Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 85

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Weekly Quiz Competition

Question 1
1 / -0

Which group of plant are not benefited by $$CO_2$$ fertilisation effect?

A
Plant requiring 3 ATP per $$CO_2$$ fixation

B
Plant with kranz anatomy

C
Plant having high rate of photorespiration

D
Plant having single carboxylation

Solution

CO$$_{2}$$ fertilization refers to the increase in the concentration of the carbon dioxide due to the anthropogenic activities. The plants that perform the C$$_{3}$$ cycle are benefitted by this process as increase in CO$$_{2}$$ will not allow the oxygen to combine with the enzyme RuBisCo and so, the wasteful process of the photorespiration could be avoided. The C$$_{4}$$ plants already have the mechanism to use the maximum CO$$_{2}$$ because of the Kranz anatomy, hence they will not be benefited. The C$$_{3}$$ plants use 3ATP per CO$$_{2}$$ fixation and the C$$_{4}$$ plants use 5ATP per CO$$_{2}$$ fixation.
Hence, the correct answer is 'Plant with Kranz anatomy'
Question 2
1 / -0

Number of cell organelles involved in photorespiration are

A
One

B
Two

C
Three

D
Four

Solution

Photorespiration is a process in which the enzyme RuBisCO oxygenates RuBP, causing some of the energy produced by photosynthesis to be wasted. Photorespiration involves a complex network of enzyme reactions that exchange metabolites between chloroplasts, leaf peroxisomes, and mitochondria.
So, the correct option is 'Three'.
Question 3
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Which one respiratory complex is coupled with ETS for ATP synthesis?

A
Complex I

B
Complex III

C
Complex IV

D
Complex V

Solution

ATP synthase is also called complex V. It is the final enzyme in the oxidative phosphorylation pathway and utilizes the energy stored in a proton gradient across a membrane to drive the synthesis of ATP from ADP and phosphate (Pi).
So, the correct option is 'Complex V'.
Question 4
1 / -0

Dark reaction involves utilisation of $$CO_2$$ in producing $$C_6H_12O_6(Glucose)$$. Why is this phase called dark reaction?

A
The dark reaction is not dependent on light

B
It occurs simultaneously with the light reaction

C
In this process, ATP and NADP molecules formed in light reaction enter in to dark reaction

D
All of the above.

Solution

Light reactions need light to produce organic energy molecules (ATP and NADPH). They are initiated by colored pigments, mainly green colored chlorophylls. Dark reactions make use of these organic energy molecules(ATP and NADPH). This reaction cycle is also called Calvis Benison cycle, and it occurs in the stoma.
So, the correct option is 'The dark reaction is not dependent on light'.
Question 5
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During phenomenon of photorespiration the oxygen consuming steps occurs at

A
Chloroplast and mitochondria

B
Mitochondria and peroxisome

C
Peroxisome and chloroplast

D
Only chloroplast

Solution

The initial oxygenation reaction by RuBiSCO occurs in the chloroplast. This is where O$$_{2}$$ is consumed by photorespiration. The 2-phosphoglycolate that is formed is dephosphorylated and exported as glycolate to the peroxisome. The glycolate is then converted to glyoxylate. This reaction consumes O$$_{2}$$ and generates hydrogen peroxide.
So, the correct option is 'Peroxisome and chloroplast'.
Question 6
1 / -0

In $$C_4$$ plants additional ATP.s consumed in

A
Reduction of PGA

B
Regeneration of RUBP

C
Regeneration of PEP

D
Regeneration of OAA

Solution

In C4 plants, during the reduction step, NADPH donates electrons to a 3-carbon intermediate to make G3P. PGA is phosphorylated with ATP to 1,3-bisphosphoglycerate, this is subsequently reduced to G3P, with the electrons provided by NADPH for reduction.
Question 7
1 / -0

Amount of assimilatory power required to produce 2 molecules of sucrose in a $$C_4$$ plant is

