Life Processes (Case Study) (10 Science)
CBSE case-based questions on human digestion, respiration, and circulation. Scenarios involve medical conditions, diet analysis, and physiological response
TL;DR: CBSE case-based questions on human digestion, respiration, and circulation. Scenarios involve medical conditions, diet analysis, and physiological res…
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CBSE case-based questions on human digestion, respiration, and circulation. Scenarios involve medical conditions, diet analysis, and physiological response
Life Processes (Case Study) MCQs with Answers & Explanations
Q1. A person has low hemoglobin levels (anemia) and feels fatigued. Which life process is primarily affected and why?
- Digestion, because nutrients cannot be broken down
- Respiration, because oxygen transport is reduced ✓ (correct)
- Excretion, because waste removal is incomplete
- Photosynthesis, because energy production is low
Q2. A vegetarian diet lacks vitamin B12 naturally. Which digestive organ needs to produce an intrinsic factor to enable B12 absorption?
- Small intestine
- Stomach ✓ (correct)
- Pancreas
- Liver
Q3. During intense exercise, a person's breathing rate increases. This is primarily due to increased blood CO2 levels. How does the body sense this change?
- Through taste buds
- Through chemoreceptors in the carotid artery and medulla ✓ (correct)
- Through muscle contraction
- Through light exposure
Q4. A patient receives an injection of epinephrine (adrenaline) which increases heart rate and blood pressure. Which body system coordinates this response?
- Digestive system
- Nervous and endocrine systems ✓ (correct)
- Skeletal system
- Integumentary system
Q5. A person with gallstones may experience pain during fat digestion. Why is the gallbladder important in this process?
- It produces bile
- It stores and concentrates bile for fat emulsification ✓ (correct)
- It breaks down large lipid molecules
- It absorbs vitamins
Q6. A child has a deficiency in amylase enzyme. Which food group would be difficult to digest?
- Proteins
- Carbohydrates ✓ (correct)
- Fats
- Vitamins
Q7. In the lungs, oxygen diffuses from the alveoli into the blood while CO2 diffuses out. This is because of a concentration gradient. What is this process called?
- Active transport
- Diffusion ✓ (correct)
- Osmosis
- Photosynthesis
Q8. A person's resting heart rate is 60 beats per minute. During aerobic exercise, it increases to 130 beats per minute. Which statement is correct?
- More blood flows to muscles
- Oxygen delivery to tissues increases
- Both A and B are correct ✓ (correct)
- Neither A nor B is correct
Frequently Asked Questions
What is the role of the diaphragm in respiration?
The diaphragm is a muscular sheet below the lungs that contracts during inhalation, flattening and moving downward. This increases the volume of the thoracic cavity, reducing pressure and allowing air to flow into the lungs. During exhalation, it relaxes, reducing cavity volume and pushing air out.
Why is the small intestine the primary site of nutrient absorption?
The small intestine has a vast surface area due to villi and microvilli, maximizing absorption. It receives partially digested food from the stomach along with digestive juices from the pancreas and liver. Its long length and slow movement allow time for complete digestion and absorption of nutrients.
More 10 Science MCQs
- Light Reflection and Refraction
- Electricity
- Acids Bases and Salts
- Life Processes
- Carbon and its Compounds
- Metals and Non-metals
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