IGCSE Combined Sciences Biology 0653
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IGCSE Combined Sciences Biology Paper 4 Extended Theory Topic Questions 2025 /2026/2027 Exams / 11-Gas-Exchange Paper 4 Topic Questions Combined Sciences
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Gas-Exchange Paper 4 Topic Questions Combined Sciences /2025/2026/2027 Exams

IGCSE Combined Sciences Biology Paper 4 Extended Theory Topic Questions 2025 /2026/2027 Exams
1-Characteristics and classification of living organisms Paper 4 Topic Questions
1
define-respiration-1.pdf Locked
2-Cells Paper 4 Topic Questions Combined Sciences
2.0.0
Definitions-qp-ms.pdf Locked
2.1.1
Plant-Cell-Structure-and-Function-qp-ms-1.pdf Locked
Plant-Cell-Structure-and-Function-qp-ms-2.pdf Locked
Plant-Cell-Structure-and-Function-qp-ms-3.pdf Locked
Plant-Cell-Structure-and-Function-qp-ms-4.pdf Locked
Plant-Cell-Structure-and-Function-qp-ms-5.pdf Locked
Plant-Cell-Structure-and-Function-qp-ms-6.pdf Locked
2.2.1
Animal-cell-Features-Functions-qp-ms-1.pdf Locked
2.3.1
Difference between plants and animals-qp-ms-1.pdf Locked
Difference between plants and animals-qp-ms-2.pdf Locked
2.4.1
Root hair cell-qp-ms-1.pdf Locked
Root hair cell-qp-ms-2.pdf Locked
Root hair cell-qp-ms-3.pdf Locked
Root hair cell-qp-ms-4.pdf Locked
Root hair cell-qp-ms-5.pdf Locked
Root hair cell-qp-ms-6.pdf Locked
2.5.1
Red blood cell-qp-ms-1.pdf Locked
Red blood cell-qp-ms-2.pdf Locked
2.6.1
specialised-cells-mixed-bag-1-qp-ms.pdf Locked
specialised-cells-mixed-bag-2-qp-ms.pdf Locked
specialised-cells-mixed-bag-3-qp-ms.pdf Locked
specialised-cells-mixed-bag-4-qp-ms.pdf Locked
2.7.1
Palisade cells-qp-ms-1.pdf Locked
Palisade cells-qp-ms-2.pdf Locked
2.8.1
Magnification-qp-ms-1.pdf Locked
2.9.1
Identifying-cells-organs-tissues-organ-systems-qp-ms-1.pdf Locked
Identifying-cells-organs-tissues-organ-systems-qp-ms-2.pdf Locked
Identifying-cells-organs-tissues-organ-systems-qp-ms-3.pdf Locked
Identifying-cells-organs-tissues-organ-systems-qp-ms-4.pdf Locked
3-Movement in and out of cells Paper 4 Topic Questions Combined Sciences
3.0.0
Define-diffusion-qp-ms-1.pdf Locked
3.1.1
Factors-affecting-diffusion-qp-ms.pdf Locked
3.1.2
Factors-affecting-diffusion-qp-ms.pdf Locked
3.1.3
Factors-affecting-diffusion-qp-ms.pdf Locked
3.1.4
Factors-affecting-diffusion-Osmosis-qp-ms.pdf Locked
Factors-affecting-diffusion-Osmosis-qp-ms-1.pdf Locked
3.2.1
Application-of-Osmosis-qp-ms.pdf Locked
3.2.2
Application-of-Osmosis-qp-ms.pdf Locked
3.2.3
Application-of-Osmosis-qp-ms.pdf Locked
3.3.1
Application-of-Diffusion-qp-ms.pdf Locked
3.3.2
