Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 11

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Question 1
1 / -0

Photosynthesis is a/an

A
Reduction reaction.

B
Oxidation reaction.

C
Oxidation-reduction reaction.

D
None of the above.

Solution

Photosynthesis is the process in which autotrophs such as green plants use carbon dioxide and water in presence of sunlight to synthesize nutrients such carbohydrates in the form of glucose and release oxygen. In this carbon dioxide is reduced to glucose and water is oxidized to release oxygen. Hence the reaction is an oxidation-reduction reaction. Thus the correct answer is option C.
Question 2
1 / -0

Among various nutrients .................. has a direct relationship with photosynthesis.

A
Nitrogen

B
Magnesium

C
Manganese

D
Iron
Solution
- There are different micro and macro nutrients required for the growth and development of the plants.
- Nitrogen is considered as one of the most important nutrients for the growth. Nitrogen is also involved in the process of photosynthesis.
- The nitrogen is present in the porphyrin rings of the chlorophyll pigment. There are many enzymes which are involved in the reactions of photosynthesis.
- These enzymes contain nitrogen. Deficiency of nitrogen results in decrease in the rate of photosynthesis.
- Thus, the correct answer is option A.
Question 3
1 / -0

The empirical formula of chlorophyll a is

A
$$C_{55}H_{72}O_5N_4$$$$Mg$$

B
$$C_{55}H_{70}O_6N_4$$$$Mg$$

C
$$C_{55}H_{72}O_5N_4$$$$Fe$$

D
$$C_{55}H_{72}O_4N_5$$$$Mg$$

Solution

Chlorophyll pigments trap sunlight during the process of photosynthesis. The chlorophylls are cyclic tetrapyrrole structures having a porphyrin head and a long phytol tail attached to the head. One atom of magnesium is coordinated to the cyclic tetrapyrrole head.
Empirical formula of Chlorophyll a is C$$_{55}$$H$$_{72}$$O$$_5$$N$$_4$$Mg and that of chlorophyll b is C$$_{55}$$H$$_{70}$$O$$_6$$N$$_4$$Mg.
Thus, the correct answer is option A.
Question 4
1 / -0

The overall process of photosynthesis involves using sunlight in the conversion of carbon dioxide and water into which products?

A
ATP and oxygen

B
Oxygen and carbon

C
ATP and sugars

D
Sugars and proteins

E
Sugars and oxygen

Solution

Green plants capture solar energy and convert it into chemical energy by the process known as photosynthesis. It is an anabolic process of manufacturing of organic compounds. It is characterized by reduction of CO₂ and oxidation of water. During photosynthesis, carbon dioxide and water are transformed into simple carbohydrates and oxygen is liberated into the atmosphere.
So, the correct answer is Sugars and oxygen.
Question 5
1 / -0

The green pigment found in the chloroplast of a plant cell is

A
Enzymes

B
Glucose

C
Chlorophyll

D
None of these

Solution

Chlorophyll are the most important and abundant active pigments of photosynthesis found in the chloroplast of plant cell. They are green in color, are insoluble in water and soluble in organic solvents. Thus option C is the correct answer.
Question 6
1 / -0

The empirical formula for chlorophyll a is

A
$$C_{35}H_{72}O_5N_4Mg$$

B
$$C_{65}H_{70}O_6N_4Mg$$

C
$$C_{55}H_{72}O_5N_4Mg$$

D
$$C_{45}H_{70}O_6N_4Mg$$

Solution

Photosynthesis takes place in the green leaves of plants and other green parts of plants like stem etc. The most active photosynthetic tissue in higher plants is the mesophyll of leaves. Mesophyll cells have many chloroplasts, which contain the specialized light-absorbing green pigments, the chlorophylls. When chlorophyll absorbs light, it gets excited and emits electrons. Chlorophyll a is the primary photosynthetic pigment. It shows bright or blue-green colour in the chromatogram. Chlorophyll a is directly involved in the light reaction of photosynthesis. It is present in the reaction centres of Photosystem I and Photosystem II which absorbs light energy of longer wavelength. These centres can release electron upon absorption of energy. A chemical formula which shows the simplest ratio of elements in a compound rather than the total number of atoms in the molecule is known as empirical formula. The empirical formula of chlorophyll a is $$C_{55}H_{72}O_{5}N_{4}Mg$$.
Question 7
1 / -0

