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Free download in PDF Photosynthesis Multiple Choice Questions(MCQs) & Answers. These multiple choice questions on Photosynthesis are very useful for SSC, UGC NET, NEET etc.
(1)
Photorespiration, usually occurs in
[A]
One cell organelle
[B]
Two cell organelles
[C]
Three cell organelles
[D]
Four cell organelles
Answer: Three cell organelles
(2)
Stomata opens
[A]
In day time - for gaseous exchange
[B]
In day time - no gaseous exchange
[C]
In night time only - for gaseous exchange
[D]
In night time only - no gaseous exchange
Answer: In day time - for gaseous exchange
(3)
Which of the following statements about phytochrome is true?
[A]
Pr absorbs yellow light and becomes Pfr
[B]
Pfr absorbs red light and becomes Pr
[C]
Pfr absorbs yellow light and becomes Pr
[D]
Pr absorbs red light and becomes Pfr
Answer: Pr absorbs red light and becomes Pfr
(4)
Blackman's law is related to
[A]
Respiration
[B]
Transpiration
[C]
Photosynthesis
[D]
Root pressure
(5)
Photosynthetic bacteria do not contain
[A]
Quantasome
[B]
PS-I and PS-II
[C]
PS-II
[D]
PS-I
(6)
The photorespiratory carbon-oxidation cycle involves the interaction of
[A]
Chloroplast
[B]
Mitochordria
[C]
Peroxisomes
[D]
All of these
(7)
Hill reaction occurs in:
[A]
High altitude plants
[B]
Total darkness
[C]
Absence of water
[D]
Presence of ferricyanide
Answer: Presence of ferricyanide
(8)
Cyclic photophosphorylation invloves
[A]
PS I
[B]
PS II
[C]
PS I and PS II
[D]
P680
(9)
The first stable product of Clavin cycle is
[A]
3-phosphoglycerate
[B]
1, 3 biphosphoglycerate
[C]
Ribulose - 5- phosphate
[D]
Glyceraldehyde - 3 phosphate
Answer: 3-phosphoglycerate
(10)
PS-II occurs only in
[A]
Stroma
[B]
Granal thylakoids
[C]
Stromal lamella
[D]
Matrix
Answer: Granal thylakoids
(11)
Which of the following statements is correct?
[A]
Photorespiration is useful process.
[B]
C4 plants are more efficient than C3 plants.
[C]
C4 plants are less efficient than C3 plants.
[D]
Photorespiration is absent in C3 plants but present in C4 plants
Answer: C4 plants are more efficient than C3 plants.
(12)
Photorespiration shows formation of
[A]
Sugar but not ATP
[B]
ATP but not sugar
[C]
Both ATP and sugar
[D]
Neither ATP nor sugar.
Answer: Neither ATP nor sugar.
(13)
Kranz anatomy is usually associated with
[A]
C3 plants
[B]
C4 plants
[C]
CAM plants
[D]
Enterogasterone, gastrin, pancreozymin and cholecystokinin
(14)
C4 plants have better productivity because
[A]
C4 plants absorb more light
[B]
C4 plants absorb more CO2
[C]
C4 plants have more amount of RuBisCO
[D]
C4 plants does not carry photorespiration
Answer: C4 plants does not carry photorespiration
(15)
The first carbon dioxide fixation product of C4 plant is
[A]
Oxaloacetic acid
[B]
ribulose biphosphate
[C]
phosphoenol pyruvate
[D]
phosphoglyceric acid
(16)
Carbon dioxide is necessary for photosynthesis. The chemical used to remove this gas most effectively from entering a control apparatus is
[A]
Calcium oxide
[B]
Distilled water
[C]
Potassium hydroxide solution
[D]
Sodium carbonate
Answer: Potassium hydroxide solution
(17)
Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because
[A]
There is effective pumping of CO2 into bundle sheath cells
[B]
RuBisCO in C4 plants has higher affinity for CO2
[C]
The primary fixation of CO2 is mediated via PEP carboxylase
[D]
Six carbon acids are the primary initial CO2 fixation products
Answer: The primary fixation of CO2 is mediated via PEP carboxylase
(18)
The chemiosmotic coupling hypotheisis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because
[A]
ADP is pumped out of the matrix into the intermembrane space
[B]
High energy bonds are formed in mitochondrial proteins
[C]
There is a change in the permeability of the inner mitochondrial membrane towards adenosine diphosphate (ADP)
[D]
A proton gradient forms across the inner mitochondrial membrane
Answer: A proton gradient forms across the inner mitochondrial membrane
(19)
Which of the following is incorect about the light reactions of photosynthesis?
[A]
P680 and P700 are the reaction centres of PS-I, and PS-II respectively
[B]
Light energy provides energy for the photolysis of water through excitation of the reaction centre of PS-II
[C]
NADPH is not produced in cyclic electrons transport in light reactions
[D]
Reactions of the two photosystems are needed for the reduction of NADP
Answer: P680 and P700 are the reaction centres of PS-I, and PS-II respectively
(20)
In blue-green algae, photosystem- II contains important pigment concerned with photolysis of water. It is a
[A]
Phycocyanin
[B]
Cytochrome-c
[C]
Chlorophyll -b
[D]
β-carotene
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