Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 38

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Weekly Quiz Competition

Question 1
1 / -0

Which enzyme is most abundantly found on earth?

A
Rubisco

B
Nitrogenase

C
Invertase

D
Catalase

Solution

Rubisco is the critical enzyme that catalyzes the addition of CO$$_2$$ to ribulose- 1, 5- bisphosphate during the Calvin cycle. It is the most abundant enzyme on earth.
So, the correct answer is option A.
Question 2
1 / -0

Chloroplasts are considered as self-replicating units since they contain

A
DNA.

B
RNA.

C
Both DNA and Ribosomes.

D
Neither DNA or RNA.

Solution

Chloroplasts contain their own genetic material as DNA and ribosomes. The plastid DNA possess genes which produce the proteins necessary for the functioning of plastids. They can self-replicate and form more copies of them. So, the correct answer is option C.
Question 3
1 / -0

A specific function of light energy in the process of photosynthesis is to

A
Activate chlorophyll.

B
Split water.

C
Synthesis glucose.

D
Reduce CO$$_2$$.

Solution

Light reaction of the photosynthesis starts from the excitation of chlorophyll by a photon. When a photon of light energy falls on chlorophyll molecule, it gets excited and moves on to a higher level called excited singlet state. The electron gap in the photosystem is further filled by the process of photolysis.
So, the correct answer is option B.
Question 4
1 / -0

The pigment present universally in all green oxygenic autotrophic plants is

A
Chlorophyll a.

B
Chlorophyll b.

C
Chlorophyll c.

D
Chlorophyll d.

Solution

Chlorophylls are the green photosynthetic pigments present in all photosynthetic autotrophic organisms. There are about 10 types of chlorophylls. Chlorophyll a is found in all the oxygen evolving photosynthetic plants. It directly takes part in photochemical reaction hence known as the primary photosynthetic pigment. Hence option A is the correct answer.
Question 5
1 / -0

Where do the energy-capturing reactions of photosynthesis occur?

A
Plasma membrane

B
Cytoplasm

C
Stroma

D
Thyllakoids

Solution

A thylakoid is a membrane-bound compartment inside chloroplasts. They are the site of light-dependent reactions of photosynthesis. There are four major protein complexes in thylakoid membrane as photosystem II, cytochrome b6f complex, photosystem I and ATP synthase. These four complexes work together to ultimately create the energy products ATP and NADPH.
So, the correct answer is option D.
Question 6
1 / -0

A specific function of light in the process of photosynthesis is to

A
Activate chlorophyll.

B
Split water.

C
Synthesise glucose.

D
Reduce CO$$_2$$.

Solution

A specific function of light in the process of photosynthesis is to activate chlorophyll. When light energy is absorbed by a chlorophyll molecule its electrons gain energy and move to higher energy levels in the molecule (photoexcitation). Sufficient energy ionizes the molecule, with the electron being 'freed' leaving a positively charged chlorophyll ion. This is called photoionization.
In whole chloroplasts, each chlorophyll molecule is associated with an electron acceptor and an electron donor. These three molecules make up the core of a photosystem. Two electrons from a photoionized chlorophyll molecule are transferred to the electron acceptor. The positively charged chlorophyll ion then takes a pair of electrons from a neighbouring electron donor such as water.
So, the correct answer is option A.
Question 7
1 / -0

If alcohol is poured on a plant continuously for a long time, the plant might not be able to prepare food on its own since the alcohol

A
Absorbs all the food prepared by the plant.

B
Does not let the plant absorb carbon dioxide from the air.

C
Dissolves all the minerals present in the plant.

D
Dissolves chlorophyll present in the plant.

Solution

If alcohol is poured on a plant continuously for a long time, the plant could not prepare food on its own, the alcohol dissolves chlorophyll present in the plant. Chlorophyll is a pigment present in plants which help in absorbing sunlight required for photosynthesis. The destruction of the pigment causes failure in the absorption of sunlight. This causes yellowing and wilting of leaves.
So, the correct answer is option D.
Question 8
1 / -0

The most important function of chlorophyll is to

A
Absorb carbon dioxide from the atmosphere.

B
Absorb water and minerals from the soil.

C
Give green colour to the leaves.

D
Perform photosynthesis in the presence of sunlight.

Solution

Chlorophyll is mainly present in the thylakoids of the chloroplast. It helps to absorb light and transfer that light energy by resonance energy transfer to a specific chlorophyll pair in the reaction center of the photosystems. This sunlight absorbed helps in the process of photosynthesis.
So, the correct answer is option D.
Question 9
1 / -0

Which of the following is essential for the plants to help them in the formation of chlorophyll?

A
Calcuim

B
Magnesium

C
Potassium

D
Phosphorus

Solution

Magnesium is bound to the central atom of the porphyrin ring of the green plant pigment chlorophyll.
So, the correct answer is option B.
Question 10
1 / -0

What is known as the factory for the synthesis of sugar in autotrophic eukaryotes?

A
Chloroplast

B
Mitochondrion

C
Endoplasmic reticulum

D
Ribosome

Solution

Chloroplasts are the food producers of the cell. The organelles are only found in plant cells and some protists such as algae. Animal cells do not have chloroplasts. Chloroplasts work to convert light energy of the sun into sugars that can be used by cells. Mitochondria, endoplasmic reticulum, and ribosomes are not involved in the synthesis of sugar in autotrophic eukaryotes.
So, the correct answer is option A.

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Re-Attempt Weekly Quiz Competition

Photosynthesis in Higher Plants Test - 38

Result

Photosynthesis in Higher Plants Test - 38

Score

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Rank

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SHARING IS CARING

Question 1

Rubisco

Nitrogenase

Invertase

Catalase

Solution

Question 2

DNA.

RNA.

Both DNA and Ribosomes.

Neither DNA or RNA.

Solution

Question 3

Activate chlorophyll.

Split water.

Synthesis glucose.

Reduce CO$$_2$$.

Solution

Question 4

Chlorophyll a.

Chlorophyll b.

Chlorophyll c.

Chlorophyll d.

Solution

Question 5

Plasma membrane

Cytoplasm

Stroma

Thyllakoids

Solution

Question 6

Activate chlorophyll.

Split water.

Synthesise glucose.

Reduce CO$$_2$$.

Solution

Question 7

Absorbs all the food prepared by the plant.

Does not let the plant absorb carbon dioxide from the air.

Dissolves all the minerals present in the plant.

Dissolves chlorophyll present in the plant.

Solution

Question 8

Absorb carbon dioxide from the atmosphere.

Absorb water and minerals from the soil.

Give green colour to the leaves.

Perform photosynthesis in the presence of sunlight.

Solution

Question 9

Calcuim

Magnesium

Potassium

Phosphorus

Solution

Question 10

Chloroplast

Mitochondrion

Endoplasmic reticulum

Ribosome

Solution

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