Application-of-Diffusion-qp-ms.pdf Locked
3.3.3
Application-of-Diffusion-qp-ms.pdf Locked
3.3.4
Application-of-Diffusion-qp-ms.pdf Locked
3.3.5
Application-of-Diffusion-qp-ms.pdf Locked
3.5.1
Effect-of-immersing-cells-in-solutions-of-different-concentrations-qp-ms.pdf Locked
4-Biological molecules Paper 4 Topic Questions Combined Sciences
4.0.0
Drawing-starch-molecule-qp-ms.pdf Locked
4.0.1
Starch-Glycogen-molecule-qp-ms.pdf Locked
4.0.2
Proteins-Amino acids-qp-ms.pdf Locked
4.1.1
Test-for-starch-qp-ms.pdf Locked
4.1.2
Test-for-starch-qp-ms.pdf Locked
4.2.1
Reducing sugar test-qp-ms.pdf Locked
5-Enzymes Paper 4 Topic Questions Combined Sciences
5.1.1
Enzyme-Basics-qp-ms-1.pdf Locked
Enzyme-Basics-qp-ms-2.pdf Locked
Enzyme-Define-qp-ms.pdf Locked
5.2.2
Effect-of-temperature-on-enzyme-activity-qp-ms.pdf Locked
5.2.3
Effect-of-temperature-on-enzyme-activity-qp-ms.pdf Locked
5.2.4
Effect-of-temperature-on-enzyme-activity-qp-ms.pdf Locked
5.2.5
Effect-of-temperature-on-enzyme-activity-qp-ms.pdf Locked
5.2.6
Effect-of-temperature-on-enzyme-activity-qp-ms.pdf Locked
5.2.7
Effect-of-temperature-on-enzyme-activity-qp-ms.pdf Locked
5.2.9
Effect-of-temperature-on-enzyme-activity-qp-ms.pdf Locked
5.2.10
Effect-of-temperature-on-enzyme-activity-qp-ms.pdf Locked
5.2.11
Effect-of-temperature-on-enzyme-activity-qp-ms.pdf Locked
5.3.1
Effect-of-temperature-and-pH-on-enzyme-activity-qp-ms.pdf Locked
5.3.2
Effect-of-temperature-and-pH-on-enzyme-activity-qp-ms.pdf Locked
5.3.3
Effect-of-pH-on-enzyme-activity-qp-ms.pdf Locked
5.3.4
Effect-of-pH-on-enzyme-activity-qp-ms.pdf Locked
5.3.5
Effect-of-pH-on-enzyme-activity-qp-ms.pdf Locked
5.3.6
Effect-of-pH-on-enzyme-activity-qp-ms.pdf Locked
5.3.7
Effect-of-pH-on-enzyme-activity-qp-ms.pdf Locked
6-Plant Nutrition Paper 4 Topic Questions Combined Sciences
6.0.0
Photosynthesis-Equation-qp-ms.pdf Locked
6.0.1
Photosynthesis-Basics-qp-ms.pdf Locked
Photosynthesis-Basics-qp-ms-1.pdf Locked
6.2.3
Mesophyll-Cell-qp-ms.pdf Locked
6.3.1
Effect-of-light-intensity-on-photosynthesis-qp-ms.pdf Locked
6.3.1.1
Carbohydrates-Manufacture and use-ms.pdf Locked
6.4.1.1
Photosynthesis-equation-ms.pdf Locked
6.4.1.2
Photosynthesis-equation-ms.pdf Locked
Photosynthesis-equtn-Role of chlorophysll -ms.pdf Locked
6.5.1.1
Photosynthesis-Effect of light intensity-ms.pdf Locked
6.5.1.2
Photosynthesis-Effect of light intensity-ms.pdf Locked
6.5.1.3
Photosynthesis-Effect of light intensity-ms.pdf Locked
6.5.1.4
Use-of-Glucose-made-in-photosynthesis-qp-ms.pdf Locked
6.5.1.5
Photosynthesis-Effect-of-Temperature-qp-ms.pdf Locked
6.5.1.6
