Copy and complete the following by filling in the blanks 1 to 5 with appropriate words/terms/phrases:
To test the leaf for starch, it is boiled in water to..........….
It is next boiled in methylated spirit to............
The leaf is placed in warm water to soften it. It is then placed in a dish an........... solution is added.
The region which contains starch turn.......…,
and the region which does not contain starch turn.......... .

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Solution

Final Answer:
To test the leaf for starch, it is boiled in water to kill the cells
It is next boiled in methylated spirit to remove the chlorophyll
The leaf is placed in warm water to soften it. It is then placed in a dish and iodine solution is added.
The region which contains starch turns blue-black in color.
and the region which does not contain starch turn brown.

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Similar questions

Complete the following by filling the blanks 1 to 5 with appropriate words/terms/phrases:

To test the leaf for starch, the leaf is boiled in water to ................. (1). It is next boiled in methylated spirit to .................(2). The leaf is placed in warm water to soften it. It is then placed in a dish and ..................(3) solution is added. The region, which contains starch, turns ...................(4) and the region, which does not contain starch, turns ............................(5).

To test a leaf for starch, the leaf is boiled in water to (i) ____________.

It is then boiled in Methylated spirit to (ii) ___________.

The leaf is dipped in warm water to soften it. It is places in a petri dish, and (iii) __________ solution is added.

The region of the leaf which contains starch, turns (iv) _________ and the region which does not contain starch turns (v) ___________.

Q. In an experiment to test the presence of starch in a leaf, the plucked leaf is first boiled in water for a few minutes. This is an important step in the experiment because it :
(1) converts glucose made in the leaf into starch
(2) dissolves chlorophyll present in the green leaf
(3) extracts starch to destarch the leaf
(4) makes the leaf more permeable to iodine solution

Q. In the experiment to show that light is necessary for photosynthesis, the plucked leaf is boiled in ethanol and then washed with water. After this, it is tested for the presence of a carbohydrate by a chemical which is :
(1) salt solution
(2) sugar solution
(3) iodine solution
(4) starch solution

Q. In the experiment to demonstrate that starch is made as food by the process of photosynthesis, the plucked leaf is first boiled in water for about 3 to 5 minutes in order to :

(1) remove chlorophyll from leaf cells

(2) break down the cell membranes of leaf cells

(3) soften the brittle leaf

(4) convert starch into glucose so that is can be tested easily

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