Experiments on Photosynthesis

Q.

Write an activity to show the effect of saliva on starch.

Q. Plant -> Destarched -> Part of leaf covered with black paper strip -> Starch test
These steps prove the importance of in photosynthesis.

1. chlorophyll
2. sunlight
3. carbon dioxide
4. oxygen

Q. Appearance of red colour on adding iodine to the leaf indicates the presence of starch.

1. True
2. False

Q.

Determine the methods used to test for each of the following in milk.

Starch -	(A) _____
Detergent -	(B) _____
Urea -	(C) _____
Water -	(D) _____

1. A - Vigorous shaking, B - Iodine test, C - Lactometer, D - Litmus test

2. A - Iodine test, B - Vigorous shaking, C - Litmus test, D - Lactometer

3. A - Iodine test, B - Lactometer, C - Litmus test, D - Vigorous shaking

4. A - Litmus test, B - Vigorous shaking, C - Iodine test, D - Lactometer

Q.

Iodine is used to test the presence of starch.

1. True

2. False

Q. The process of keeping a plant in the dark for one or two days while testing for photosynthesis is known as

1. dormancy
2. destarching
3. starching
4. phosphorylation

Q.

The confirmation of the presence of carbohydrate can be done using:

1. Iodine

2. Copper sulphate solution

3. Caustic soda

4. All of the above

Q.

Iodine solution is prepared using 0.3g of Iodine and __________________ in 100ml of water.

1. 2.5g of Potassium Nitrate

2. 1.5g of Potassium Permagnate

3. 0.5g of Sodium Iodide

4. 1.5g of Potassium Iodide

Q. A destarched leaf and a potted plant is coated with Vaseline on both sides and placed in sunlight. After a few hours, it is tested for the presence of starch. Will the test be positive or negative?

Q. A variegated leaf has green as well as non-green parts.

1. False
2. True

Q.

Leaves that consist of both green and non-green parts are called variegated leaves.

1. True

2. False

Q. The non-green part of a variegated leaf, after the starch test, exhibits colour due to the absence of

1. brown
2. blue black
3. sunlight
4. chlorophyll

Q.

Presence of starch in a substance can be detected by ___.

1. vitamin

2. iodine solution

3. sulphur solution

4. calcium powder

Q.

On treatment with iodine, the presence of starch is confirmed by the appearance of:

1. Blue-black colour

2. Blue colour

3. Red colour

4. Pink colour

Q. $\mathrm{Sort}\mathrm{the}\mathrm{following}\mathrm{steps}\left(\mathrm{from}\mathrm{top}\mathrm{to}\mathrm{bottom}\right)\mathrm{involved}\mathrm{in}\mathrm{the}\mathrm{treatment}\mathrm{of}a\mathrm{leaf}\mathrm{to}\mathrm{test}\mathrm{for}\mathrm{the}\mathrm{presence}\mathrm{of}\mathrm{starch}.$

1. $\mathrm{Boil}\mathrm{in}\mathrm{spirit}$
2. $\mathrm{Boil}\mathrm{in}\mathrm{water}$
3. $\mathrm{Blue}-\mathrm{black}\mathrm{color}$
4. $\mathrm{Perform}\mathrm{iodine}\mathrm{test}$
5. $\mathrm{Placed}\mathrm{in}\mathrm{hot}\mathrm{water}$