Photosynthesis-Effect of light intensity-ms.pdf Locked
6.5.2
Effect-of-light-intensity-pH-on-Photosynthesis-qp-ms.pdf Locked
6.6.1
Chlorophyll-qp-ms.pdf Locked
6.6.2
Chlorophyll-qp-ms.pdf Locked
6.6.3
Chlorophyll-qp-ms.pdf Locked
6.6.4
Chlorophyll-qp-ms.pdf Locked
6.7.1
Phloem-qp-ms.pdf Locked
6.7.2
Phloem-qp-ms.pdf Locked
6.8.1
Photosynthesis-Stomata-qp-ms.pdf Locked
6.9.1
Leaf-Structure-qp-ms.pdf Locked
6.9.2
Leaf-Structure-qp-ms.pdf Locked
6.9.3
Leaf-Structure-qp-ms.pdf Locked
7-Human Nutrition Paper 4 Topic Questions Combined Sciences
7.0.0
Organs-of-the-alimentary-canal-Set-1-qp-ms.pdf Locked
7.0.1
Balanced-Diet-qp-ms.pdf Locked
Organs-of-the-alimentary-canal-Set-1-qp-ms.pdf Locked
7.0.2
Organs-of-the-alimentary-canal-Set-1-qp-ms.pdf Locked
7.0.3
Organs-of-the-alimentary-canal-Set-1-qp-ms.pdf Locked
7.0.4
Organs-of-the-alimentary-canal-Set-1-qp-ms.pdf Locked
7.0.5
Organs-of-the-alimentary-canal-Set-1-qp-ms.pdf Locked
7.1.1
Starch-digestion-Set-1-qp-ms.pdf Locked
7.2.1
Digestion of food in stomach-ms.pdf Locked
7.3.1
Fat-digestion-Set-1-qp-ms.pdf Locked
Fat-digestion-Set-1-qp-ms-1.pdf Locked
Fat-digestion-Set-1-qp-ms-2.pdf Locked
Fat-digestion-Set-1-qp-ms-3.pdf Locked
7.4.1
Importance-of-fibre-Set-1-qp-ms.pdf Locked
7.4.2
Importance-of-fibre-Set-1-qp-ms.pdf Locked
7.5.1
Vitamin-D-Iron-Balanced-Diet-Digestion.pdf Locked
7.6.1
Calcium in food-Set-1-qp-ms.pdf Locked
7.7.1
Energy content of food-Set-1-qp-ms.pdf Locked
7.8.1
pH-and-digestion-Set-1-qp-ms.pdf Locked
7.9.1
Chemical-mechanical-digestion-Set-1-qp-ms.pdf Locked
7.9.2
Chemical-mechanical-digestion-Set-1-qp-ms.pdf Locked
7.9.3
Chemical-mechanical-digestion-Set-1-qp-ms.pdf Locked
7.9.4
Chemical-mechanical-digestion-Set-1-qp-ms.pdf Locked
7.9.5
Chemical-mechanical-digestion-Set-1-qp-ms.pdf Locked
7.9.6
Chemical-mechanical-digestion-Set-1-qp-ms.pdf Locked
7.10.1
Effects-of-malnutrition-Set-1-qp-ms.pdf Locked
7.11.1
Malnutrition-Set-1-qp-ms.pdf Locked
Malnutrition-Set-2-qp-ms.pdf Locked
7.12.1
Digestive-enzymes-Set-1-qp-ms.pdf Locked
7.12.2
Digestive-enzymes-Set-1-qp-ms.pdf Locked
7.12.3
Digestive-enzymes-Set-1-qp-ms.pdf Locked
7.12.4
Digestive-enzymes-Set-1-qp-ms.pdf Locked
7.12.5
Digestive-enzymes-Set-1-qp-ms.pdf Locked
7.12.6
Digestive-enzymes-Set-1-qp-ms.pdf Locked
7.12.7
Digestive-enzymes-Set-1-qp-ms.pdf Locked
7.12.8
Digestive-enzymes-Set-1-qp-ms.pdf Locked
7.13.1
Scurvy-Obese-Fibre-Respiration-qp-ms.pdf Locked
7.15.1
Role-of-capillary-in-digestion-Set-1-qp-ms.pdf Locked
7.16.1
Function-of-HCl-and-gastric-juice-qp-ms.pdf Locked
Function-of-HCl-in-stomach-qp-ms.pdf Locked
Function-of-organs-of-alimentary-canal-qp-ms.pdf Locked
