Digestion in Mouth Stomach Small Intestine_Unsolved Paper
Chapter: Life Processes | Topic: Digestion in Mouth Stomach Small Intestine
DIGESTION IN MOUTH STOMACH SMALL INTESTINE_UNSOLVED PAPER
Topic: Digestion in Mouth Stomach Small Intestine
Q1.Which enzyme present in saliva begins the digestion of carbohydrates?
- Pepsin
- Salivary amylase
- Trypsin
- Lipase
Q2. The muscular movements that push food through the oesophagus are called:
- Diffusion
- Peristalsis
- Absorption
- Respiration
Q3. Which digestive juice is secreted by the stomach?
- Bile juice
- Pancreatic juice
- Gastric juice
- Saliva
Q4. Most of the digestion and absorption of food takes place in the:
- Mouth
- Stomach
- Small intestine
- Large intestine
Q5. A student carefully chews food before swallowing. Which digestive process is improved because of this habit?
- Filtration
- Mechanical digestion
- Excretion
- Respiration
Q6. Which structure in the small intestine increases the surface area for absorption?
- Alveoli
- Nephrons
- Villi
- Cartilage
Short questions
Q1. Explain the role of saliva in the digestion of food inside the mouth.
Q2. State any two functions of hydrochloric acid present in the stomach.
Q3. Why is the small intestine considered the main site for digestion and absorption?
Q4. A student eats food in a hurry without chewing properly during lunch break. Explain how this may affect digestion in the mouth and stomach.
Q5. Differentiate between digestion in the mouth and digestion in the stomach on the basis of enzymes and food components digested.
Q6. Describe the role of bile and pancreatic juice in the digestion process taking place in the small intestine.
Q1. Describe the complete process of digestion beginning from the mouth and ending in the small intestine. Mention the role of important digestive juices and enzymes involved at each stage.
Q2.A healthy meal contains rice, dal, vegetables, curd, and a small amount of cooking oil. Explain how different nutrients present in this meal are digested in the mouth, stomach, and small intestine.
Q3. A school organises a health awareness programme encouraging students to eat slowly and chew food properly. Explain scientifically why these habits are important for efficient digestion.
Q1. Read the following case:
Aman frequently skips breakfast and later eats a large quantity of spicy snacks after school. He often experiences stomach discomfort.
Based on your understanding of digestion:
Identify the digestive organs mainly involved.
Explain how their normal functions may be affected by these eating habits.
Suggest how proper eating habits support healthy digestion.
Q2. A science teacher prepared the following flow chart:
Food → Mouth → Stomach → Small Intestine
Prepare a detailed explanation describing the digestive events taking place at each stage of this flow chart. Include the role of enzymes and digestive juices.
Q3. During a biology practical, four students made the following observations:
Student A: Digestion begins in the mouth.
Student B: Proteins are digested in the stomach.
Student C: Most absorption occurs in the small intestine.
Student D: Villi help in absorbing digested nutrients.
Analyse these observations and explain the digestive process related to each statement using your knowledge of the human digestive system.