Photosynthesis Test

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Photosynthesis Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Consider the following statements and choose the correct answer.

a. Photochemical phase occurs inside the thylakoids, especially those of grana region.
b. Biosynthetic phase reactions occur in stroma or matrix of chloroplasts and are dependent upon light.

A
Both the statements are true.

B
Both the statements are false.

C
Statement 'b' is true and 'a' is false.

D
Statement 'a' is true and 'b' is false.

Solution

This is the correct option as statement 'b' is false. Biosynthetic phase reactions occur in stroma or matrix of chloroplasts and do not require light.
Question 2
1 / -0

Photosynthetically active radiation has a wavelength of

A
100 - 390 nm

B
400 - 700 nm

C
760 - 10000 nm

D
None of these

Solution

Photosynthetically active radiation (PAR) is light of wavelengths 400-700 nm. It is the portion of the light spectrum utilised by plants for photosynthesis.
Question 3
1 / -0

Thylakoids possessing four types of major complexes have their membranes made up of both proteins and unsaturated lipids. Which of the following complexes is/are evenly distributed in the stroma and granal thylakoids?

a. Photosystem I
b. Photosystem II
c. Cyt b₆-f complex

A
Only a

B
Only a and b

C
Only b

D
Only c

Solution

Cyt b₆-f complexes are evenly distributed in the stroma and granal thylakoids.
Question 4
1 / -0

In the matrix or stroma are embedded a number of flattened membranous sacs called thylakoids. At places, the thylakoids are aggregated to form stacks of discs called

A
stroma thylakoids

B
loculus

C
partition

D
grana

Solution

In the matrix or stroma are embedded a number of flattened membranous sacs called thylakoids. At places, the thylakoids are aggregated to form stacks of discs called grana. A granum may have 20 - 50 thylakoid discs.
Question 5
1 / -0

Chlorophylls are the green photosynthetic pigments and out of a, b, c, d and e types of chlorophylls occurring in plants, chlorophyll a and b occur in the chloroplasts of higher plants. Which of the following is the characteristic of chlorophyll b?

A
In pure state, chlorophyll b is blue-green.

B
It is soluble in 92% methyl alcohol.

C
It is a primary photosynthetic pigment.

D
It absorbs more red wavelength than violet-blue wavelength of light.

Solution

In pure state, chlorophyll b is olive-green. In pure state, chlorophyll a is blue-green.Chlorophyll b is an accessory photosynthetic pigment. Chlorophyll a is a primary photosynthetic pigment.Chlorophyll b absorbs more violet-blue wavelength than red wavelength of light. Chlorophyll a absorbs more red wavelength than violet-blue wavelength of light. Chlorophyll b is soluble in 92% methyl alcohol.
Question 6
1 / -0

Which of the following are open tetrapyrroles that do not contain magnesium and phytol?

a. Carotenoids
b. Phycobilins
c. Chlorophylls

A
Only a

B
Only a and b

C
Only b

D
Only c

Solution

Phycobilins are open tetrapyrroles that neither contain magnesium nor phytol. They are water soluble and occur in association with proteins or biliproteins.
Question 7
1 / -0

Photophosphorylation is the light driven or light energised synthesis of ATP and is of two main types - cyclic and non-cyclic. Which of the following is a characteristic of non-cyclic photophosphorylation?

A
It is not connected with photolysis of water. Therefore, no oxygen is evolved.

B
It synthesises only ATP.

C
It occurs mostly in stromal or intergranal thylakoids.

D
It is performed by collaboration of both photosystems I and II.

Solution

Non-cyclic photophosphorylation is performed by collaboration of both photosystems I and II. It is the light-requiring part of photosynthesis in higher plants, in which an electron donor is required, and oxygen is produced as a waste product. It consists of two photoreactions, resulting in the synthesis of ATP and NADPH.
Question 8
1 / -0

Consider the following statements and choose the correct answer.

a. Carotenes and xanthophylls are soluble in organic solvents but carotenes are more soluble in carbon disulphide as compared to xanthophylls.
b. Glyceraldehyde-3-phosphate is a key product which is used in synthesis of both carbohydrates and fats.

A
Both the statements are true.

B
Both the statements are false.

C
Statement 'a' is true and 'b' is false.

D
Statement 'b' is true and 'a' is false.

Solution

This is the correct option as both the statements are true
Carotene and Xanthophyll are types of plant pigments that plays a role in the metabolism of plants.Carotenes and xanthophylls are soluble in organic solvents but carotenes are more soluble in carbon disulphide as compared to xanthophylls.
b. Glyceraldehyde-3-phosphate is a key product which is used in synthesis of both carbohydrates and fats.An aldotriose which is an important intermediate in glycolysis and in tryptophan biosynthesis.
Question 9
1 / -0

Photorespiration is the light dependent process of oxygenation of RuBP and release of carbon dioxide by the photosynthetic organs of a plant. Photorespiration increases with increase of

A
temperature

B
concentration of oxygen

C
age of the leaf

D
All of these

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Photosynthesis Test - 4

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Photosynthesis Test - 4

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Question 1

Both the statements are true.

Both the statements are false.

Statement 'b' is true and 'a' is false.

Statement 'a' is true and 'b' is false.

Solution

Question 2

100 - 390 nm

400 - 700 nm

760 - 10000 nm

None of these

Solution

Question 3

Only a

Only a and b

Only b

Only c

Solution

Question 4

stroma thylakoids

loculus

partition

grana

Solution

Question 5

In pure state, chlorophyll b is blue-green.

It is soluble in 92% methyl alcohol.

It is a primary photosynthetic pigment.

It absorbs more red wavelength than violet-blue wavelength of light.

Solution

Question 6

Only a

Only a and b

Only b

Only c

Solution

Question 7

It is not connected with photolysis of water. Therefore, no oxygen is evolved.

It synthesises only ATP.

It occurs mostly in stromal or intergranal thylakoids.

It is performed by collaboration of both photosystems I and II.

Solution

Question 8

Both the statements are true.

Both the statements are false.

Statement 'a' is true and 'b' is false.

Statement 'b' is true and 'a' is false.

Solution

Question 9

temperature

concentration of oxygen

age of the leaf

All of these

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