small intestines?
The small intestine is five to six meters long, it is present in the form of folds and coils. The three parts of the small intestine are duodenum, ileum, jejunum.
8.) What is the function of villi? Where are they present?
Villi are small fingers like projection on the walls of the intestine. The function is to increase the surface area of absorption of nutrients. Absorption of nutrients and 90% of water absorption takes place through villi.
9.) What are lacteal? What are the biomolecules absorbed through lacteal? What type of movement does it take place in lacteal?
Lacteals are lymphatic capillary present on the villi, fatty acid and glycerol are absorbed. The absorption of fatty acid and glycerol takes place by simple diffusion.
10.) What type of diffusion helps the transport of glucose, fructose, galactose?
Facilitated diffusion helps in the transport of glucose, fructose, galactose.
11.) Define active transport. Explain where it is applicable?
Active transport takes place with the help of carrier protein and use energy for the transport. It takes place from lower concentration to higher concentration. When glucose and salt concentration decrease in the small intestine, absorption takes place by active transport.
12.) What is the importance of large intestines?
A major part of the salt and water left after the absorption in the small intestine are absorbed in the large intestine. Certain bacteria living in large intestine produce substances like vitamin K. Digestive waste is eliminated through the anus.
13.) What is roughage? What is its importance?
Fiber in cereals and vegetables is an essential component of food called roughage. They do not undergo digestion; they help in the absorption process.
Also See: This Chapter MCQ Question Answer