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Photosynthesis

Complete the ...

Question

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).

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Solution

kill the cells (1); remove chlorophyll (2); iodine (3); blue-black (4); brown (5).

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Q. Complete the following paragraph by filling in the blanks (i) to (v) with appropriate words:
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 placed 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

The steps in a starch test have been listed below.

1) Place the leaf in methylated spirit and heat it over a water bath

2) Pour iodine over it

3) Place the leaf in water

4) Place the leaf in boiling water

Which of the following correctly lists the order in which the steps are to be carried out.

Why is the leaf boiled in water and alcohol before testing for the presence of starch?

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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