Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

85 - 90% of all photosynthesis of the world is carried out by

A
Shrubs

B
Herbs

C
Oceanic algae / phytoplanktons

D
Tree with large branches

Solution

90% of total photosynthesis is carried out by aquatic plants. Most of them are marine algae, which accounts for nearly 80%. The rest is produced by freshwater algae for about 10%. Only the remaining 10% of total photosynthesis is performed by land plants.
So, the correct answer is option C.
Question 2
1 / -0

Photosynthesis is a

A
Exothermic process

B
Exergonic process

C
Anabolic process

D
Catabolic process

Solution

Anabolism is the set of metabolic pathways, that construct molecule from smaller units. In the case of photosynthesis, smaller molecules are used to make larger glucose units. In photosynthesis, the carbon dioxide and water are used to produce glucose in presence of light.
Photophosphorylation takes place which mainly helps in the formation of ATP from ADP. It is also counted as an anabolic pathway.
So, the correct answer is option C.
Question 3
1 / -0

Solarization is

A
Formation of chlorophyll

B
Destruction of chlorophyll

C
Utilisation of sunlight

D
Effect of solar light

Solution

Solarization is the destruction of chlorophyll molecules. It is prevented by carotenoids. C$$_3$$ plants may not have the necessary amount of carotenoids and hence, due to solarization, their chlorophyll molecules get destroyed.
So, the correct answer is option B.
Question 4
1 / -0

The specific function of light energy in the process of photosynthesis is to:

A
Activate chlorophyll

B
Split water

C
Reduce carbon dioxide

D
Synthesize glucose

Solution

In the light-dependent reactions, one molecule of the pigment chlorophyll absorbs one photon and loses one electron. This electron is passed to a modified form of chlorophyll called pheophytin, which passes the electron to a quinone molecule, allowing the start of a flow of electrons down an electron transport chain that leads to the ultimate reduction of NADP to NADPH. In addition, this creates a proton gradient across the chloroplast membrane; its dissipation is used by ATP synthase for the concomitant synthesis of ATP.
So, the correct answer is option A.
Question 5
1 / -0

Which group is not alike?

A
Enzyme and protein synthesis

B
Osmosis and diffusion

C
Photosynthesis and respiration

D
Growth and movement

Solution

Photosynthesis and respiration are opposite processes where oxygen is liberated and CO$$_2$$ is absorbed in the former and CO$$_2$$ is liberated and O$$_2$$ is absorbed. The two process are helpful in balancing the oxygen and carbon dioxide concentration in the atmosphere.
So, the correct answer is option C.
Question 6
1 / -0

The use of solar cooker by man is copying of which one by the following processes?

A
Photosynthesis

B
Respiration

C
Guttation

D
Photorespiration
Solution
- The use of solar cookers by man is copying of photosynthesis where the raw materials are used to form cooked food in the presence of sunlight.
- As the light is trapped by the accessory pigments and chlorophyll present in the thylakoids, similarly the light is trapped by the photovoltaic cell present in the solar panel of the solar cookers.
So, the correct answer is option A.
Question 7
1 / -0

$$CO_{2}$$ joins the photosynthetic pathway during:

A
Light reaction

B
Dark reaction

C
Photosystem- I

D
Photosystem- II
Solution
- Dark reaction is the second phase of photosynthesis. It is purely enzymatic and slower than the photochemical reaction (light reaction).
- It takes place in the stroma region of the chloroplast and is independent of light. It can occur either in the presence or in the absence of light provided that the assimilatory power is available.
- During the dark reaction, ATP and NADPH (products of light reaction) are utilized to fix CO$$_2$$, which is further used to produce carbohydrates.
So, the correct answer is option B.
Question 8
1 / -0

Which of the following statement about photosynthesis is false?

A
The electron carriers involved in photophosphorylation are located on the thylakoid membranes.

B
Photosynthesis is a redox process in which water is oxidised and carbon dioxide is reduced.

C
The enzymes required for carbon fixation are located only in the grana of chloroplast.

D
In green plants, both PS-I and PS-II are required for the formation of NADPH + H$$^{+}$$.

Solution

Ribulose-1,5-bisphosphate carboxylase/oxygenase, commonly known by the abbreviation RuBisCO. RuBisCO is the enzyme for carbon fixation and it is located in the stroma of the chloroplast.
So, the correct answer is option C.
Question 9
1 / -0

The basic structure of all chlorophyll comprises of

A
Porphyrin system

B
Cytochrome system

C
Plastocyanin system

D
Flavoproteins only

Solution

Porphyrins are a group of heterocyclic macrocycle organic compounds, composed of four modified pyrrole subunits interconnected at their alpha carbon atoms via methine bridges.
So, the correct answer is option A.
Question 10
1 / -0

NADP is converted into NADPH$$_{2}$$ in

A
Photosystem- I

B
Non- cyclic photophosphorylation

C
Calvin cycle

D
Photosystem- II
Solution
- Noncyclic photophosphorylation results in the production of $$NADPH_2$$ and involves both photosystems I and II.
- These two photosystems work in series, first PS II and the PS I. The two photosystems are connected through an electron transport chain. Both $$ATP$$ and $$NADPH_2$$ are synthesized by this kind of electron flow.
- First, in PS II, the P$$_680$$ molecule absorbs 680 nm wavelength of red light causing electrons to become excited and jump into an orbit that is farther from the atomic nucleus.
- These electrons are picked up by an electron acceptor which passes them to an electron transport system of cytochromes. This movement of electrons is downhill on the redox potential scale.
- The electrons are then passed onto the pigments of PS I, without being used as they pass through the electron transport chain. Simultaneously, electrons in the reaction center of PS I (P $$_700$$) are excited when they receive light of wavelength 700 nm, and these electrons are transferred to another acceptor molecule that has a greater redox potential. These electrons are then moved downhill again to a molecule of NADP $$^+$$. The addition of these electrons reduces the NADP $$^+$$ to NADPH$$_2$$.
So, the correct answer is option B.

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Re-Attempt Weekly Quiz Competition

Photosynthesis in Higher Plants Test - 16

Result

Photosynthesis in Higher Plants Test - 16

Score

-

Rank

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SHARING IS CARING

Question 1

Shrubs

Herbs

Oceanic algae / phytoplanktons

Tree with large branches

Solution

Question 2

Exothermic process

Exergonic process

Anabolic process

Catabolic process

Solution

Question 3

Formation of chlorophyll

Destruction of chlorophyll

Utilisation of sunlight

Effect of solar light

Solution

Question 4

Activate chlorophyll

Split water

Reduce carbon dioxide

Synthesize glucose

Solution

Question 5

Enzyme and protein synthesis

Osmosis and diffusion

Photosynthesis and respiration

Growth and movement

Solution

Question 6

Photosynthesis

Respiration

Guttation

Photorespiration

Solution

Question 7

Light reaction

Dark reaction

Photosystem- I

Photosystem- II

Solution

Question 8

The electron carriers involved in photophosphorylation are located on the thylakoid membranes.

Photosynthesis is a redox process in which water is oxidised and carbon dioxide is reduced.

The enzymes required for carbon fixation are located only in the grana of chloroplast.

In green plants, both PS-I and PS-II are required for the formation of NADPH + H$$^{+}$$.

Solution

Question 9

Porphyrin system

Cytochrome system

Plastocyanin system

Flavoproteins only

Solution

Question 10

Photosystem- I

Non- cyclic photophosphorylation

Calvin cycle

Photosystem- II

Solution

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