Photosynthesis in Higher Plants Test

Result

Photosynthesis in Higher Plants Test - 50

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Which one is wrong with respect to photorespiration?

A
It occurs in chloroplasts

B
It occurs in day time only

C
It is characteristic of $C_4$ plants

D
It is characteristic of $C_3$ plants

Solution

Photorespiration: It is inhibition of photosynthesis by high O $_2$ level was termed as Warburg effect. However, the inhibition was observed mostly in C $_3$ plants. The C $_4$ plants were hardly affected by varying O $_2$ concentrations. This is because the C4 plants have a spatial separation in the form of mesophyll cells and bundle sheath cells, wherein the CO $_2$ is accepted by PEP rather than RUBP.
The process occurs in chloroplast, peroxisome and mitochondria.
It is rather a wasteful process.
Hence, the correct answer is 'It is characteristic of C $_4$ plants'.
Question 2
1 / -0

Which one is photophosphorylation?

A
ADP + AMP $\overset { Light\,\, energy }{ \longrightarrow }$ ATP

B
ADP + Inorganic phosphate $\overset { Light\, \, energy }{ \longrightarrow }$ ATP

C
ADP + Inorganic PO $_4$ $\longrightarrow$ ATP

D
AMP + Inorganic PO $_4$ $\overset { Light \,\, energy }{ \longrightarrow }$ ATP

Solution

Photosynthetic phosphorylation or photophosphorylation is the process of phosphate group transfer into ADP to synthesize energy-rich ATP molecules making use of light as the external energy source.
It occurs at thylakoid locule to the stroma through ATPase complex due to pH gradient across the membrane. It is believed that single ATP is formed from ADP and Pi( inorganic phosphate) when 3H $^+$ pass through ATPase complex.
ADP + Inorganic phosphate $\overset { Light\, \, energy }{ \longrightarrow }$ ATP.
Hence, the correct answer is 'ADP + Inorganic phosphate $\overset { Light\, \, energy }{ \longrightarrow }$ ATP'.
Question 3
1 / -0

Non-cyclic photophosphorylation produces

A
NAD $^+$

B
NADH

C
NADPH

D
NADP $^+$

Solution

Answer is option C i.e. "NADPH"
The net result of non-cyclic phosphorylation is the formation of NADPH, oxygen and ATP molecules. Oxygen is produced as a waste product of photosynthesis. In non-cyclic phosphorylation electrons are removed from water and passed through PS-II and PS-I before ending up in NADPH.
Question 4
1 / -0

Photorespiration involves oxidation of

A
Chlorophyll a

B
PGA

C
RuBP

D
Both B and C

Solution

Photorespiration occurs due to fact that the active site of enzyme Rubisco (ribulose bisphosphate carboxylase oxygenase) is same for both carboxylation and oxygenation. The oxygenation of RuBP (ribulose bisphosphate) in the presence of O2 is first reaction of photorespiration that leads to the formation of one molecule of phosphoglycolate, a two-carbon compound and one molecule of PGA.

So, the correct option is 'RuBP'.
Question 5
1 / -0

ADP $\longrightarrow$ ATP reaction occurs when two protons ( $H^+$ ) are passed from

A
Thylakoid to cytosol

B
Thylakoid to lumen

C
Lumen of thylakoid to stroma

D
Stroma to thylakoid lumen
Solution
- According to the chemiosmotic hypothesis of ATP synthesis, the ATP synthase enzyme synthesizes ATP by chemiosmosis.
- As electrons travel through the photosystems during cyclic photophosphorylation of light reaction, protons are transferred through the thylakoid membrane i.e. from stroma to thylakoid lumen.
- Thus, within the chloroplast, the number of protons in the stroma decreases, while the number of protons increases in the lumen.
- This generates a proton gradient. This free energy difference is used to phosphorylate ADP to make ATP by ATP synthase by transferring H $^+$ from lumen to stroma as shown in the given diagram.
Thus, the correct answer is 'Lumen of thylakoid to the stroma.'
Question 6
1 / -0

In non-cyclic photophosphorylation, PS I is reduced by

A
Electron from PS II

B
Electron from ferredoxin

C
Hydrogen from water

D
Hydrogen from PS II

Solution

The photosystem II complex replaced its lost electrons from an external source; however, the two other electrons are not returned to photosystem II as they would in the analogous cyclic pathway. Instead, the still-excited electrons are transferred to a photosystem I complex, which boosts their energy level to a higher level using a second solar photon. The highly excited electrons are transferred to the acceptor molecule, but this time is passed on to an enzyme called Ferredoxin-NADP^+ reductase which uses them to catalyse the reaction (as shown):
NADP⁺ + 2H⁺ + 2e⁻ → NADPH + H⁺
This consumes the H⁺ ions produced by the splitting of water, leading to a net production of 1/2O₂, ATP, and NADPH+H⁺ with the consumption of solar photons and water.

So, the correct option is 'Option A'.
Question 7
1 / -0

Which chlorophyll does not possess phytol?

