5.5 Plants need to absorb mineral ions from the soil to enable them to produce other biological molecules. Complete the table by giving the missing information. Mineral ion absorbed Biological molecule produced magnesium [answer1] [answer2] protein (2)
Read Details9.9 A celery stalk was placed into a beaker of blue dye. When the dye reached the leaves, the stalk was taken out and a section was cut, as shown in the diagram Right-click on the blue button to open Fig 9.9(a) Which diagram shows the appearance of the cut end of the stalk? (1) Right-click on the blue button to open Fig 9.9(b) to see your options.
Read Details1.1 Complete the table by filling in the missing word to show the characteristic features of the three groups of organisms. Use a (yes) if the group has the characteristic and a (no) if the group does not have the characteristic. The first box has been done for you. (4) Group Can carry out photosynthesis Have a cell wall Can be pathogenic bacteria yes [a] [b] fungi [c] [d] [e] viruses [f] [g] [h]
Read Details5.2 Leaves can be tested for starch to show that photosynthesis has taken place. This is the method given in a biology textbook. 1. Remove the leaf you want to test from the plant. 2. Half fill a 250cm3 beaker with water and boil the water using a Bunsen burner. 3. Using a pair of forceps, hold the leaf in the boiling water for 20 seconds. 4. Turn the Bunsen burner off. 5. Using the forceps, push the leaf to the bottom of a boiling tube and cover it with ethanol. 6. Place the boiling tube in the beaker of very hot water. The ethanol will boil. 7. When the leaf is colourless, remove it from the boiling tube and wash it in cold water for a few seconds. 8. Place the leaf flat on a white tile. 9. Add dilute iodine solution with a pipette, making sure the whole leaf is covered. 10. Any starch present will react with the iodine solution.
Read Details