Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 30

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Question 1
1 / -0

Algae and other submerged plants float in water during day time and sink at night, because

A
They become light due to food material accumulation.

B
They lose weight at night.

C
They become bouyant due to accumulation of $$O_{2}$$ as a result of photosynthesis.

D
None of the above.

Solution

Algae and other green plants carry out oxygenic photosynthesis during day time. In this process, oxygen is released as a byproduct, which makes the plant body buoyant allowing them to float on the surface.
Question 2
1 / -0

Percentage of chlorophyll in a normal chloroplast

A
5 - 10%

B
40 - 50 %

C
65 - 75%

D
90 - 95%

Solution

Chlorophyll is light harvesting pigments found in chloroplasts. The approx concentration of chlorophyll in a chloroplast is approx 30mM. The percentage of chlorophyll in a normal chloroplast is 5 to 10 percent.
So, the correct answer is option A.
Question 3
1 / -0

The process of photosynthesis takes place in

A
Roots only

B
Shoot only

C
All the cells of plant

D
Chorophyll containing cells only

Solution

The process of photosynthesis occurs in chlorophyll containing cells. The photosynthesis is carried out using light energy trapped by chlorophylls. The chlorophyll pigments maximally absorb red and blue lights. The basic structure of chlorophyll molecule is porphyrin system.
So, the correct answer is option D.
Question 4
1 / -0

What will be left, if chlorophyll is burnt?

A
Magnesium

B
Manganese

C
Iron

D
Sulphur

Solution

Chlorophylls are light harvesting pigments of green plants. They are cyclic tetrapyrroles in which one atom of magnesium is coordinated to the centre of cyclic tetrapyrrole head. If the chlorophyll molecule is burnt, the inorganic constituent magnesium will be left rest of the molecule being organic in nature will be oxidised into gaseous state.
Question 5
1 / -0

Which of the following proteins is most abundant on the earth?

A
Catalase

B
RuBisCO

C
Amylase

D
None of the above

Solution

The carbon dioxide acceptor in Calvin cycle is ribulose 1, 5 bisphosphate (RUBP). During the initial carboxylation phase of calvin cycle, six molecules of carbon dioxide combine with six molecules of RUBP to form twelve molecules of 3, Phosphoglyceric acid (3-PGA), which is the first stable product of the cycle. This reaction is catalyzed by the enzyme Ribulose bisphosphate carboxylase, usually referred to as RuBisCO. This enzyme is the most abundant protein on earth. It occurs in all the green parts of actively photosynthesizing plants.
Question 6
1 / -0

Which one of the following is precursor of protochlorophyll?

A
Acetyl COA

B
Succinyl COA

C
Oxlaoacetic acid

D
$$\alpha$$-ketoglutarate

Solution

The chlorophyll molecule is important for trapping of light in photosynthesis. The minerals magnesium and iron are an important requirement for their biosynthesis. The chlorophylls are synthesized as protochlorophyllide, which gets converted into chlorophyll on exposure to light. The succinyl-CoA, an intermediate of Krebs cycle and the amino acid glycine initiate the biosynthesis of chlorophyll a-first producing protochlorophyllide, then chlorophyllide A and ultimately chlorophyll A.
So, the correct answer is option B.
Question 7
1 / -0

Which of the following is excited during photosynthesis?

A
Chlorophyll

B
Oxygen

C
Carbon dioxide

D
Water

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 A.
Question 8
1 / -0

At the time of ionization of H$$_{2}$$O, which initially captures the electron

A
Chlorophyll

B
NADP

C
OH$$^-$$

D
Cytochrome

Solution

Photosynthesis is chemically a redox reaction in which carbon dioxide is reduced and water is oxidized. The water is lysed in presence of light. This process is called as photolysis. When water is lysed it gets oxidized by the loss of electrons, which are captured by chlorophyll molecule in photosystem II or PS II and oxygen is released as a by-product, whereas protons accumulate in the thylakoid lumen.
So, the correct answer is option A.
Question 9
1 / -0

Element which helps in electron transport in the process of photosynthesis is

A
Zinc

B
Molybdenum

C
Boron

D
Mangnese

Solution

During noncyclic electron flow the electron hole in P-680 is filled by electrons obtained by photolysis of water. As a result, there is an evolution of oxygen and the electron move through Mn-protein bound to PS II. In this transport $$Mn^{++}$$ is oxidised to $$Mn^{+++}$$ and then reduced to $$Mn^{++}$$ in a cyclic manner. The manganese thus transfers electrons from water to photosystem II and thus plays an important role in electron transport in the process of photosynthesis.
So, the correct answer is option D.
Question 10
1 / -0

Kranz type of anatomy is found in

A
$$C_4$$ plant

B
$$C_3$$ plant

C
Succulents

D
None of the above

Solution

Word "Kranz" means a ring or wreath and refers to the thick walled bundle sheath cells present around vascular bundles in the shape of a ring in $$C_4$$ plants. The bundle sheath cells have agranal chloroplast and fix carbon dioxide with the help of RuBisCO enzyme. The thin walled mesophyll cells carry out initial carbon dioxide fixation with the help of PEP carboxylase enzyme. This special arrangement of cells and presence of dimorphic chloroplasts helps in minimizing photorespiration in $$C_4$$ plants.

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Photosynthesis in Higher Plants Test - 30

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Photosynthesis in Higher Plants Test - 30

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Question 1

They become light due to food material accumulation.

They lose weight at night.

They become bouyant due to accumulation of $$O_{2}$$ as a result of photosynthesis.

None of the above.

Solution

Question 2

5 - 10%

40 - 50 %

65 - 75%

90 - 95%

Solution

Question 3

Roots only

Shoot only

All the cells of plant

Chorophyll containing cells only

Solution

Question 4

Magnesium

Manganese

Iron

Sulphur

Solution

Question 5

Catalase

RuBisCO

Amylase

None of the above

Solution

Question 6

Acetyl COA

Succinyl COA

Oxlaoacetic acid

$$\alpha$$-ketoglutarate

Solution

Question 7

Chlorophyll

Oxygen

Carbon dioxide

Water

Solution

Question 8

Chlorophyll

NADP

OH$$^-$$

Cytochrome

Solution

Question 9

Zinc

Molybdenum

Boron

Mangnese

Solution

Question 10

$$C_4$$ plant

$$C_3$$ plant

Succulents

None of the above

Solution

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