Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 68

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Weekly Quiz Competition

Question 1
1 / -0

Which photosynthetic pigment is called universal photosynthesis pigment?

A
Chlorophyll d

B
Chlorophyll c

C
Chlorophyll b

D
Chlorophyll a
Solution
- Chlorophyll a the green pigment common to all photosynthetic cells absorbs all wavelengths of visible light except green, which it reflects to be detected by our eyes.
- All photosynthetic organisms (plants, certain protistans, prochlorobacteria, and cyanobacteria) have chlorophyll a. Chlorophyll a absorbs its energy from the violet-blue and reddish, orange-red wavelengths, and little from the intermediate (green-yellow-orange) wavelengths.
So, the answer is 'Chlorophyll a'.
Question 2
1 / -0

Which of the following is not required for chemiosmotic process?

A
Proton gradient

B
Spliting of water

C
ATP synthase enzyme

D
Closed membrane system

Solution

A. Proton gradient is required because the breakdown of this gradient leads to release of energy.
B. Splitting of water is required which takes place on the inner side of the membrane and the protons that are produced, they accumulate within the lumen of the thyllakoids.
C. ATP synthase enzyme is required that allows diffusion of protons back across the membrane, this releases energy to activate ATPase enzyme which catalyses the formation of ATP.
D. Closed membrane system is not required. Only a membrane is required for the development of a proton gradient across the membrane of the thyllakoid and the proton accumulation is towards the inside of the membrane.
So, the correct answer is 'Closed membrane system'.
Question 3
1 / -0

The pigment present in plants is

A
Chlorophyll

B
Methylene blue

C
Both 'A' & 'B'

D
None of these

Solution

Pigments present in plants are chlorophyll, carotene and anthocyanins.
So, the correct option is A.
Question 4
1 / -0

Which one of the following is a $${ C }_{ 4 }$$ plant?

A
Papaya

B
Potato

C
Maize

D
Pea

Solution

C3 plants include most of the temperate crops and all the woody trees. Example: beans, rice, wheat, potatoes
C4 plants constitute crops growing in a hot and dry climate. These are mostly grasses and some shrubs. Example: maize, sugarcane, amaranth
So, the correct option is 'Maize'.
Question 5
1 / -0

To develop proton gradient in respiration the required energy come from the oxidation of

A
NADH

B
NADH and $${ H }_{ 2 }O$$

C
$${ O }_{ 2 }$$ and NADH

D
$${ O }_{ 2 }$$

Solution

The electron transport chain is a series of proteins and organic molecules found in the inner membrane of the mitochondria. Electrons are passed from one member of the transport chain to another in a series of redox reactions. Energy released in these reactions is captured as a proton gradient, which is then used to make ATP in a process called chemiosmosis. Together, the electron transport chain and chemiosmosis make up oxidative phosphorylation.
All of the electrons that enter the transport chain come from NADH and FADH_2 molecules produced during earlier stages of cellular respiration.
NADH is very good at donating electrons in redox reactions so it can transfer its electrons directly to complex I, turning back into $$NAD^+ $$.
FADH_2 is not as good at donating electrons as NADH so it cannot transfer its electrons to complex I. It feeds them into the transport chain through complex II, which does not pump protons across the membrane.
So the answer is 'NADH'.
Question 6
1 / -0

Energy required to develop proton gradient during respiration comes from

A
Oxidation process of $$NADH$$

B
Oxidation-reduction process of $$CO_2$$ and $$NADH$$ respectively

C
From heat energy developed during respiration

D
Oxidation-reduction process of $$NADPH$$ and $$O_2$$ respectively

Solution

When inside the mitochondria, pyruvate and fatty acids are broken down to acetyl CoA, which is then metabolized by the citric acid cycle. During the reaction, NAD$$^{+}$$ is reduced to NADH. In the process of oxidative phosphorylation, high-energy electrons from NADH are passed along the ETC in the inner membrane to O$$_{2}$$. This transport of electrons generates a proton gradient across the mitochondrial inner membrane, which drives the production of ATP by ATP synthase.
So, the correct option is 'Oxidation process of NADH'.
Question 7
1 / -0

Which option is not correct for chemiosmotic theory?

