Question

Q8. Observe the experiment and answer the following questions -Boiling water Leaf boiled in water Step 2 -Alcohol Leaf transferred in a test tube containing alcohol Step 3 Blue-black Water Leaf Step 1 Gently heat water to make alcohol boil Step 4 Leaf washed in tap water Step 5 Drops of solution added Step 6 (a) What does the above experiment prove? (b) Name the solution used for the test. (c) What is the substance stored by the plant's leaf?​

Answer 1

Answer:

(a)

Explanation:

(a) The above experiment proves the presence of starch in leaves.

(b) The solution used for the test is Iodine.

(c) The substance stored by the plant leaves is starch.

Answer 2

Answer:

This experiment is to test the presence of starch.

Explanation:

• The experiment proves the presence of starch in leaves
• The solution used is iodine to detect starch
• The leaf stores starch as a source of energy
• Plants consume starch, a white, powdery material made of glucose, as sustenance.
• While hot water kills the leaf, alcohol degrades chlorophyll. The leaf is no longer green as a result.
• One of the leaves changes to a blue-black colour after being exposed to iodine because starch is present and iodine serves as an indication.
• The colour of the other leaf changes to a reddish-brown hue.
• The leaf that was exposed to light changes colour from green to blue-black, suggesting that it has been undergoing photosynthesis and making starch.

The existence of starch in leaves serves as sufficient proof that photosynthesis occurs in leaves because starch creation requires photosynthesis.

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