2. Which pancreatic enzyme is effective in digesting proteins?
3. Which enzyme is present in saliva breaks down starch?
4. Name the organelle in which photosynthesis occurs.
5. Differentiate autotrophs and heterotrophs.
Ans.The organism which prepare their own food are called autotrophs for eg: green plants . The organisms which depend on the food prepared by other organisms are called heterotrophs for eg: animals
6. Differentiate between Holozoic nutrition and saprophytic nutrition.
In this nutrition organisms derive their food by consuming complex organic materials by the process of ingestion and then converting the complex molecules into simpler ones to obtain nutrients. Eg. animals and human beings.
In this type of nutrition organism derive their food from the dead and decaying materials. Eg.fungi
7. (a) How is fat digested in our body? ( b) Where does this takes place?
Ans. (a) fats are emulsified by bile salts. The emulsified fats are acted upon by pancreatic and intestinal lipase to form fatty acids and glycerol.
( b)digestion of fats occurs in small intestine.
8. What is the function of epiglottis in man?
Ans: Epiglottis is a triangular shaped flap of cartilage present at the glottis. It prevents the food from entering the windpipe while swallowing
9. When we breathe out, why does the air passage not collapse ? 2014
Ans: Trachea does not collapse because there are rings of muscles around our trachea and are called cartilage which prevents it from collapsing.
10. Herbivores have longer small intestine while carnivores have shorter small intestine. Give reason. 2014
Ans: Herbivores eats grass which contains a lot of cellulose and to digest this cellulose small intestine is longer in them whereas in case of carnivores small intestine is shorter because they eat meat which can be digested easily.
11. Plants absorb water from the soil. Explain how does the water reach the tree top? 2014
Ans: The solution of mineral and water that move from root to leaves is called Sap. The two forces push and pull help to pump up the sap. The absorption of water by root produces a push. Force of pull is produced by transpiration in which plant loose water through the stomata in leaves