A
30 ATPand 12 NADPH

B
60 ATP and 24 NADPH

C
36 ATP and 24 NADPH

D
120 ATP and 48 NADPH

Solution

As we know that for fixing of 1 CO$$_2$$ molecule in C$$_4$$ plants: 5ATPs and 2NAPDH molecules are required.
So, for formation of one molecule of sucrose(C$$_1$$$$_2$$H$$_2$$$$_2$$O$$_1$$$$_1$$) which consist of 12 Carbon atoms- 12 CO$$_2$$ molecules are needed to be fixed. So, number of ATP and NADPH required are 60 and 24 respectively.
For formation of 2 molecules of sucrose in C$$_4$$ plants 60 x 2 ATP and 24 x 2 NADPH will be required.
So, the correct answer is '120 ATP and 48 NADPH'.
Question 8
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Select correct statement

A
Each photosystem has all the pigments except one molecule of chlorophyll a

B
Action spectra is greater in blue and red light

C
Chlorophyll a & b are only pigments associated with photosynthesis

D
$$PS II$$ is involved in evolution of $$O_2$$

Solution

Chlorophyll a is the only primary pigment for photosynthesis in plants, but the range of light absorption is extended by chlorophyll-b, beta-carotene and other accessory pigments.
So, the correct option is 'Chlorophyll a & b are only pigments associated with photosynthesis'.
Question 9
1 / -0

Primary carboxylating enzyme in $$C_4$$ plant is found in __________________.

A
Chloroplast of mesophyll cells

B
Cytoplasm of mesophyll cell

C
chloroplast of bundle sheath cells

D
Cytoplasm of bundle sheath cells

Solution

Primary carboxylating enzyme in $$ { C }_{ 4 }$$ plant is found in Chloroplast of mesophyll cell. In $${ C }_{ 4 }$$ plants, initial fixation of carbon dioxide occurs in mesophyll cells. PEP is the primary acceptor of carbon dioxide which combines with carbon dioxide in the presence of PEPcase to form oxaloacetate.
Question 10
1 / -0

Why does the total amount of $$CO_2$$ in the atmosphere remains constant even though respiration liberates $$CO_2$$?

A
$$CO_2$$ acts as a buffer

B
$$CO_2$$ is converted to carbohydrates in photosynthesis

C
$$CO_2$$ forms carbonic acid

D
$$CO_2$$ undergoes cleavage during photosynthesis.

Solution

Most organisms release or exhale $$CO_2$$ during respiration. This $$CO_2$$ present in the environment is utilized by plants in the process of photosynthesis with the final product being a carbohydrate. This is how the amount of $$CO_2$$ in the atmosphere is kept under check.
So, the correct answer is '$$CO_2$$ is converted to carbohydrates in photosynthesis'.

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Photosynthesis in Higher Plants Test - 85

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Photosynthesis in Higher Plants Test - 85

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SHARING IS CARING

Question 1

Plant requiring 3 ATP per $$CO_2$$ fixation

Plant with kranz anatomy

Plant having high rate of photorespiration

Plant having single carboxylation

Solution

Question 2

One

Two

Three

Four

Solution

Question 3

Complex I

Complex III

Complex IV

Complex V

Solution

Question 4

The dark reaction is not dependent on light

It occurs simultaneously with the light reaction

In this process, ATP and NADP molecules formed in light reaction enter in to dark reaction

All of the above.

Solution

Question 5

Chloroplast and mitochondria

Mitochondria and peroxisome

Peroxisome and chloroplast

Only chloroplast

Solution

Question 6

Reduction of PGA

Regeneration of RUBP

Regeneration of PEP

Regeneration of OAA

Solution

Question 7

30 ATPand 12 NADPH

60 ATP and 24 NADPH

36 ATP and 24 NADPH

120 ATP and 48 NADPH

Solution

Question 8

Each photosystem has all the pigments except one molecule of chlorophyll a

Action spectra is greater in blue and red light

Chlorophyll a & b are only pigments associated with photosynthesis

$$PS II$$ is involved in evolution of $$O_2$$

Solution

Question 9

Chloroplast of mesophyll cells

Cytoplasm of mesophyll cell

chloroplast of bundle sheath cells

Cytoplasm of bundle sheath cells

Solution

Question 10

$$CO_2$$ acts as a buffer

$$CO_2$$ is converted to carbohydrates in photosynthesis

$$CO_2$$ forms carbonic acid

$$CO_2$$ undergoes cleavage during photosynthesis.

Solution

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