Question

1.Отрежьте кусочек клубня картофеля2.Нанесите на него каплю разбавленного раствора йода.3. Проследите,как изменилась окраска кусочка клубня.4. Сделайте вывод о том, какое запасное вещество откладывается в клубне картофеля . В клетках какй ткани оно откладывается?

Answer 1

В картофеле содержится крахмал, который окрасится йодом от синего до темно-фиолетового цвета (зависит от концентрации йода). в клубные картофеля откладывается крахмал в строме пластид клеток растения

Answer 2

Answer in detail. 1. Cut off a piece of potato tuber. 2. Apply a drop of diluted iodine solution to it. 3. Observe how the color of the tuber piece changed. 4. Draw a conclusion about what reserve substance is deposited in the potato tuber. In which tissue cells is it deposited?

This is a biology experiment to test the presence of starch in a potato tuber. Here are the steps and the results:

1. Cut off a piece of potato tuber. You can use a knife or a scalpel to do this. Make sure the piece is not too big or too small, about 2 cm by 2 cm. 2. Apply a drop of diluted iodine solution to it. You can use a dropper or a pipette to do this. Place the drop on the cut surface of the potato piece. Be careful not to spill the iodine solution, as it can stain your skin and clothes. 3. Observe how the color of the tuber piece changed. You will notice that the iodine solution turns from yellow-brown to dark blue or black on the potato piece. This is a positive reaction that indicates the presence of starch in the potato tuber. 4. Draw a conclusion about what reserve substance is deposited in the potato tuber. In which tissue cells is it deposited? You can conclude that starch is the reserve substance that is deposited in the potato tuber. Starch is a complex carbohydrate that is composed of many glucose molecules. Plants store starch as a source of energy for later use. Starch is deposited in the cells of the parenchyma tissue, which is the main tissue of the potato tuber. Parenchyma cells are thin-walled and have large vacuoles that can store starch granules.