Photosynthesis Experiments

Q. Indicate whether each of the following is true (T) or false (F).

A The presence of starch in the iodine test is confirmed by the appearance of brown colour. B During photosynthetic experiments, methylated spirit is used to decolourise the chlorophyll pigments. C The aquatic plant that is frequently used in experiments to verify the presence of oxygen is Hydrilla. D The chemical used in the test for carbon dioxide is potassium carbonate.

Q.

Which of the following would be indicators that can be used to observe transpiration occurring in a leaf?

1. pH paper

2. Litmus paper

3. Dry cobalt chloride paper

4. Bathophenanthroline Indicator Paper

Q.

The experimental set up show below is to show that ___ is necessary for photosynthesis.

1. oxygen

2. hydrogen

3. water

4. carbon dioxide

Q.

Pond weed was placed in five water-filled tubes and the experimental set up was allowed to remain as shown in the diagram alongside for 24 hours. In which tube would you expect to find:
(i) the greatest increase in the dry weight of the pond weed?
(ii) the plant with the least amount of starch?
(iii) the most oxygen?
(iv) the least carbon dioxide?
(v) the plant to survive for the longest length of time?

1. (i) Tube - 1
   (ii) Tube - 5
   (iii) Tube - 2
   (iv) Tube - 1
   (v) Tube - 4

2. (i) Tube - 2
   (ii) Tube - 2
   (iii) Tube - 3
   (iv) Tube - 4
   (v) Tube - 5

3. (i) Tube - 4
   (ii) Tube - 1
   (iii) Tube - 1
   (iv) Tube - 5
   (v) Tube - 2

4. (i) Tube - 2
   (ii) Tube - 5
   (iii) Tube - 1
   (iv) Tube - 1
   (v) Tube - 2

Q. The process of keeping a plant in the dark for a day or two is known as ___.

Q.

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

1. 1.5g of Potassium Permagnate

2. 2.5g of Potassium Nitrate

3. 0.5g of Sodium Iodide

4. 1.5g of Potassium Iodide

Q. The process of keeping a plant in the dark for a day or two is known as ___.

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

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

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. $\mathrm{Placed}\mathrm{in}\mathrm{hot}\mathrm{water}$

Q.

The production of starch, and not glucose, is often used as a measure of photosynthesis in leaves because

(a) starch is the immediate product of photosynthesis.

(b) glucose formed in photosynthesis soon gets converted into starch.

(c) starch is soluble in water.

(d) sugar cannot be tested.