Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 17

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Question 1
1 / -0

In chlorophyll structure four pyrole rings are united with Mg by their atoms of

A
N

B
C

C
H

D
O

Solution

Chlorophyll is a chlorin pigment, which is structurally similar to and produced through the same metabolic pathway as other porphyrin pigments such as heme. At the centre of the chlorin ring is a magnesium ion. The chlorin ring can have several different side chains, usually including a long phytol chain. There are a few different forms that occur naturally, but the most widely distributed form in terrestrial plants is chlorophyll a.
Question 2
1 / -0

In $$C_{4}$$ plants, CO$$_{2}$$ combines with PEP in the presence of

A
PEP carboxylase

B
RuBP carboxylase

C
RuBP oxygenase

D
Hydrogenase
Solution
- Phosphoenolpyruvate carboxylase, an enzyme found in all multicellular plants, catalyzes the formation of oxaloacetate from phosphoenolpyruvate (PEP) and a hydrocarbonate ion.
- This reaction is harnessed by C$${_4}$$ plants to capture and concentrate carbon dioxide into the photosynthetic bundle sheath cells.
So, the correct answer is option (A).
Question 3
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Which elements are left when chlorophyll is burnt?

A
Iron

B
Manganese

C
Magnesium

D
Molybdenum

Solution

Chlorophyll has a central metal element magnesium. It is the only element, which remains when chlorophyll is burnt as it has very high ignition temperature.
So, the correct answer is option C.
Question 4
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The role of chlorophyll in photosynthesis is

A
Absorption of CO$$_{2}$$

B
Absorption of light

C
Absorption of light and photochemical decomposition of water

D
Absorption of water
Solution
Correct option: C

Explanation:
The role of chlorophyll in photosynthesis is absorption of light and photochemical decomposition of water.
It is a primary pigment used in photosynthesis, which absorbs red and blue light and reflect green light making the leaves appear in green color.
The absorbed light helps in the photolysis of water that provides electrons and protons in thylakoid membrane of chloroplast.
Thus, Option C is correct.
Question 5
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Blue-green algae possess

A
Chlorophyll a

B
Chlorophyll b

C
Both A and B

D
None of the above

Solution

Chlorophyll a is a specific form of chlorophyll used in oxygenic photosynthesis. It absorbs most energy from wavelengths of violet-blue and orange-red light.
So, the correct answer is option A.
Question 6
1 / -0

During non-cyclic photophosphorylation in which of the following, $$4e^{-}$$ produced through photolysis will enter?

A
PS- II

B
PC

C
PQ

D
PS- I

Solution

Photosystem II has P680 reaction center wherein oxygen atoms of two water molecules bind to a cluster of manganese atoms. These Mn atoms are bound to the reaction center and assocaited with an enzyme that splits water, removes electrons one at a time. These electrons fill the holes which are left in the reaction center due to released to light-energized electrons. Immediately after removal of four electrons from the two water molecules, O2 is released. Sunlight driven splitting of water is called as photolysis. Correct answer is A.
Question 7
1 / -0

Non-cyclic photophosphorylation involves

A
PS- I and PS- II

B
PS- I only

C
PS- II only

D
Stroma matrix

Solution

Non-cyclic photophosphorylation involves both photosystems I and II. The electron follows a non-cyclic pathway in it. The representation of it is also called Z scheme.
Question 8
1 / -0

The core metal of chlorophyll is

A
Fe

B
Mg

C
Ni

D
Cu

Solution

Chlorophyll is a green compound found in leaves and green stems of plants. Magnesium is the core metal in chlorophyll.
So, the correct answer is 'Mg'
Question 9
1 / -0

Chlorophyll is

A
Soluble in organic solvents

B
Soluble in water

C
Soluble in both organic solvents in water

D
None of these
Solution
Correct option: A

Explanation:
Chlorophyll is soluble in organic solvents. It consists of a chlorine ring, whose four nitrogen atoms surround a central magnesium atom and has attached side chains with a hydrophobic tail.
Due to presence of hydrophobic tail, it is insoluble in water and soluble in organic solvents like alcohol and acetone.
Thus, Option A is correct.
Question 10
1 / -0

In non-cyclic photophosphorylation there is photolysis of 12 water molecules. How many $$H^{+}$$ are formed?

A
24 $$H^{+}$$

B
36 $$H^{+}$$

C
12 $$H^{+}$$

D
32 $$H^{+}$$
Solution
When a single molecule of water is photolyzed, two molecules of $$H^+$$ ions are formed.
Thus, if 12 molecules of water are involved, 24 molecules of $$H^+$$ will be produced.
So, the correct answer is '24 $$H^{+}$$