8-Transport in Plants Paper 4 Topic Questions Combined Sciences
8.1.1
identify-xylem-phloem-qp-ms.pdf Locked
8.1.2
identify-xylem-phloem-qp-ms.pdf Locked
8.1.4
Xylem-phloem-qp-ms.pdf Locked
8.1.5
Transport in phloem-qp-ms.pdf Locked
8.1.6
Transport of carbohydrates-qp-ms.pdf Locked
8.1.7
Transport in phloem-qp-ms.pdf Locked
8.2.1
Root hair cells-Function-qp-ms.pdf Locked
8.3.1
Root hair cells -Transpiration-qp-ms.pdf Locked
8.3.2
Transpiration-data-based-question-qp-ms.pdf Locked
8.3.3
Transpiration-process-qp-ms.pdf Locked
8.3.4
Transpiration-process-qp-ms.pdf Locked
8.3.5
Transpiration-process-qp-ms.pdf Locked
8.3.6
Transpiration-process-qp-ms.pdf Locked
8.3.7
Transpiration-process-qp-ms.pdf Locked
8.4.1
Transpiration-experiment-qp-ms.pdf Locked
8.4.2
Transpiration-experiment-qp-ms.pdf Locked
8.5.1
Factors-affecting-transpiration-qp-ms.pdf Locked
8.6.1
Transpiration-Basics-qp-ms.pdf Locked
8.7.1
Movement of water-Explanataion-qp-ms.pdf Locked
8.7.2
Movement of water-Explanataion-qp-ms.pdf Locked
8.7.3
Movement of water-Explanataion-qp-ms.pdf Locked
8.7.4
Movement of water-Explanataion-qp-ms.pdf Locked
8.7.5
Movement of water-Explanataion-qp-ms.pdf Locked
8.7.6
Movement of water-Explanataion-qp-ms.pdf Locked
8.8.1
Translocation-qp-ms.pdf Locked
9-Transport in Animals Paper 4 Topic Questions Combined Sciences
10-Diseases and Immunity Paper 4 Topic Questions Combined Sciences
11-Gas-Exchange Paper 4 Topic Questions Combined Sciences
12-Respiration Paper 4 Topic Questions Combined Sciences
13-Drugs Paper 4 Topic Questions Combined Sciences
14-Reproduction Paper 4 Topic Questions Combined Sciences
14.0.0
Flower-parts-Labelling-qp-ms.pdf Locked
14.1.1
Wind pollinated flowers-qp-ms.pdf Locked
14.1.2
Wind pollinated flowers-qp-ms.pdf Locked
14.1.3
Wind pollinated flowers-qp-ms.pdf Locked
14.1.4
Wind pollinated flowers-qp-ms.pdf Locked
14.2.1
Insect-Wind pollinated flowers-qp-ms.pdf Locked
14.2.2
Insect-Wind pollinated flowers-qp-ms.pdf Locked
14.2.3
Insect-Wind pollinated flowers-qp-ms.pdf Locked
14.2.4
Insect-Wind pollinated flowers-qp-ms.pdf Locked
14.2.5
Insect-Wind pollinated flowers-qp-ms.pdf Locked
14.3.1
Pollnation by insects-qp-ms.pdf Locked
14.3.2
Pollnation by insects-qp-ms.pdf Locked
14.3.3
Pollnation by insects-qp-ms.pdf Locked
14.4.1
Pollnation by insects-wind-ms.pdf Locked
14.5.01
Male-Female-reproductive -system-qp-ms.pdf Locked
14.5.1
Wind pollination-qp-ms.pdf Locked
14.6.1
Conditios for germination-qp-ms.pdf Locked
14.6.2
Conditios for germination-qp-ms.pdf Locked
14.6.3
Conditios for germination-qp-ms.pdf Locked
14.7.1
