Life Processes Note Class 6

Life Processes

A. Very Short Questions.

1. What are life processes?
   The fundamental activities that living organisms carry out to grow, reproduce and maintain their existence are called life processes.
2. What is nutrition?
   Nutrition is the process by which living organisms take in food and use it for energy, growth, and repair.
3. What is photosynthesis?
   Photosynthesis is the process by which green plants make their own food using sunlight, carbon dioxide, and water.
4. How do autotrophic organisms obtain their food?
   Autotrophic organisms obtain their own food using sunlight through photosynthesis.
5. What is the main pigment responsible for trapping sunlight during photosynthesis?
   Chlorophyll is the main pigment responsible for trapping sunlight during photosynthesis.
6. What are the three essential factors needed for photosynthesis to occur?
   Sunlight, water, and carbon dioxide are the three essential factors needed for photosynthesis to occur.
7. Where does photosynthesis mainly occur in plants?
   Photosynthesis mainly occurs in the leaves in plants.
8. What are saprophytes?
   Saprophytes are organisms that get their food from dead organic matter.
9. What are parasites?
   Parasites are organisms that live on or inside another organism (host) and get food from it.
10. What are holozoic organisms?
    The organisms that feed on the whole body of plants or animals or both are called holozoic organisms.
11. What is the process of breaking down food into simpler substances called?
    The process of breaking down food into simpler substances is called digestion.
12. What is the function of saliva in the digestive system?
    The function of saliva in the digestive system is to moistens the food and begins the digestion of starch.
13. What is the function of the stomach in the digestive system?
    The function of the stomach in the digestive system is to break down food using digestive juices.
14. What happens to the undigested food in the human stomach?
    The undigested food in the human stomach passes to the small intestine for further digestion.
15. What is the function of the pancreas in the digestive system?
    The function of pancreas in the digestive system is to produce digestive enzymes for digestion and insulin to regulate blood sugar.

B. Short Questions.

1. Provide two examples of life processes.
   The two examples of life processes are digestion and respiration.
2. Name the two main types of nutrition found in organisms.
   The two main types of nutrition found in organisms are autotrophic nutrition and heterotrophic nutrition.
3. Write the importance of photosynthesis.
   Photosynthesis is important because it provides food for plants and animals and releases oxygen into the atmosphere, which is essential for life.
4. Define autotrophic nutrition and provide an example.
   The mode of nutrition in which an organism prepares its own food is called autotrophic nutrition. For example: Green plants prepare food by photosynthesis.
5. What is heterotrophic nutrition? Give an example.
   The mode of nutrition in which an organism takes food from another organism is called heterotrophic nutrition. For example: Tiger feeds on a deer.
6. Name the three main parts of the alimentary canal.
   The three main parts of the alimentary canal are mouth, stomach and small intestine.
7. What are digestive glands? Give two examples.
   Digestive glands are glands that produce digestive juices to help in breaking down food. For example: pancreas and salivary glands.
8. Explain the process of digestion in the mouth.
   Food enters the mouth, where it is chewed by the teeth and mixed with saliva. Saliva contains enzymes that begin the breakdown of carbohydrates.
9. Write down the role of following enzymes in digestion of food.
   a) Lipase: It breaks down fats into fatty acids and glycerol.
   b) Amylase: It breaks down starch into simple sugars.
10. Name the three parts of the small intestine.
    The parts of the small intestine are duodenum, jejunum and ileum.
11. What happens to undigested food in the large intestine?
    Undigested food enters the large intestine where water and electrolyte are absorbed from it, forming solid waste called feces.
12. How are nutrients absorbed in the small intestine?
    Nutrients are absorbed through tiny finger-like structures called villi in the small intestine. These help nutrients pass into the bloodstream.
13. Name any three organs of the alimentary canal.
    The three organs of the alimentary canal are mouth, stomach and small intestine.
14. What is the purpose of human digestive system.
    The purpose of human digestive system is to break down food into simple substances and helps the body absorb nutrients for energy, growth, and repair.
15. Differentiate between autotrophic and heterotrophic mode of nutrition.

    Autotrophic mode of nutrition	Heterotrophic mode of nutrition
    i) The mode of nutrition in which an organism prepares its own food is called autotrophic nutrition.	i) The mode of nutrition in which an organism takes food from another organism is called heterotrophic nutrition.
    ii) For example: Green plants prepare food by photosynthesis.	ii) For example: Tiger feeding on deer.

C. Long Questions.

1. Draw the diagram of human digestive system and also labeled it.

Figure: Human Digestive System

2. Write the down the mode of nutrition of the following organisms.
a. Mosquito: Parasitic mode
b. Mushroom: Saprophytic mode
c. Eagle: Holozoic mode
d. Tapeworm: Parasitic mode
e. Mucor: Saprophytic mode
f. Frog: Holozoic mode

3. Name the process shown in the given figure.
The process shown in the given figure is photosynthesis.