Question

How would you test the presence of starch in leaves? I have some words of first step please tell me another steps :1st :first l wil take leaf from wil aluminium plant l................... and do not send answer with the help of Google l request you suhani and other if you give the Answer with the help of Google l do not mark as brainlst because I know answer of google

Answer 1

Here’s the experiment.

Aim: To test the presence of starch in leaves

Materials required: A green leaf, water, alcohol, test tube, beaker and iodine solution.

Procedure:

1. Place a leaf in a test tube and pour some alcohol in it.

2. Heat some water in a beaker and put the test tube containing the leaf into the beaker. Chlorophyll dissolves in warm alcohol. The leaf thus loses its green colour and becomes colourless. This is required to clearly see any colour change on addition of iodine.

3. Remove the leaf and pour some iodine on it.

Observation: The colour of the leaf turns blue-black.

Conclusion: The leaf contains starch.

Answer 2

Explanation:

AIM: presence of starch in leaves

MATERIAL REQUIRED: a fresh leaf, glass disc, iodine solution, Bunsen burner, water, beaker, dropped.

PROCEDURE:

1. Fill water in the beaker and boil it for 2 minutes.
2. Take the leaf and boil it along with water.
3. Take the leaf out and keep it in the glass disc.
4. Let the leaf cool down.
5. Put 2-3 drops of iodine solution in it.

OBSERVATIONS AND CONCLUSION:

It is observed that the leaf has turned blue black in colour, which marks the presence of starch in leaves.