At Bodhiclasses, we go beyond textbooks to offer thoughtfully crafted questions and answers that deepen understanding, boost confidence, and prepare students for exams and real-life application. In this post, you’ll find a complete set of additional questions from Chapter 9: Life Processes in Animals, tailored to reinforce learning through concept clarity and critical thinking.
Multiple Choice Questions (MCQs): Life Processes
Choose the correct option.
- Which part of the digestive system absorbs most nutrients?
(a) Stomach (b) Small intestine (c) Large intestine (d) Liver
✅ Answer: (b) Small intestine - Which enzyme is present in saliva?
(a) Pepsin (b) Trypsin (c) Amylase (d) Lipase
✅ Answer: (c) Amylase - What is the function of bile?
(a) Digests proteins (b) Neutralizes acid (c) Absorbs glucose (d) Kills bacteria
✅ Answer: (b) Neutralizes acid - Ruminants bring back food to the mouth for:
(a) Storage (b) Swallowing (c) Regurgitation and chewing (d) Digestion
✅ Answer: (c) Regurgitation and chewing - The diaphragm moves down when:
(a) We sleep (b) We breathe in (c) We breathe out (d) We talk
✅ Answer: (b) We breathe in - Exchange of gases in humans occurs in:
(a) Bronchi (b) Larynx (c) Alveoli (d) Trachea
✅ Answer: (c) Alveoli - The final undigested waste is stored in:
(a) Stomach (b) Small intestine (c) Rectum (d) Liver
✅ Answer: (c) Rectum - Which of the following animals breathes through skin?
(a) Fish (b) Frog (c) Cow (d) Bird
✅ Answer: (b) Frog - The finger-like projections in small intestine are called:
(a) Cilia (b) Glands (c) Villi (d) Bronchi
✅ Answer: (c) Villi - Birds grind food in:
(a) Crop (b) Gizzard (c) Liver (d) Mouth
✅ Answer: (b) Gizzard
One Mark Questions: Life Processes
Answer in one sentence.
- What is the function of mucus in the stomach?
✅ It protects the stomach lining from acid. - Name the end product of carbohydrate digestion.
✅ Glucose (simple sugar) - What is egestion?
✅ The removal of undigested waste through the anus. - Name the process by which food is moved through the alimentary canal.
✅ Peristalsis - What is the primary role of alveoli?
✅ Gas exchange between air and blood. - Which organ secretes bile?
✅ Liver - What is rumination?
✅ The process of re-chewing partially digested food in ruminants. - Name the respiratory organ in fish.
✅ Gills - Which part of the digestive system is longest?
✅ Small intestine - What does lime water test detect in exhaled air?
✅ Carbon dioxide
Two Mark Questions: Life Processes
- What is the function of villi in the small intestine?
✅ Villi increase the surface area for absorption of digested nutrients into the blood. - Distinguish between mechanical and chemical digestion.
✅ Mechanical digestion involves physical breakdown (chewing), while chemical digestion involves enzyme activity breaking food into simpler molecules. - Why do we sneeze when exposed to dust?
✅ Dust particles irritate the nasal lining, triggering sneezing to expel them and protect the lungs. - What is the difference between inhaled and exhaled air?
✅ Inhaled air has more oxygen and less CO₂; exhaled air has more CO₂ and less oxygen. - How does the stomach aid in digestion?
✅ It secretes digestive juices and churns food, breaking down proteins. - Why is breathing through the nose better than the mouth?
✅ The nose filters dust through hairs and mucus before air enters the lungs. - Explain the role of the diaphragm during inhalation and exhalation.
✅ It contracts and moves down during inhalation, and relaxes upward during exhalation. - What is the role of pancreas in digestion?
✅ The pancreas secretes enzymes that digest carbohydrates, proteins, and fats. - What happens to food in the large intestine?
✅ Water and salts are absorbed, and the remaining waste is formed into stool. - How do birds digest food without teeth?
✅ Birds use a gizzard, a muscular organ that grinds food with the help of small stones.
Higher Order Thinking Skills (HOTS)
- Why do you think ruminants need a four-chambered stomach while humans do not?
✅ Ruminants eat fibrous plant material (grass) which is hard to digest, so multiple stomach chambers help break it down effectively through microbial fermentation and rumination. - If a person’s villi were damaged, how would it affect their health?
✅ Nutrient absorption would be reduced, leading to malnutrition, weakness, and possible vitamin deficiencies. - How is the structure of alveoli adapted for efficient gas exchange?
✅ Alveoli have thin walls, a large surface area, and are surrounded by capillaries, allowing rapid oxygen and CO₂ exchange. - A person chews food quickly without enough time—how can this affect digestion?
✅ Insufficient chewing leads to poor mechanical digestion and reduced salivary enzyme activity, causing indigestion. - How can practices like pranayama improve respiratory health?
✅ Pranayama strengthens the lungs, improves oxygen intake, calms the nervous system, and increases lung capacity.
