Q. 274.5( 2 Votes )
Describe the heterotrophic mode of nutrition and give its examples. Name the three types of this nutrition.
The mode of nutrition in which the organism is not able to prepare its food by itself and obtains food from green plants or other animals is known as the heterotrophic mode of nutrition.
Examples of heterotrophic nutrition are the higher animals (human beings). They cannot prepare their own food by themselves and obtains food from green plants and other animals. Other examples are bacteria, lion, cuscuta etc.
Three types of heterotrophic nutrition are:
1. PARASITIC: When the organism lives on other organism and obtain their food from them, it is known as parasitic nutrition and the organism is known as a parasite.
Ex: ticks, lice, leeches etc.
2. SAPROPHYTIC: When the organism feed on the dead and decay of plants and animals, it is known as saprophytic nutrition and the organism is called saprophyte.
Example: bacteria, yeast, mushroom etc.
3. SYMBIOTIC: When the give and take relation is maintained between two organisms and both the organisms are benefited, it is known as symbiotic.
Example: It is very common in algae and fungi. They live together and are known as lichen.
Rate this question :
Study the given diagram:
Name the parts ‘A’ and ‘B’ and state one function of each.
How are fats digested in our bodies? Where does this process take place?Xam idea - Science
The inner lining of stomach is protected by one of the followings from hydrochloric acid. Choose the correct one:Evergreen Science
When a person puts food in his mouth, then teeth cut it into small pieces, chew and grind it. The glands A in the mouth secrete a substance B which is mixed with the food by tongue. The substance B contains an enzyme C which starts the digestion of food in the mouth. The slightly digested food from the mouth goes down a tube D. The special type of movements E in the walls of tube D push the food into stomach for further digestion. The stomach wall secretes gastric juice containing three substance F, G and H. One of the functions of F is to kill bacteria which may enter the stomach with food. The substance G protects the inside layer of stomach from the damaging effect of substance F whereas substance H is an enzyme for digestion. The partially digested food then enters into small intestine for further digestion.
(a) What is (i) gland A
(ii) substance B, and (iii) enzyme C?
(b) Name the tube D.
(c) What is the movement E known as?
(d) What are (i) F (ii) G, and (iii) H?Lakhmir Singh & Manjit Kaur- Biology