A
ATP synthesis is linked with proton gradient

B
Break down of proton gradient releases energy

C
ATPase enzyme act as pump to break proton gradient

D
It is applicable for photo phosphorylation and oxidative phosphorylation
Solution
- There is a proton gradient created across the thylakoid membrane. The breakdown of this gradient is important because it leads to the release of energy. The gradient is broken down due to the movement of protons across the membrane to the stroma through the transmembrane channel ADP ATP of the F0 of the ATPase.
- The ATPase enzyme consists of two parts: F0 and F1. This breakdown provides enough energy to cause a conformational change in the F1 particle of the ATPase, which makes the enzyme synthesize ATP.
So, the correct option is 'ATPase enzyme act as a pump to break proton gradient'.
Question 8
1 / -0

Which cell organelle is not related with photorespiration?

A
Mitochondria

B
Chloroplast

C
Glyoxysome

D
Peroxysome

Solution

Photorespiration is a metabolic pathway involving a complex network of enzyme reactions that exchange metabolites between chloroplasts, leaf peroxisomes, and mitochondria.
So the correct option is 'Glyoxysome'.
Question 9
1 / -0

Which statement is not correct with above graph?

A
Chlorophyll-a show greater absorption peak in blue light

B
Chlorophyll-a show greater absorption peak in red light

C
In red light chlorophyll-a have greater peace than chlorophyll-b

D
In blue light chlorophyll-b have greater peak than chlorophyll-a
Solution
Correct option: A

Explanation:
- Chlorophyll-a doesn't show greater absorption peak in blue light but it shows greater absorption peak in red light. Option A is incorrect.
- Chlorophyll-a absorbs light within the violet, blue and red wavelengths while mainly reflecting green.
- Based on their absorption levels, Chlorophyll-a have greater peak than other pigments in red wavelength. And in blue wavelength, Chlorophyll-b have greater peak than other pigments.
- The peak is maximum at the red light (long wavelength) because chlorophyll-a absorbs red light in larger amounts.
- So, the correct answer is 'Option A'
Question 10
1 / -0

Present atmospheric $$CO_2$$ concentration is not limiting factor for $$C_4$$ plants as $$C_4$$ plants

A
Posses PEPcase as primary carboxylase enzyme

B
Primary carboxylation reaction product is a four carbon acid

C
No oxygenation of RUBP due to kranz anatomy

D
Primary carboxylation reaction occurs in mesophyll cells

Solution

The $$C_4$$ plants posses PEPcase as primary carboxylase enzyme which carboxylates $$CO_2$$ that is absorbed from the stomata. In these plants there is a special mechanism, which was developed because they evolved at a time when the climate had low carbon dioxide levels, that converts carbon dioxide to malic acid which is stored and later used so they can keep their stomata closed during the daytime to prevent transpirational loss of water. Hence the concentration of $$CO_2$$ is not a limiting factor for them.
So the correct answer is ' Possess PEPcase as primary carboxylase enzyme'.

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Photosynthesis in Higher Plants Test - 68

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Photosynthesis in Higher Plants Test - 68

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SHARING IS CARING

Question 1

Chlorophyll d

Chlorophyll c

Chlorophyll b

Chlorophyll a

Solution

Question 2

Proton gradient

Spliting of water

ATP synthase enzyme

Closed membrane system

Solution

Question 3

Chlorophyll

Methylene blue

Both 'A' & 'B'

None of these

Solution

Question 4

Papaya

Potato

Maize

Pea

Solution

Question 5

NADH

NADH and $${ H }_{ 2 }O$$

$${ O }_{ 2 }$$ and NADH

$${ O }_{ 2 }$$

Solution

Question 6

Oxidation process of $$NADH$$

Oxidation-reduction process of $$CO_2$$ and $$NADH$$ respectively

From heat energy developed during respiration

Oxidation-reduction process of $$NADPH$$ and $$O_2$$ respectively

Solution

Question 7

ATP synthesis is linked with proton gradient

Break down of proton gradient releases energy

ATPase enzyme act as pump to break proton gradient

It is applicable for photo phosphorylation and oxidative phosphorylation

Solution

Question 8

Mitochondria

Chloroplast

Glyoxysome

Peroxysome

Solution

Question 9

Chlorophyll-a show greater absorption peak in blue light

Chlorophyll-a show greater absorption peak in red light

In red light chlorophyll-a have greater peace than chlorophyll-b

In blue light chlorophyll-b have greater peak than chlorophyll-a

Solution

Question 10

Posses PEPcase as primary carboxylase enzyme

Primary carboxylation reaction product is a four carbon acid

No oxygenation of RUBP due to kranz anatomy

Primary carboxylation reaction occurs in mesophyll cells

Solution

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