Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 52

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Question 1
1 / -0

Enzyme responsible for primary carboxylation in $$C_4$$ plants is

A
PEP carboxylase

B
Succinic dehydrogenase

C
RuBP carboxylase oxygenase

D
Hexokinase

Solution

A) PEP carboxylase is the primary carbon dioxide acceptor in $${ C }_{ 4 }$$ plants.
B) Succinic dehydrogenase is the enzyme that converts Succinic acid to Fumaric acid in Kreb's cycle.
C) RuBP carboxylase oxygenase is used in $${ C }_{ 3 }$$ plants.
D) Hexokinase is an enzyme that phosphorylates hexoses (six-carbon sugars), forming hexose phosphate. Glucose-6-phosphate is its most important product. It is involved in phosphorylation.
So the correct answer is 'PEP carboxylase'.
Question 2
1 / -0

Plants are removed from patient's room during night because

A
They consume $$O_2$$ at night.

B
They release $$CO_2$$ at night.

C
They produce $$CO_2$$ all the time but release $$O_2$$ only during day.

D
They do not photosynthesize at night but they increase $$CO_2$$ concentration at night.

Solution

A) Plants take in oxygen at night to release energy from the sugars formed during the day.
B) Plants release carbon dioxide at night as a byproduct of the breakdown of sugars for energy.
C) Plants absorb carbon dioxide during the day and produce it at night.
D) Plants are removed from patient's rooms at night because they may reduce the oxygen concentration of the air. Respiration uses oxygen to release energy from the stored sugar and produces carbon dioxide as a byproduct, increasing its concentration which is harmful for the patient.
So the correct answer is 'They do not photosynthesise but release CO2 and increase its concentration at night'.
Question 3
1 / -0

In chlorophyll, four pyrrole rings are attached to Mg through ............. atoms.

A
C

B
H

C
O

D
N

Solution

A) C forms the primary structure of chlorophyll.
B) H along with C forms the primary structure of chlorophyll.
C) O is present as ketone groups.
D) Four pyrrole rings are attached to Mg through four N atoms.
So the correct answer is 'N'.
Question 4
1 / -0

In $$C_4$$ pathway, $$CO_2$$ fixation in mesophyll cells is carried out by the enzyme

A
PEP carboxylase

B
Pyruvate dehydrogenase

C
RuBisCO

D
Pyruvate decarboxylase

Solution

A) PEP carboxylase is the primary acceptor of carbon dioxide and fixes it.
B) Pyruvate dehydrogenase is used in the citric acid cycle to convert pyruvic acid to Acetyl CoA.
C) RuBisCO is involved in $${ C }_{ 3 }$$ plants.
D) Pyruvate decarboxylase is an enzyme that catalyses the decarboxylation of pyruvic acid to acetaldehyde.
So the correct answer is 'PEP carboxylase'.
Question 5
1 / -0

Non-cyclic electron flow in chloroplast/light reaction results in production of

A
ATP

B
ATP and NADPH

C
ATP, NADPH, $$O_2$$

D
NADPH

Solution

A) ATP is produced by the reaction $$ATP\quad +iP\quad \longrightarrow \quad ATP$$.
B) NADPH is produced from $${ NADP }^{ + }$$.
C) $${ O }_{ 2 }$$ is produced by the splitting of water. ATP and NADPH are produced in non cyclic electron flow.
D) NADPH is produced in non cyclic electron flow.
So the correct answer is 'ATP, NADPH, $$O_{ 2 }$$'.
Question 6
1 / -0

Which of the following statement is correct for C$$_4$$ plants?

A
Light phase occurs in bundle sheath cells

B
$$CO_2$$ fixation occurs in mesophyll cells

C
Light phase occurs in mesophyll cells

D
Photorespiration occurs in mesophyll cells

Solution

A) The light reaction occurs in the mesophyll cells, not bundle sheath cells.
B) Carbon dioxide fixation takes place in bundle sheath cells.
C) Light phase or light reactions take place in the meosphyll cells.
D) Photorespiration does not occur in $${ C }_{ 4 }$$ plants.
So the correct answer is 'Light phase occurs in mesophyll cells'.
Question 7
1 / -0

Study the pathway given above.
In which of the following options correct words for all the three blanks a, b and c are indicated.

A
a - Decarboxylation, b - Reduction, c - Regeneration

B
a - Fixation, b - Transamination, c - Regeneration

C
a - Fixation, b - Decarboxylation, c - Regeneration

D
a - Carboxylation, b - Decarboxylation, c - Reduction

Solution

A) 'a' refers to the fixation of atmospheric carbon dioxide. So, a - fixation.
B) 'b' refers to the decarboxylation of the $${ C }_{ 4 }$$ acid to form a three carbon molecule, releasing carbon dioxide. So, b - decarboxylation.
C) 'c' refers to the regeneration of PEP from carbon dioxide and $${ C }_{ 3 }$$ acid. So, c - regeneration.
D) a - Fixation, b - Decarboxylation, c - Regeneration.
So the correct answer is 'a - Fixation, b - Decarboxylation, c - Regeneration'.
Question 8
1 / -0

Chlorophyll appears green due to

A
Absorption of green light

B
Red fluorescence

C
Green fluorescence

D
Absorption of red and blue light

Solution

A) Green light is not absorbed by chlorophyll, but is reflected and so, chlorophyll appears green.
B) Red fluorescence is not related to the green appearance of chlorophyll.
C) Green fluorescence is not related to the green appearance of chlorophyll. Chlorophyll appears green as it reflects green light.
D) Chlorophyll appears green as it absorbs light in the red (long wavelength) and the blue (short wavelength) regions of the visible light spectrum. Green light is not absorbed but reflected, making chlorophyll appear green.
So the correct answer is 'Absorption of red and blue light'.
Question 9
1 / -0

Which of the following is not related to photorespiration?

A
Peroxisomes

B
Lysosomes

C
Mitochondria

D
Chloroplasts

Solution

A) The peroxisome is involved in photorespiration. Glyoxylate and glycine are produced.
B) Lysosomes are not involved in photorespiration.
C) The mitochondrion takes part in the last stage of photorespiration.
D) Photorespiration is initiated in the chloroplast.
So the correct answer is 'Lysosomes'.
Question 10
1 / -0

Free radical has electron

A
Unpaired and extremely reactive

B
Paired and extremely inactive

C
Unpaired and extremely inactive

D
Paired and extremely reactive
Solution
- Free radicals are atoms or groups of atoms with an odd (unpaired) number of electrons and can be formed when oxygen interacts with certain molecules. Once formed, these radicals are highly reactive.
- Free radicals are unpaired and extremely active. They can start chain reactions.
So the correct answer is 'Unpaired and extremely reactive'.