Chlorophyll a occurs in

A
All photosynthetic autotrophs

B
In all higher plants

C
All oxygen liberating autotrophs

D
All plants except fungi

Solution

Photosynthesis takes place in the green leaves of plants and another green part of plants like stem etc. The most active photosynthetic tissue in higher plants is the mesophyll of leaves. Mesophyll cells have many chloroplasts, which contain the specialized light-absorbing green pigments, the chlorophylls. When chlorophyll absorbs light, it gets excited and emits electrons. Chlorophyll a is the primary photosynthetic pigment. It shows bright or blue-green colour in the chromatogram. Chlorophyll a is directly involved in the light reaction of photosynthesis. Chlorophyll a occurs in all oxygen liberating autotrophs. It is a universal photosynthetic pigment. It is present in the reaction centres of Photosystem I and Photosystem II which absorbs light energy of longer wavelength. These centres can release electron upon absorption of energy.
Question 8
1 / -0

Photorespiration is affected by

A
Temperature

B
Light intensity

C
$$CO_2$$ and $$O_2$$

D
All of the above

Solution

Photorespiration is the process in which the RuBisCO binds with the oxygen instead of carbon dioxide due to the increase in its concentration. It is specifically seen in plants that grow in the temperate region and is also affected by the intensity of light given.
So the correct option is 'All of the above'.
Question 9
1 / -0

Photophosphorylation means synthesis of

A
ATP from ADP

B
NADP

C
ADP from ATP

D
PGA

Solution

Photophosphorylation is the process in which light energy is converted into chemical energy through the production of ATP. The process of reduction of $$NADP$$ into $$NADP + H^{+}$$ may be denoted as electron transport system (ETS). It is the process of formation of ATP from ADP and inorganic phosphate (ip) utilizing light energy. The flow of electrons through ETS is linked to photophosphorylation. Electron transport chain is a series of electron carriers over which electrons pass in a downhill journey releasing energy at every step that is used in generating an electrochemical proton gradient which helps in synthesizing ATP. Based on the path of electrons, associated photophosphorylation can be identified as non-cyclic and cyclic phosphorylation.
Question 10
1 / -0

ATP formation during photosynthesis is

A
Phosphorylation

B
Photophosphorylation

C
Oxidative phosphorylation

D
None of the above

Solution

Photophosphorylation is the process in which light energy is converted into chemical energy through the production of ATP. The process of reduction of $$NADP$$ into $$NADP + H^{+}$$ may be denoted as electron transport system (ETS). It is the process of formation of ATP from ADP and inorganic phosphate (ip) utilizing light energy. The flow of electrons through ETS is linked to photophosphorylation. Electron transport chain is a series of electron carriers over which electrons pass in a downhill journey releasing energy at every step that is used in generating an electrochemical proton gradient which helps in synthesizing ATP. Based on the path of electrons, associated photophosphorylation can be identified as non-cyclic and cyclic phosphorylation.

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Photosynthesis in Higher Plants Test - 11

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Question 1

Reduction reaction.

Oxidation reaction.

Oxidation-reduction reaction.

None of the above.

Solution

Question 2

Nitrogen

Magnesium

Manganese

Iron

Solution

Question 3

$$C_{55}H_{72}O_5N_4$$$$Mg$$

$$C_{55}H_{70}O_6N_4$$$$Mg$$

$$C_{55}H_{72}O_5N_4$$$$Fe$$

$$C_{55}H_{72}O_4N_5$$$$Mg$$

Solution

Question 4

ATP and oxygen

Oxygen and carbon

ATP and sugars

Sugars and proteins

Sugars and oxygen

Solution

Question 5

Enzymes

Glucose

Chlorophyll

None of these

Solution

Question 6

$$C_{35}H_{72}O_5N_4Mg$$

$$C_{65}H_{70}O_6N_4Mg$$

$$C_{55}H_{72}O_5N_4Mg$$

$$C_{45}H_{70}O_6N_4Mg$$

Solution

Question 7

All photosynthetic autotrophs

In all higher plants

All oxygen liberating autotrophs

All plants except fungi

Solution

Question 8

Temperature

Light intensity

$$CO_2$$ and $$O_2$$

All of the above

Solution

Question 9

ATP from ADP

NADP

ADP from ATP

PGA

Solution

Question 10

Phosphorylation

Photophosphorylation

Oxidative phosphorylation

None of the above

Solution

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