6.16.3 The Mechanism of Photosynthesis (Structured Question 1 & 2)

Question 1:Green plants synthesize their food through the process of photosynthesis. The chemical process of photosynthesis can be summarized as in the schematic diagram below.(a) State the meaning of photosynthesis based on the schematic diagram. [2 marks](b) Starting with water and carbon dioxide as the raw materials, describe how a green plant produces starch molecules. … Read more6.16.3 The Mechanism of Photosynthesis (Structured Question 1 & 2)

6.16.2 Food Digestion (Structured Question 1 & 2)

Question 1:(a) Diagram 1.1 shows human digestive system.Structure S in Diagram I is involved in the digestion of fat.(i) Name structure S.(ii) Name the enzyme which digests fat in S.(iii) Diagram 1.2 shows a mechanism of an enzyme reaction.Draw the diagram in the spaces III and IV provided in Diagram 1.2 to complete the mechanism … Read more6.16.2 Food Digestion (Structured Question 1 & 2)

6.16.1 Malnutrition (Structured Question 1 & 2)

Question 1:(a)(i) After absorption of nutrients in the small intestine, the undigested substances in the colon result in the formation of faeces.Explain the formation of faeces in a human. [4 marks](ii) Malnutrition is a condition due to taking an unbalanced diet in which certain nutrients are lacking, in excess or in the wrong proportions.Explain the … Read more6.16.1 Malnutrition (Structured Question 1 & 2)

6.5.1 Functions of the Liver and Assimilation

Transport of Nutrients by Circulatory System1.   Glucose, amino acids, minerals, vitamins B and C are absorbed into blood capillaries of the villus and carried out of the small intestine to the liver by the hepatic portal vein.2.   The hepatic portal vein transports the nutrients absorbed from the small intestine to the liver for processing and prepared for … Read more6.5.1 Functions of the Liver and Assimilation

6.5 Absorption and Assimilation of Digested Food

6.5 Absorption and Assimilation of Digested Food1.   Ileum is the major site of nutrient absorption.2.   Soluble nutrients are absorbed by simple diffusion, facilitated diffusion or active transport. Adaptive characteristics of the digestive system1.   The wall of the small intestine is covered with epithelial cells that are specialized to complete the digestive process.2.   The … Read more6.5 Absorption and Assimilation of Digested Food

6.4.2 Digestion in the Small Intestine

6.4.2 Digestion in the Small IntestineDigestion in the Small Intestine1.   The small intestine consists of the duodenum, jejunum and the highly coiled ileum.2.   The duodenum is the first part of the small intestine, receives chyme from the stomach and secretions from the gall bladder and pancreas.Digestion in the duodenum Liver1.   Bile is an alkaline, greenish-yellow … Read more6.4.2 Digestion in the Small Intestine

6.4 Food Digestion

6.4 Food Digestion 1.   Digestion is the process that breaks down complex food substances into simpler, soluble molecules that are small enough for the body to absorb.2.   Digestion breaks down  (a) carbohydrates into glucose molecules,  (b) proteins into amino acids, and  (c) lipids into glycerol and fatty acids.3.   Digestion involves both physical and chemical processes.4.   Physical digestion  (a) involves the breaking of … Read more6.4 Food Digestion