Fertilisation-Difference-Between-Plants-Animlas-qp-ms.pdf Locked
14.8.1
Pollination-qp-ms.pdf Locked
14.8.2
Pollination-qp-ms.pdf Locked
14.9.1
Wind-Pollinated-pollen-qp-ms.pdf Locked
14.30.0
Sperm cell-ms.pdf Locked
14.30.1
Male-Reproductive-System-qp-ms.pdf Locked
14.30.2
Male-Reproductive-System-qp-ms.pdf Locked
14.40.1
Labelling-Female-Reproductive-System-qp-ms.pdf Locked
14.40.2
Labelling-Female-Reproductive-System-qp-ms.pdf Locked
14.40.4
Labelling-Female-Reproductive-System-qp-ms-no-ms.pdf Locked
14.40.5
Labelling-Female-Reproductive-System-qp-ms.pdf Locked
14.403
Labelling-Female-Reproductive-System-qp-ms.pdf Locked
15-Organisms and their Environment Paper 4 Topic Questions Combined Sciences
15.0.0
Basics-qp-ms.pdf Locked
15.1.1
Food chain-qp-ms.pdf Locked
15.1.2
Food chain-qp-ms.pdf Locked
15.1.3
Food chain-qp-ms.pdf Locked
15.2.1
Food-chain-Energy-Loss-qp-ms.pdf Locked
15.2.2
Food-chain-Energy-Loss-qp-ms.pdf Locked
15.2.3
Food chains-Enegy-loss-Decomposers-qp-ms.pdf Locked
15.3.1
food-chain-identify-trophic-level-qp-ms.pdf Locked
15.3.2
food-chain-identify-trophic-level-qp-ms.pdf Locked
15.4.1
Food-web-qp-ms.pdf Locked
15.4.2
Food-web-Energy-loss-qp-ms.pdf Locked
15.4.3
Food-web-Energy-loss-qp-ms.pdf Locked
15.4.4
Food-web-Energy-loss-qp-ms.pdf Locked
15.4.5
Food webs-qp-ms.pdf Locked
15.4.6
Food webs-qp-ms.pdf Locked
15.4.7
Food webs-qp-ms.pdf Locked
15.4.8
Food webs-qp-ms.pdf Locked
15.5.1
carbon-cycle-qp-ms.pdf Locked
15.5.2
carbon-cycle-qp-ms.pdf Locked
15.5.3
carbon-cycle-qp-ms.pdf Locked
15.5.4
carbon-cycle-qp-ms.pdf Locked
15.5.5
carbon-cycle-qp-ms.pdf Locked
16-Human Influences on Ecosystems Paper 4 Topic Questions Combined Sciences
16.0.0
Define-Ecosystem-qp-ms.pdf Locked
16.0.1
Define-Ecosystem-qp-ms.pdf Locked
16.1.1
Freshwater-and-Marine-pollution-qp-ms.pdf Locked
16.1.2
Freshwater-and-Marine-pollution-qp-ms.pdf Locked
16.1.3
Freshwater-and-Marine-pollution-qp-ms.pdf Locked
16.1.4
Freshwater-and-Marine-pollution-qp-ms.pdf Locked
16.2.1
Effects-of-deforestation-qp-ms.pdf Locked
16.2.2
Effects-of-deforestation-qp-ms.pdf Locked
16.2.3
Effects-of-deforestation-qp-ms.pdf Locked
16.2.4
Effects-of-deforestation-qp-ms.pdf Locked
16.2.5
Effects-of-deforestation-qp-ms.pdf Locked
16.2.6
Effects-of-deforestation-qp-ms.pdf Locked
16.3.1
Increase-in-carbondioxide=in-the-atmosphere-qp-ms.pdf Locked
16.3.2
Increase-in-carbondioxide=in-the-atmosphere-qp-ms.pdf Locked
16.3.3
Increase-in-carbondioxide=in-the-atmosphere-qp-ms.pdf Locked
16.4.1
Extinction of species-qp-ms.pdf Locked
16.5.1
Endangered-Species-Deforestation-qp-ms.pdf Locked
16.6.1
Biodiversity-qp-ms.pdf Locked