What Is Dark Reaction

Q.

How do desert plants perform photosynthesis?

Q.

Why is TCA cycle called amphibolic cycle?

Q.

Why is the colour of a leaf kept in the dark is yellow, or pale green? Which pigment do you think is more stable?

Q.

What are the 3 stages of cell cycle?

Q.

What are the three factors that control the cell cycle and cell division?

Q. How do relative concentration of the oxygen and co2 affect the activity of the rubisco?

Q. Glycolytic reversal is a part of _____.

1. Anaerobic respiration
2. Aerobic respiration
3. Light phase of photosynthesis
4. Dark phase of photosynthesis

Q.

Question 08
Dark reaction in photosynthesis is called so because
(a) it can occur in dark also
(b) it does not depend on light energy
(c) it cannot occur during day light
(d) it occurs more rapidly at night

Q.

Why is it important for light dependent reactions to separate water?

Q.

Question 26
Which products formed during the light reaction of photosynthesis are used to drive the dark reaction?

Q. Immediately after light becomes unavailable, the biosynthetic process

1. continues for some time and then stops
2. stops and starts again if the light is made available
3. stops permanently if the light is not made available in future
4. all of the above

Q. The primary function of the light-independent reaction in photosynthesis is

1. to provide food to plant in form of glucose
2. all of these
3. to produce carbon dioxide
4. to synthesize ATP and NADPH

Q. In a chloroplast, enzymatic reaction to synthesize sugar takes place in

1. stroma
2. ribosome
3. stroma lamellae
4. the lumen of the thylakoids

Q. In a plant cell, ATP is synthesised in

1. chloroplasts
2. nucleus
3. mitochondria
4. (a) and (b) above.

Q.

The green pigment that traps solar energy during photosynthesis is

1. Anthocyanin

2. Carotenoid

3. Haemoglobin

4. Chlorophyll

Q. To avoid photorespiration in $C_4$ plants, RuBisCo activity is restricted in the ___ of chloroplast.

Q. I. The most abundant enzyme in the world

II. Its active site can bind to both $C{O}_2$ and $O_2$ hence the name

III. Has a much greater affinity for $C{O}_2$ than $O_2$

IV. The relative conc. of $O_2$ and $C{O}_2$ determines which of the two will bind to the enzyme

V. It is present in all photosynthetic plants

VI. It is present in chloroplast

The above facts are characteristic of which enzyme?

1. PEPCase
2. RuBisCO
3. Hexokinase
4. Nitrogenase

Q. The enzyme which catalyses photosynthesis C4 cycle. RUBP carboxylase or PEP carboxylase

Q.

Question 30
Do reactions of photosynthesis called, as 'Dark Reaction' need light? Explain

Q.

Where is energy stored in a cell?

Q.

True or False Questions:

The oxidation of food in a cell takes place in mitochondria.

(A) True
(B) False

Q. Q. Why the C4 plants use the C3 pathway or the Calvin cycle as the main biosynthetic pathway ?

Q.

NADPH and ATP are used in the ______ reactions of photosynthesis.

1. light-independent

2. glycolytic

3. light-dependent

4. Krebs cycle

Q.

Name the following:

Stage of photosynthesis that does not need light.

Q. In photosynthesis energy from light reaction to dark reaction is transferred in the form of:

1. RuDP
2. Chlorophyll
3. ADP
4. ATP

Q. Which of the following is the correct match?

1. Amyloplasts - Store carbohydrates
2. Elaioplasts - Store fats and oils
3. Aleuroplasts - Store proteins
4. All of these

Q. Proteinaceous pigment which controls the activities concerned with light:

1. Carotenoids
2. Phytochrome
3. Chlorophyll
4. Anthocyanin

Q. RuBisCO enzyme is also called

1. Carboxy phosphatase
2. Carboxy dismutase
3. Carboxy hydrolase
4. Carboxy peptidase

Q. Which of the following products from light dependent reaction is used as a source of energy in the light independent reactions?

1. NADPH
2. Oxygen
3. ADP
4. Glucose

Q. The biosynthetic reaction of photosynthesis takes place in

1. mitochondria
2. stroma of chloroplast
3. thylakoids
4. cytoplasm