Experiments Conducted to Prove the Formation of Starch in Plants

Q.

Which one of the following statements about the events of non-cyclic photophosphorylation is incorrect?

1. 0₂ is released.

2. Only one photosystem participates.

3. Photolysis of water occurs.

4. ATP and NADPH are produced.

Q.

Which of the following statements is true with regard to the light reaction of the photosynthetic mechanism in plants?

1. Chlorophyll a occurs with peak absorption at 680 nm in photosystem I and at 700 nm in photosystem II.

2. Photosystems I and II are both involved in non-cyclic photophosphorylation

3. Magnesium and sodium ions are associated with photolysis of water molecules.

4. Both ATP and NADPH₂ are formed during cyclic photophosphorylation.

5. 0₂ is evolved during cyclic photophosphorylation.

Q.

A leaf is boiled in alcohol before using iodine for a starch test in order to-

1. Dissolve starch

2. Dissolve chlorophyll

3. Soften the leaf

4. Make it react with iodine

Q.

ATP can be formed in the photosynthesising plant cells by

1. C₄ cycle

2. C₃ cycle

3. Photophosphorylation

4. CAM pathway

Q. Which of the following would give a positive test with iodine solution?

1. Vitamin A
2. Starch
3. Protein
4. Butter

Q. Which of the following components was common to both variegated leaf experiment and Mohl’s half leaf experiment?

1. KOH
2. Iodine
3. Cladophora
4. Purple and green sulphur bacteria

Q.

Starch gives color with iodine.

Q. How many cell types does the leaf have that fix co2 in both c3 and c4 cycles ??

Q. Pick out the common storage places of starch in plants.

1. Amyloplasts
2. Roots
3. Seeds

4. All of the above

Q. On adding iodine to a leaf boiled in alcohol, a blue-black colour appears. This means that

1. Starch is produced in the leaf
2. Starch is not produced in the leaf
3. Glucose is produced in the leaf
4. Glucose is not produced in the leaf

Q. The most common storage form of glucose in plants is

1. starch
2. glycogen
3. chitin
4. cellulose