Subject: Integrated Science | Level: JHS (Basic 7 – 9) | Topic: Photosynthesis and Digestive System | Type: Multiple Choice Questions | Total Questions: 15
Original practice questions by Education Always. Not official BECE questions.
1. Where in the leaf does photosynthesis mainly occur?
A. The lower epidermis B. The palisade mesophyll cells C. The stomata D. The veins
Answer: B. Palisade cells are tightly packed near the top of the leaf and contain the most chloroplasts.
2. What three things are needed for photosynthesis?
A. Oxygen, glucose, and water B. Carbon dioxide, water, and light energy C. Nitrogen, sunlight, and glucose D. Chlorophyll, oxygen, and carbon dioxide
Answer: B. Photosynthesis requires carbon dioxide, water, and light energy (captured by chlorophyll).
3. Which gas is released as a by-product of photosynthesis?
A. Carbon dioxide B. Nitrogen C. Oxygen D. Hydrogen
Answer: C. Oxygen is released as a by-product and exits through the stomata.
4. A plant was placed in complete darkness for 48 hours. When its leaf was tested with iodine, the result was yellow-brown. What does this indicate?
A. The plant has stored starch from before B. The plant has been actively photosynthesising C. No photosynthesis occurred, so no starch was made D. The leaf cells have died
Answer: C. No photosynthesis in darkness means no starch is produced; iodine stays yellow-brown.
5. A farmer notices his cocoa trees have yellow leaves despite plenty of sunlight. Which mineral is most likely deficient?
A. Calcium B. Potassium C. Phosphate D. Magnesium
Answer: D. Magnesium is needed to make chlorophyll. Deficiency causes yellowing (chlorosis).
6. How does carbon dioxide enter a leaf for photosynthesis?
A. Through the roots B. Through the stem C. Through the stomata D. Through the waxy cuticle
Answer: C. CO₂ enters through tiny pores called stomata, mainly on the underside of the leaf.
7. Which enzyme in saliva begins the digestion of starch?
A. Pepsin B. Lipase C. Amylase D. Protease
Answer: C. Salivary amylase (ptyalin) in saliva begins breaking starch into maltose in the mouth.
8. In which organ does the digestion of proteins first begin?
A. Mouth B. Stomach C. Small intestine D. Large intestine
Answer: B. Protein digestion begins in the stomach where pepsin breaks proteins into peptides.
9. What is the role of bile in digestion?
A. It digests proteins into amino acids B. It kills bacteria in food C. It emulsifies fats, breaking them into smaller droplets D. It absorbs water from food
Answer: C. Bile emulsifies fats, increasing the surface area for lipase to work on.
10. Where is most absorption of digested nutrients absorbed into the blood?
A. Mouth B. Stomach C. Small intestine D. Large intestine
Answer: C. The small intestine, with its villi, is the main site of nutrient absorption.
11. What is the function of villi in the small intestine?
A. To produce digestive enzymes B. To increase the surface area for absorption of nutrients C. To produce bile for fat digestion D. To store food temporarily
Answer: B. Villi are finger-like projections that greatly increase the surface area of the small intestine for efficient absorption.
12. Glucose and amino acids absorbed in the small intestine pass directly into:
A. The lymph vessels (lacteals) B. The blood capillaries C. The liver D. The large intestine
Answer: B. Glucose and amino acids are absorbed into blood capillaries in the villi. Fatty acids go into lacteals.
13. What is the main function of the large intestine?
A. Digesting proteins B. Producing bile C. Absorbing water from undigested material D. Breaking down fats
Answer: C. The large intestine absorbs water from the remaining material, forming faeces.
14. A patient’s doctor tells him his pancreas is not functioning properly. Which type of digestion would be most affected?
A. Starch digestion in the mouth B. Protein digestion in the stomach C. Digestion of starch, proteins, and fats in the small intestine D. Water absorption in the large intestine
Answer: C. The pancreas produces amylase, protease, and lipase that digest all three main food types in the duodenum.
15. Which of the following correctly matches an organ with its function in digestion?
A. Liver: produces pepsin to digest proteins B. Stomach: absorbs glucose into the blood C. Gall bladder: stores bile produced by the liver D. Large intestine: produces pancreatic juice
Answer: C. The gall bladder stores bile that is produced by the liver and releases it into the duodenum when needed.
Answer Key
1-B, 2-B, 3-C, 4-C, 5-D, 6-C, 7-C, 8-B, 9-C, 10-C, 11-B, 12-B, 13-C, 14-C, 15-C
Scoring Guide
- 13 – 15: Excellent understanding of plant and human nutrition
- 10 – 12: Good. Review your weaker questions
- 7 – 9: Fair. Re-read the Photosynthesis and Digestive System lessons
- Below 7: Study both lessons carefully before trying again