Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 81

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Question 1
1 / -0

CAM plants do not show photorespiration as they

A
Keep stomata closed during day time

B
Use PEP carboxylase

C
Fix $$CO_2$$ into organic acid during the night and release $$CO_2$$ during the day

D
Perform Calvin cycle at night

Solution

A) CAM plants have scotoactive stomata that fix carbon dioxide at night and form sugars during the day. They are closed during the day and are open at night, but this does not play a role in photorespiration.
B) Photorespiration does not occur in CAM plants because they use PEP Carboxylase instead of RUBISCO for the absorption of carbon dioxide.
C) CAM plants fix carbon dioxide during the dark and synthesis of organic acids from it. But this does not prevent photorespiration.
D) CAM plants perform Calvin cycle at night but this does not prevent photorespiration.
So the correct answer is 'Use PEP carboxylase'.
Question 2
1 / -0

The creation of proton gradient across thylakoid membrane is a result of

A
Decrease in proton number in stroma

B
Decrease in pH in the lumen

C
Accumulation of protons in the lumen

D
All of the above

Solution

The creation of proton gradient across thylakoid membrane is a result of the accumulation of protons on the inner side of the lumen and decrease in protons in the stroma. It also result due to decrease in pH on the lumen side of the thylakoid membrane.
Thus, the correct answer is 'All of the above.'
Question 3
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Photosynthetic autotrophs receive energy from

A
Inorganic chemicals

B
Organic chemicals

C
Heat

D
Light

Solution

A.Correct option-D
B.Explanation for correct option

A) A type of chemosynthetic autotrophs called chemolithotrophs like methanogenic archaebacteria make food using energy from inorganic chemical reactions, often combining hydrogen sulfide or methane with oxygen.
B) Chemoorganotrophs a type of chemosynthetic autotrophs, use organic molecules as a source of energy.
C) Photosynthetic autotrophs do not use heat energy from the sun. Instead, they use light energy.
D) Photosynthetic autotrophs like green plants, certain algae, and photosynthetic bacteria, use light for energy.
Question 4
1 / -0

Loss of water in $$C_4$$ plants as compared to $$C_3$$ plants for the same amount of $$CO_2$$ fixed is

A
Double

B
One third

C
One fourth

D
Half

Solution

A) The loss of water in $${ C }_{ 4 }$$ plants is much lesser than the loss of water in $${ C }_{ 3 }$$ plants.
B) The loss of water in $${ C }_{ 4 }$$ plants is reduced as they do not need to keep their stomata open for a long time to take in carbon dioxide due to the efficient $${ C }_{ 4 }$$ pathway and hence, reduce the loss of water through transpiration by one third.
C) The loss of water in $${ C }_{ 4 }$$ plants is one third that of $${ C }_{ 3 }$$ plants.
D) The loss of water is one third.
So the correct answer is 'One third'.
Question 5
1 / -0

Which is not an accessory pigment?

A
Carotene

B
Xanthophyll

C
Chlorophyll a

D
Chlorophyll b

Solution

A) Correct option is (C)
B) Explanation for correct option (C)

An accessory pigment is a light-absorbing compound that occurs in photosynthetic organisms, or repositories of energy, and works with chlorophyll a, which is the most important pigment that occurs in green plants.
A pigment is a molecule that absorbs certain energy, or wavelengths, of light and reflects all others.
Chlorophyll-a is considered an essential photosynthetic pigment because it is directly involved in the conversion of light energy to chemical energy

C) Explanation of incorrect options
Option A) Carotene is an accessory pigment
Option B) Xanthophyll is an accessory pigment
Option D) Chlorophyll b is an accessory pigment.
Question 6
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Which of the following reactions is given by Van Niel?

A
2H$$_2$$O + CO$$_2$$ $$\overset{light}{\longrightarrow}$$ CH$$_2$$O + H$$_2$$O + O$$_2$$

B
CO$$_2$$ + H$$_2$$O $$\overset{light}{\longrightarrow}$$ CH$$_2$$O + O$$_2$$

C
6O$$_2$$ + 12 H$$_2$$O $$\overset{light}{\longrightarrow}$$ C$$_6$$H$$_{12}$$O$$_6$$ + 6H$$_2$$O + 6CO$$_2$$

