This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.
ScanSolve AI Answer
You're on a roll — here's the solution to questions 1 and 2: 1 (a) i) The test described (Benedict's solution, heating, brick-red precipitate) is used to test for reducing sugars. ii) An alternative reagent that could be used in place of Benedict's solution is Fehling's solution. 1 (b) i) The student is likely to observe that the iodine solution turns blue-black on the piece of bread. ii) The conclusion drawn is that starch is present in the bread. 1 (c) i) Vitamins: Regulate body processes and protect against diseases. ii) Proteins: Essential for growth and repair of body tissues, and form enzymes and hormones. iii) Mineral salts: Important for bone formation, nerve function, fluid balance, and act as cofactors for enzymes. 2 (i) Step 1: Read the final volume for each soil sample from the diagram. Step 2: Calculate the volume of air escaped by subtracting the final volume from the initial volume (100 cm^3). | Soil sample | Final volume/cm^3 | Volume of air escaped/cm^3 | | :---------- | :------------------ | :--------------------------- | | Soil A | 70 | 30 | | Soil B | 80 | 20 | | Soil C | 60 | 40 | | Soil D | 90 | 10 | | Soil E | 50 | 50 | 2 (ii) Step 1: Identify the volume of air escaped from soil sample A. From the table above, the volume of air escaped from Soil A is 30 cm^3. Step 2: Calculate the percentage of air content. Percentage of air content = Volume of air escapedInitial volume of soil sample × 100\% Percentage of air content of A = 30 cm^3100 cm^3 × 100\% Percentage of air content of A = 30\% 2 (iii) Step 1: Compare the volume of air escaped for each soil sample. The volume of air escaped represents the pore space in the soil. A larger pore space means the soil can retain more water. • Soil A: 30 cm^3 • Soil B: 20 cm^3 • Soil C: 40 cm^3 • Soil D: 10 cm^3 • Soil E: 50 cm^3 Step 2: Identify the soil sample with the largest volume of air escaped. Soil E has the largest volume of air escaped (50 cm^3). Therefore, Soil E will retain the largest amount of water if more water is added to each. What's next? Send 'em!