Case-Based Questions – Life Processes (Class 10 CBSE) with Detailed Solutions

Case-Based Questions – Life Processes (Class 10 CBSE) with Detailed Solutions

Case-Based Questions Case-Based Questions class 10 cbse SirBikramSutradhar bAstronautWay

Case-based questions are designed to test conceptual understanding and application of knowledge in real-life scenarios. Here are 10 case-based questions covering nutrition, respiration, circulation, excretion, and transport in plants.

Case 1: Nutrition and Digestive System

Q1. A doctor advises a patient to reduce fatty food intake and increase fiber in the diet. The patient also reports experiencing indigestion and bloating.

Based on this, answer the following questions:

1. Which digestive enzyme is responsible for breaking down fats?
   
   
2. How does fiber help in digestion?
   
   
3. If the patient has insufficient bile secretion, how would fat digestion be affected?
   
   

Solution:

1. Lipase is the enzyme that breaks down fats into fatty acids and glycerol.
   
   
2. Fiber adds bulk to food, promotes peristalsis (smooth movement of food in intestines), and prevents constipation. It also helps maintain gut health.
   
   
3. Bile emulsifies fats (breaks them into smaller droplets for better enzyme action). If bile secretion is low, fat digestion slows down, leading to bloating and indigestion.
   
   

Case 2: Cellular Respiration and Exercise

Q2. During a 400m sprint, an athlete experiences muscle cramps and fatigue. The coach explains that it is due to lactic acid accumulation.

Answer the following questions:

1. What type of respiration takes place during a sprint?
   
   
2. How does lactic acid cause muscle cramps?
   
   
3. Why does an athlete breathe heavily after a sprint?
   

Solution:

1. Anaerobic respiration occurs because muscles do not receive enough oxygen.
   
   
2. Lactic acid lowers the pH of muscle cells, leading to cramps and pain.
   
   
3. Heavy breathing after a sprint helps the body take in more oxygen, convert lactic acid back to pyruvate, and relieve cramps.
   
   

Case 3: Circulatory System and Heart Disease

Q3. A 55-year-old man was diagnosed with high blood pressure and blocked coronary arteries. The doctor suggested lifestyle changes and prescribed blood-thinning medicines.

Answer the following questions:

1. Why are blocked coronary arteries dangerous?
   
   
2. How do blood-thinning medicines help in such conditions?
   
   
3. Why do people with high blood pressure have a higher risk of heart disease?
   
   

Solution:

1. Coronary arteries supply oxygen-rich blood to the heart. A blockage can lead to angina (chest pain) or heart attack.
   
   
2. Blood thinners prevent clot formation, reducing the risk of heart attack.
   
   
3. High blood pressure exerts extra force on blood vessels, increasing the chances of artery damage and heart failure.
   
   

Case 4: Excretory System and Kidney Failure

Q4. A patient’s blood report shows high levels of urea and creatinine. The doctor recommends dialysis.

Answer the following questions:

1. What does high urea and creatinine indicate?
   
   
2. How does dialysis help kidney failure patients?
   
   
3. What is the role of nephrons in excretion?
   
   

Solution:

1. High urea and creatinine indicate kidney failure, as kidneys are unable to filter out waste properly.
   
   
2. Dialysis removes waste, excess salts, and water from the blood artificially, mimicking kidney function.
   
   
3. Nephrons filter blood, reabsorb nutrients, and excrete waste as urine.
   

Case 5:

Transport in Plants

Q5. A gardener notices that when a plant is overwatered, its leaves turn yellow and eventually fall off.

Answer the following questions:

1. Why do leaves turn yellow when plants are overwatered?
   
   
2. How does overwatering affect the roots?
   
   
3. What role do stomata play in transpiration?
   
   

Solution:

1. Overwatering reduces oxygen supply to roots, affecting chlorophyll production, which causes yellowing of leaves (chlorosis).
   
   
2. Roots suffocate in waterlogged soil, leading to poor nutrient absorption and weak plant growth.
   
   
3. Stomata regulate transpiration, allowing controlled water loss and gas exchange.
   
   

Case 6: Photosynthesis and Environment

Q6. A scientist grows two identical plants—one in a room with normal air and the other in a room with increased carbon dioxide levels. The second plant grows faster.

Answer the following questions:

1. Why did the plant in high CO₂ conditions grow faster?
   
   
2. What are the necessary conditions for photosynthesis?
   
   
3. How do stomata help in photosynthesis?
   
   

Solution:

1. Higher CO₂ increases the rate of photosynthesis, leading to faster plant growth.
   
   
2. Photosynthesis requires sunlight, CO₂, water, and chlorophyll.
   
   
3. Stomata allow CO₂ entry and release oxygen, essential for photosynthesis.
   
   

Case 7: Role of Hemoglobin in Blood

Q7. A patient with anemia complains of dizziness and extreme fatigue. A blood test shows a low hemoglobin count.

Answer the following questions:

1. What is the function of hemoglobin in the blood?
   
   
2. Why do anemic patients feel fatigued?
   
   
3. How can anemia be treated?
   
   

Solution:

1. Hemoglobin binds with oxygen and transports it to body cells.
   
   
2. Low hemoglobin means less oxygen reaches cells, leading to fatigue and weakness.
   
   
3. Iron-rich foods (like spinach, meat) or iron supplements help increase hemoglobin levels.
   
   

Case 8: Smoking and Lung Diseases

Q8. A person who has been smoking for 15 years develops breathlessness and chronic cough. A doctor diagnoses him with emphysema.

Answer the following questions:

1. How does smoking cause emphysema?
   
   
2. What happens to alveoli in emphysema?
   
   
3. Why do smokers cough frequently?
   
   

Solution:

1. Smoking damages lung tissues, reducing elasticity and leading to breathlessness.
   
   
2. Alveoli lose their structure, reducing the surface area for gas exchange.
   
   
3. Smoking triggers excess mucus production, causing irritation and cough.
   
   

Case 9: Artificial Pacemaker and Heart Functioning

Q9. A 70-year-old man suffers from irregular heartbeats. Doctors suggest implanting an artificial pacemaker.

Answer the following questions:

1. What is the function of the pacemaker in the heart?
   
   
2. Why is an artificial pacemaker used?
   
   
3. How does the heart generate electrical impulses naturally?
   
   

Solution:

1. The natural pacemaker (SA node) generates electrical impulses to maintain a regular heartbeat.
   
   
2. An artificial pacemaker helps regulate heartbeats in patients with weak electrical activity.
   
   
3. The SA node and AV node generate impulses, which are transmitted through Purkinje fibers.
   
   

Case 10: Water Loss and Transpiration in Plants

Q10. A plant in a greenhouse is kept under a fan, and its leaves dry out faster than usual.

Answer the following questions:

1. Why does air movement increase transpiration?
   
   
2. How do plants prevent excessive water loss?
   
   
3. What role does xylem play in water transport?
   
   

Solution:

1. Wind removes moisture around stomata, increasing transpiration.
   
   
2. Plants close stomata and reduce leaf size to minimize water loss.
   
   
3. Xylem transports water from roots to leaves using capillary action and transpiration pull.
   
   

Written By

Full Stack Developer and 5-Time World Record Holder, Grandmaster Bikram Sutradhar

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