Photosynthesis Test

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Photosynthesis Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

What is the specific function of light energy in photosynthesis?

A
Reduction of CO₂

B
Synthesis of glucose

C
Activate chlorophyll

D
Splitting of water molecules

Solution

Light reaction of photosynthesis starts from the excitation of chlorophyll by a photon. When a photon of light energy falls on a chlorophyll molecule, it gets excited and moves on to a higher level called the excited singlet state. The electron gap in the photosystem is further filled by the process of photolysis.
Hence, the correct option is (C).
Question 2
1 / -0

Which of the following is NOT an adaptation in leaf for photosynthesis?

A
Even distribution of chloroplasts in all the layers of leaf

B
Arrangement of leaf at right angles to light source

C
Numerous stomata to allow rapid exchange of gases

D
Large surface area of leaves for maximum light absorption
Question 3
1 / -0

Which of the following is required by plants for respiration?

A
CO₂

B
H₂O

C
O₂

D
Sunlight
Question 4
1 / -0

A plant is kept at 15°C, 25°C, 35°C, 45°C, respectively under sunlight. The plant will synthesised the maximum amount of starch at

A
15°C

B
25°C

C
35°C

D
45°C
Question 5
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How many molecules of water are required to generate one molecule of glucose in photosynthesis?

A
6

B
12

C
18

D
24
Question 6
1 / -0

During photosynthesis, the oxygen in glucose comes from:

A
Water

B
Carbon dioxide

C
Both from CO₂ and water

D
Oxygen in air

Solution

During photosynthesis, the oxygen in glucose comes from carbon dioxide.
Photosynthesis is the process of carbon fixation which mainly takes place in two steps, light reaction, and dark reaction. ATP and NADPH₂ are produced in the light reaction which is utilized for carbon fixation during the dark reaction. When the plant makes the glucose molecule, it gets the carbon and oxygen atoms it needs from carbon dioxide, which is taken by the air through the stomatal openings. Carbon dioxide doesn't have any hydrogen in it, though, so the plant must use another source for hydrogen. The source that it uses is water.
Hence, the correct option is (B).
Question 7
1 / -0

Which of the following is the end product in dark reaction?

A
NADPH

B
Glucose

C
ATP

D
Oxygen
Question 8
1 / -0

How is opening and closing of stomata carried out?

A
By movement of water

B
By absorption of CO₂

C
By absorption of O₂

D
By movement of salts
Question 9
1 / -0

Which of the following statements is NOT true?

A
The immediate product of photosynthesis is glucose.

B
Photosynthesis is maximum at 35°C.

C
Dark reaction of photosynthesis utilises oxygen.

D
Photolysis is carried out in thylakoids.

Question 10

1 / -0

Match the following:

(i) Photosynthesis	(A) Glucose
(ii) Respiration	(B) Removal of water
(iii) Transpiration	(C) Generation of CO₂
(iv) Polymerisation	(D) Generation of O₂

(i) - (C), (ii) - (D), (iii) - (B), (iv) - (A)

(i) - (D), (ii) - (C), (iii) - (B), (iv) - (A)

(i) - (C), (ii) - (D), (iii) - (A), (iv) - (B)

(i) - (D), (ii) - (C), (iii) - (A), (iv) - (B)

Question 11
1 / -0

Name the metal present in chlorophyll ‘a’ and ‘b’?

A
Iron

B
Copper

C
Magnesium

D
Manganese

Solution

'Magnesium' present in chlorophyll ‘a’ and ‘b’. The chlorophyll molecule has a porphyrin head with a tetrapyrrolic ring structure and a phytol tall of hydrocarbons. Magnesium is present in the head region of the chlorophyll molecule.
Hence, the correct option is (C).
Question 12
1 / -0

Cellular respiration takes place in:

A
Mitochondria

B
Ribosome

C
Golgi body

D
Endoplasmic reticulum
Solution
Cellular respiration takes place in Mitochondria.
- Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert chemical energy from oxygen molecules or nutrients into adenosine triphosphate (ATP), and then release waste products.
- Cellular respiration takes place in Mitochondria.
- Mitochondria are membrane-bound cell organelles (mitochondrion, singular) that generate most of the chemical energy needed to power the cell's biochemical reactions.
- Chemical energy produced by the mitochondria is stored in a small molecule called adenosine triphosphate (ATP).
- Mitochondria are often referred to as the powerhouses of the cell.
Hence, the correct option is (A).
Question 13
1 / -0

Which of the following processes does not add CO₂ into atmosphere?

A
Respiration

B
Combustion

C
Transpiration

D
Decomposition
Question 14
1 / -0

Why is starch used as a measure of photosynthesis in leaves?

A
Starch formation requires photosynthesis

B
Because glucose formed is rapidly converted into starch

C
Because starch is soluble in water

D
Because glucose is insoluble in water

Solution

Starch is a white and powdery substance. It houses glucose, which plants use for food. The presence of starch in a leaf is reliable evidence of photosynthesis. That's because starch formation requires photosynthesis.
Hence, the correct option is (A).
Question 15
1 / -0

How does the rate of photosynthesis vary with increasing light intensity?

A
It increases continuously till light energy is available.

B
It increases and then decreases after a certain point.

C
It increases initially and then gets stabilised at certain point.

D
It remains uniform with increasing light intensity.
Question 16
1 / -0

A plant was kept in varying conditions of light, humidity, temperature and CO₂ concentration. Which of the following conditions will show no change in the rate of photosynthesis?

A
Light intensity

B
Humidity

C
Temperature

D
CO₂ concentration

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Re-Attempt Weekly Quiz Competition

Photosynthesis Test - 5

Result

Photosynthesis Test - 5

Score

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Rank

-

SHARING IS CARING

Question 1

Reduction of CO2

Synthesis of glucose

Activate chlorophyll

Splitting of water molecules

Solution

Question 2

Even distribution of chloroplasts in all the layers of leaf

Arrangement of leaf at right angles to light source

Numerous stomata to allow rapid exchange of gases

Large surface area of leaves for maximum light absorption

Question 3

CO2

H2O

O2

Sunlight

Question 4

15°C

25°C

35°C

45°C

Question 5

6

12

18

24

Question 6

Water

Carbon dioxide

Both from CO2 and water

Oxygen in air

Solution

Question 7

NADPH

Glucose

ATP

Oxygen

Question 8

By movement of water

By absorption of CO2

By absorption of O2

By movement of salts

Question 9

The immediate product of photosynthesis is glucose.

Photosynthesis is maximum at 35°C.

Dark reaction of photosynthesis utilises oxygen.

Photolysis is carried out in thylakoids.

Question 10

(i) - (C), (ii) - (D), (iii) - (B), (iv) - (A)

(i) - (D), (ii) - (C), (iii) - (B), (iv) - (A)

(i) - (C), (ii) - (D), (iii) - (A), (iv) - (B)

(i) - (D), (ii) - (C), (iii) - (A), (iv) - (B)

Question 11

Iron

Copper

Magnesium

Manganese

Solution

Question 12

Mitochondria

Ribosome

Golgi body

Endoplasmic reticulum

Solution

Question 13

Respiration

Combustion

Transpiration

Decomposition

Question 14

Starch formation requires photosynthesis

Because glucose formed is rapidly converted into starch

Reduction of CO₂

CO₂

H₂O

O₂

Both from CO₂ and water

By absorption of CO₂

By absorption of O₂

CO₂ concentration