Two potted green plants of the same kind were taken to perform an experiment. One of them was kept in a dark room, while the other one was kept in sunlight for 3–4 days. A leaf from each of the plant was taken to perform the iodine test. Which of the leaves turned blue-black in colour? [5 MARKS]
Two potted green plants of the same kind were taken to perform an experiment. One of them was kept in a dark room, while the other one was kept in sunlight for 3–4 days. A leaf from each of the plant was taken to perform the iodine test. Which of the leaves turned blue-black in colour? [5 MARKS]
Each point: 1.5 Mark
Diagram: 2 Marks
1. Plants pepare their food by a process called photosynthesis. Photosynthesis as the name says requires sunlight to take place. In this process, plants take carbon dioxide and water to form sugar and release oxygen also. Starch gives a blue black colour with iodine.
2. The leaf placed in a dark room could not photosynthesize as there was no light and hence starch was not produced. Thus the leaves do not turn blue black with iodine. The leaf that was placed in a room there was light, produces starch and hence turns blue black with iodine.
Only the leaf of the plant kept in sunlight turns blue black.
Each point: 1.5 Mark
Diagram: 2 Marks
1. Plants pepare their food by a process called photosynthesis. Photosynthesis as the name says requires sunlight to take place. In this process, plants take carbon dioxide and water to form sugar and release oxygen also. Starch gives a blue black colour with iodine.
2. The leaf placed in a dark room could not photosynthesize as there was no light and hence starch was not produced. Thus the leaves do not turn blue black with iodine. The leaf that was placed in a room there was light, produces starch and hence turns blue black with iodine.
Only the leaf of the plant kept in sunlight turns blue black.