D
2H$$_2$$O + CO$$_2$$ $$\overset{light}{\longrightarrow}$$ CH$$_2$$O + H$$_2$$O
Solution
Van Niel based upon his studies of purple and green bacteria demonstrated that photosynthesis is essentially a light-dependent reaction in which hydrogen from a suitable oxidisable compound reduces carbon dioxide to carbohydrates.
This can be expressed by:
2H$$_2$$A + CO$$_2$$ $$\overset{light}{\longrightarrow}$$ CH$$_2$$O + H$$_2$$O + A$$_2$$.
In green plants and BGA, H$$_2$$O is the hydrogen donor and is oxidised to O$$_2$$.
In purple and green sulphur bacteria H$$_2$$S is the hydrogen donor and is oxidised to sulphur or sulphate depending on the organism.
He inferred that the O$$_2$$ evolved by the green plant comes from H$$_2$$O not from CO$$_2$$.
Hence, the correct answer is '2H$$_2$$O + CO$$_2$$ $$\overset{light}{\longrightarrow}$$ CH$$_2$$O + H$$_2$$O + O$$_2$$'.
Question 7
1 / -0

What is the quantum yield of photosynthesis?

A
33%

B
9%

C
12%

D
78%

Solution

The number of photons or quanta required by a plant or leaf to release one molecule of oxygen during photosynthesis is called quantum requirement. It has been observed that in most of the cases the quantum requirement is 8.
Quantum yield- The number of oxygen molecule evolved by one quantum of light in photosynthesis is called as Quantum yield. Hence the quantum yield is 0.125 or 12.5%.
Hence, the correct answer is '12%'.
Question 8
1 / -0

In shade plants the ratio of chl a: chl b is

A
4.5 :1

B
1.4:1

C
0.7 : 1

D
5.5 : 1

Solution

Chlorophyll a is the site of photochemical reaction. It absorbs light required for photosynthesis. It is the primary photosynthetic pigment. Chlorophyll b supplies more light energy to chlorophyll a. It is accessory pigment. However, chlorophyll b is more adaptive to stress condition. In absence of light or in shade when chlorophyll a fails to absorb energy, chlorophyll b carries out the function. The ratio of chlorophyll a to b is generally 3:1. However, in shade plants, the ratio is reduced to 1.4:1.
Thus, the correct answer is option B.
Question 9
1 / -0

The ratio of chlorophyll a to chlorophyll b in flowering plants is

A
1 : 1

B
0.5 : 1.5

C
3 : 1

D
5 : 1
Solution
- Chlorophyll a is the site of photo-chemical reaction. It absorbs light required for photosynthesis. It is the primary photosynthetic pigment.
- Chlorophyll b supplies more light energy to chlorophyll a. It is accessory pigment.
- Flowering plants have more chlorophyll a as compared to chlorophyll for survival.
- The ratio of chlorophyll a to b is generally 3:1.
Thus, the correct answer is option C.
Question 10
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During photorespiration which compounds are formed having 2C and 3C respectively in peroxisome?

A
Phosphoglycerate, glycolate

B
Glycine, glycerate

C
Serine, glycine

D
Glycolate, glycine

Solution

Glycine and glycerate are formed in peroxisomes, which are $$2$$ carbon and $$3$$ carbon compound respectively.

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Photosynthesis in Higher Plants Test - 81

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Photosynthesis in Higher Plants Test - 81

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SHARING IS CARING

Question 1

Keep stomata closed during day time

Use PEP carboxylase

Fix $$CO_2$$ into organic acid during the night and release $$CO_2$$ during the day

Perform Calvin cycle at night

Solution

Question 2

Decrease in proton number in stroma

Decrease in pH in the lumen

Accumulation of protons in the lumen

All of the above

Solution

Question 3

Inorganic chemicals

Organic chemicals

Heat

Light

Solution

Question 4

Double

One third

One fourth

Half

Solution

Question 5

Carotene

Xanthophyll

Chlorophyll a

Chlorophyll b

Solution

Question 6

2H$$_2$$O + CO$$_2$$ $$\overset{light}{\longrightarrow}$$ CH$$_2$$O + H$$_2$$O + O$$_2$$

CO$$_2$$ + H$$_2$$O $$\overset{light}{\longrightarrow}$$ CH$$_2$$O + O$$_2$$

6O$$_2$$ + 12 H$$_2$$O $$\overset{light}{\longrightarrow}$$ C$$_6$$H$$_{12}$$O$$_6$$ + 6H$$_2$$O + 6CO$$_2$$

2H$$_2$$O + CO$$_2$$ $$\overset{light}{\longrightarrow}$$ CH$$_2$$O + H$$_2$$O

Solution

Question 7

33%

9%

12%

78%

Solution

Question 8

4.5 :1

1.4:1

0.7 : 1

5.5 : 1

Solution

Question 9

1 : 1

0.5 : 1.5

3 : 1

5 : 1

Solution

Question 10

Phosphoglycerate, glycolate

Glycine, glycerate

Serine, glycine

Glycolate, glycine

Solution

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