How would you test the presence of starch in leaves?
Answers
For this, we need to perform an experiment.
Aim- Test the presence of starch in leaves
Procedure-
1. First, let's have two healthy plants that are potted. Remember that they should be the same type.
2. Give numbers to your potted plants.
3. Keep the number 1 potted plant in a dark room for a couple of days. Because keeping plants in a dark room will remove all the starch from the leaves.
4. Keep the number 2 potted plant in sunlight.
5. After a couple of days take one leave from each of the plants which are numbered. Then put a few drops of iodine solution on leaves.
6. Please note what is going to be changed in the color of the leaves.
Observations-
You won't observe blue-black color on the leave of plant number 1 kept in the darkroom. This means it indicates the absence of starch. You will observe blue-black color on the leaves of the number 2 plant kept in sunlight. This means it indicates the presence of starch.
Plants prepare glucose during photosynthesis which gets stored in plants in the form of starch. Iodine turns blue-black when reacted with starch.
Hope it helps you :)
Answer:
Take two potted plants of the same kind. Keep one in the dark for 72 hours and the other in sunlight. Perform the iodine test with the leaves of both the plants as given below. Now leave the pot which was earlier kept in the dark, undisturbed for 3 – 4 days and perform the iodine test again on its leaves.
Iodine test:
Put iodine solution on the leaf
Observation:
Blue-black colour will be observed on the leaves of the plant kept in sunlight, which indicates the presence of starch.
Blue-black colour will not be observed on the leaves of plant kept in the darkroom. This indicates the absence of starch.