Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 37

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Question 1
1 / -0

Dark reaction and light reaction of photosynthesis takes place in the

A
Stroma and grana of chloroplast respectively

B
Grana and stroma of chloroplast respectively

C
Grana only

D
Stroma only
Solution
- Photosynthesis takes place in two major steps, light reaction, and dark reaction.
- Carbon-fixing during the dark reaction (light-independent process) takes place in the stroma of the chloroplast.
- The light reactions of photosynthesis occur in the thylakoids of grana present in the chloroplast.
So, the correct answer is option A.
Question 2
1 / -0

The green pigment present in the plants which help in the synthesis of food is

A
Chlorophyll

B
Keratin

C
Serotonin

D
Haemoglobin
Question 3
1 / -0

Which of the following reaction takes place inside stroma of chloroplasts where light energy is not captured?

A
Light

B
Both dark and light

C
Krebs

D
Dark

Solution

Photosynthesis is divided into two sets of reactions: the light-dependent (light) reactions and the light-independent (dark) reactions. The light reactions, which convert the energy in light into chemical energy, take place within the thylakoid membranes of the chloroplasts, whereas the dark reactions, which use that chemical energy to fix $$CO_2$$ into organic molecules, take place in the stroma of the chloroplast.
Question 4
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Most of the photosynthesis is carried out by the

A
Trees.

B
Creepers.

C
Herbs.

D
Algae present in the ocean.

Solution

Most of the photosynthesis is carried out by the algae of the ocean. Algae are aquatic, plant-like organisms. These account for about 60% of the world's photosynthesis, and possibly, even more, depending on different estimates. They're essentially the base of all life on earth. So, the correct answer is option D.
Question 5
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The first stable compound in the C$$_3$$ cycle is

A
Phosphoglyceraldehyde.

B
Phosphoglyceric acid.

C
Fructose - 1 - 6 diphosphate.

D
Glucose - 6 - phosphate.

Solution

The first stable compound in Calvin cycle is a 3 carbon compound namely 3 phosphoglyceric acid (PGA). Hence the Calvin cycle is also called as C$$_3$$ cycle.
Question 6
1 / -0

The assimilatory power in photosynthesis is

A
ATP

B
NADPH

C
ATP and NADPH$$_2$$

D
ATP, NADPH and CO$$_2$$

Solution

Photosynthesis is an important physiological process that takes place in the chloroplast of the green plants wherein sugar is synthesized from water and carbon dioxide in the presence of light. This is also referred to as carbon assimilation reaction as this oxidation- reduction process involves a light reaction and dark reaction where water is oxidized and CO$${_2}$$ is reduced to carbohydrates. In light reaction, ATP and NADPH$${_2}$$ are produced and in the dark reaction, CO$${_2}$$ is reduced with the help of ATP and NADPH$${_2}$$ to produce glucose.
So, the correct answer is 'ATP and NADP$$H_2$$
Question 7
1 / -0

Young fruits are green but develop brilliant shade of colour towards ripening because

A
Amount of sugar increases in them.

B
Amount of organic acids decreases in them.

C
Chloroplasts are degraded to carotenes and xanthophylls.

D
Of ageing.

Solution

The time of ripening of fruits differs and the process is characterized by the change in color, aroma, texture and even metabolism. However, the ripening can be assigned due to degradative or synthetic reasons and in case of young green fruits that develop a brilliant shade of color towards the ripening stage can be attributed to the decrease in the chlorophyll content and increase in the carotenoids content by destruction of chloroplasts, breakdown of chlorophyll, formation of carotenoids and anthocyanins and xanthophyll.
So, the correct answer is option C.
Question 8
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The primary acceptor during CO$$_2$$ fixation in the C$$_3$$ plants is

A
Ribulose biphosphate.

B
Glycolate.

C
Phosphoenolpyruvate.

D
Triose phosphate.

Solution

The dark reaction of the photosynthesis takes place mainly in the stroma of the chloroplast. C$$_3$$ carbon fixation is one of three metabolic pathways for carbon fixation in photosynthesis, along with C$$_4$$ and CAM. This process converts carbon dioxide and ribulose bisphosphate (RuBP, a 5-carbon sugar) into 3-phosphoglycerate through the following reaction:
CO$$_2$$ + RuBP → (2) 3- phosphoglycerate
This reaction occurs in all plants as the first step of the Calvin-Benson cycle.
So, the correct answer is option A.
Question 9
1 / -0

Which of the following statement is correct ?

A
Plants carry on photosynthesis all the time

B
Plants carry on photosynthesis during the night and respiration during the day

C
Plants carry on photosynthesis during the day and respiration all the time

D
Plants carry on respiration and photosynthesis all the time
Solution
- Plants respire all the time, whether it is dark or light. Respiration uses oxygen and produces carbon dioxide. Plants respire all the time because their cells need the energy to stay alive.
- Photosynthesis is a process used by plants and other organisms to convert light energy, normally from the sun, into chemical energy that can be later released to fuel the activities of the organism. This chemical energy is stored in form of Glucose which may be used in the respiration process.
So, the correct answer is option C.
Question 10
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Dark reaction, in photosynthesis is called so because

A
It does not require light energy.

B
It can not occur during daytime.

C
It occurs more rapidly at night.

D
It can also occur in darkness.

Solution

Dark reactions do not need light. Instead, dark reaction uses ATP and NADPH to produce energy molecules. No photosystem is required. Photolysis of water does not occur. So, the dark reaction in photosynthesis is called so because it does not require light energy.

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Re-Attempt Weekly Quiz Competition

Photosynthesis in Higher Plants Test - 37

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Photosynthesis in Higher Plants Test - 37

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SHARING IS CARING

Question 1

Stroma and grana of chloroplast respectively

Grana and stroma of chloroplast respectively

Grana only

Stroma only

Solution

Question 2

Chlorophyll

Keratin

Serotonin

Haemoglobin

Question 3

Light

Both dark and light

Krebs

Dark

Solution

Question 4

Trees.

Creepers.

Herbs.

Algae present in the ocean.

Solution

Question 5

Phosphoglyceraldehyde.

Phosphoglyceric acid.

Fructose - 1 - 6 diphosphate.

Glucose - 6 - phosphate.

Solution

Question 6

ATP

NADPH

ATP and NADPH$$_2$$

ATP, NADPH and CO$$_2$$

Solution

Question 7

Amount of sugar increases in them.

Amount of organic acids decreases in them.

Chloroplasts are degraded to carotenes and xanthophylls.

Of ageing.

Solution

Question 8

Ribulose biphosphate.

Glycolate.

Phosphoenolpyruvate.

Triose phosphate.

Solution

Question 9

Plants carry on photosynthesis all the time

Plants carry on photosynthesis during the night and respiration during the day

Plants carry on photosynthesis during the day and respiration all the time

Plants carry on respiration and photosynthesis all the time

Solution

Question 10

It does not require light energy.

It can not occur during daytime.

It occurs more rapidly at night.

It can also occur in darkness.

Solution

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