Dark Reaction

Q. Explain why the dark phase of photosynthesis is called a dark reaction.

Q.

Plants cannot store glucose as it is, but store in the form of starch because glucose is insoluble in water.

1. True

2. False

Q.

Dark reaction takes place in the __ of the chloroplasts.

1. stroma

2. grana

3. membrane

4. thylakoid

Q.

The dark reaction in photosynthesis is called so because_____.

1. occurs rapidly at night

2. it cannot occur during daytime

3. it is light dependent

4. it is light independent

Q. Dark reaction and light reaction of photosynthesis takes place in the

1. Stroma and grana of chloroplast respectively
2. Grana and stroma of chloroplast respectively
3. Grana only
4. Stroma only

Q.

Dark reaction of photosynthesis is called so because it occurs only during night.

1. True
2. False

Q. How is unused energy stored in plants ?

Q.

What effect does RuBisCo have in a normal plant?

1. It mediates the formation of glucose

2. It stimulates formation of ATP

3. It stimulates the conversion of starch to glucose

4. It increase the absorption of the glucose in leaves phloem

Q.

Does dark reaction occur at night or dark?

Q. Dark reaction occurs during the night.

1. False
2. True

Q.

what are the functions of H2O and chlorophyll in the process of photosynthesis

Q. Refer to the image and identify the site for light and dark reaction respectively.

1. A - Light Reaction, C - Dark reaction
2. D - Light Reaction, B - Dark reaction
3. D - Light Reaction, C - Dark reaction
4. D - Light Reaction, A - Dark reaction

Q.

During the night, $K^{+}$ and $C{l}^{-}$ ions move passively out of the guard cells. This results in

1. Increase in the water potential of guard cells

2. Closure of stomata

3. Wilting of leaves

4. pH of the guard cells increases

Q.

Which of the following is a mismatch?

1. Fructose - oilseeds

2. Protein - legumes

3. Sugarcane - sucrose

4. Starch - tuber

Q.

Identify the correct sequence of steps in the process of photosynthesis.

1. Splitting of water to 2H⁺ and [O] → Reduction of CO₂ → Absorption of light by Chlorophyll → Carbohydrate formation

2. Splitting of water to 2H⁺ and [O] → Absorption of light by Chlorophyll → Reduction of CO₂ → Carbohydrate formation

3. Absorption of light by chlorophyll → Splitting of water to 2H⁺ and [O] → Reduction of CO₂ → Carbohydrate formation

4. Absorption of light by Chlorophyll → Reduction of CO₂ → Splitting of water to 2H⁺ and [O] → Carbohydrate formation

Q.

The dark reaction or Calvin-Benson cycle:

1. Converts water into oxygen to generate ATP

2. Fixes carbon dioxide to make glucose

3. Fixes water to make glucose

4. Fixes water to make light