A
Chl a

B
Chl b

C
Chl c

D
Chl d

Solution

Chlorophyll is the green molecule in plant cells that carry out the bulk of energy fixation in the process of photosynthesis. Chlorophyll itself is actually not a single molecule but a family of related molecules, designated chlorophyll a, b, c, and d. Chlorophyll a is the molecule found in all plant cells. Chlorophyll d is found only in marine red algae, but chlorophylls b and c are common in freshwater. The molecular structure of chlorophylls a, b and d consists of a ring-like structure called porphyrin and a long organic phytol "tail". In the centre of the porphyrin ring is a magnesium molecule. Chlorophyll c lacks the phytol chain.

So, the correct answer is option C.
Question 8
1 / -0

Ammonia is produced during

A
Photorespiration

B
CAM

C
Dark respiration

D
All of the above

Solution

Photorespiration involves the conversion of glycine to serine with the release of ammonia and CO(2). In C(3) terrestrial higher plants the flux through glycine and serine is so large that it results in the production of ammonia at a rate far exceeding that from the reduction of new nitrogen entering the plant. The photorespiratory nitrogen cycle re-assimilates this ammonia using the enzymes glutamine synthetase and glutamine:2-oxoglutarate aminotransferase.

So, the correct option is 'Photorespiration'.
Question 9
1 / -0

Which of the following statements are correct?
(a) Photosynthetic ATP synthesis is called photophosphorylation.
(b) Kranz anatomy occurs in leaf.
(c) Reduction in NADP to NADPH occurs during Calvin cycle.
(d) Magnesium occurs in phytol tail of chlorophyll.

A
a and b

B
c and d

C
a and c

D
a and d

Solution

A) In photosynthesis, the phosphorylation of ADP to form ATP using the energy of sunlight is called photophosphorylation. Sp 'a' is correct. Kranz anatomy is the special structure of leaves in ${ C }_{ 4 }$ plants like maize where the tissue equivalent to the spongy mesophyll cells is clustered in a ring around the leaf veins, outside the bundle-sheath cells. So, 'b' is correct.
B) NADPH is required in Calvin's cycle. It is not reduced from NADP to NADPH in Calvin's cycle. So, 'c' is wrong. Magnesium occurs in the porphyrin head of chlorophyll. So, 'd' is wrong.
C) 'a' is correct while 'c' is wrong.
D) 'a' is correct while 'd' is wrong.
So the correct answer is 'a and b'.
Question 10
1 / -0

Which of the following statements is true with regard to the light reaction of photosynthetic mechanism in plants ?

A
Chlorophyll a occurs with peak absorption at $680\ nm$ in photosystem $I$ and $700\ nm$ in phtosystem $II$ .

B
Magnesium and sodium ions are associated with photolysis of water molecules.

C
$O_2$ is evolved during cyclic photo-phosphorylation.

D
Photosystem $I$ and photosystem $II$ are both involved in non-cyclic photophosphorylation.

Solution

A. Chlorophyll a occurs with peak absorption at 700 nm in PS I and 680 nm in PS II.
B. Mn and Cl $^-$ are associated with photolysis of water.
C. No O $_2$ is evolved during cyclic photophosphorylation
D. In non electron transport process the excited electron from PS II is accepted by primary acceptor quinone, which sends them to an electron transport system consisting of plastoquinone, cytochrome complex and plastocyanin.The excited electron absorbed by PS I reaction center, then transfer to the ferredoxin(Fe), then the reduced Ferredoxin donates the electron to NADP $^+$ .
So, the correct answer is 'PS I and PS II are both involved in non- cyclic photophosphorylation'.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Photosynthesis in Higher Plants Test - 50

Result

Photosynthesis in Higher Plants Test - 50

Score

-

Rank

-

SHARING IS CARING

Question 1

It occurs in chloroplasts

It occurs in day time only

It is characteristic of C4C_4C4​ plants

It is characteristic of C3C_3C3​ plants

Solution

Question 2

ADP + AMP ⟶Light energy\overset { Light\,\, energy }{ \longrightarrow }⟶Lightenergy​ ATP

ADP + Inorganic phosphate ⟶Light energy\overset { Light\, \, energy }{ \longrightarrow }⟶Lightenergy​ ATP

ADP + Inorganic PO4_44​ ⟶\longrightarrow⟶ ATP

AMP + Inorganic PO4_44​ ⟶Light energy\overset { Light \,\, energy }{ \longrightarrow }⟶Lightenergy​ ATP

Solution

Question 3

NAD+^++

NADH

NADPH

NADP+^++

Solution

Question 4

Chlorophyll a

PGA

RuBP

Both B and C

Solution

Question 5

Thylakoid to cytosol

Thylakoid to lumen

Lumen of thylakoid to stroma

Stroma to thylakoid lumen

Solution

Question 6

Electron from PS II

Electron from ferredoxin

Hydrogen from water

Hydrogen from PS II

Solution

Question 7

Chl a

Chl b

Chl c

Chl d

Solution

Question 8

Photorespiration

CAM

Dark respiration

All of the above

Solution

Question 9

a and b

c and d

a and c

a and d

Solution

Question 10

Chlorophyll a occurs with peak absorption at 680 nm680\ nm680 nm in photosystem III and 700 nm700\ nm700 nm in phtosystem IIIIII.

Magnesium and sodium ions are associated with photolysis of water molecules.

O2O_2O2​ is evolved during cyclic photo-phosphorylation.

Photosystem III and photosystem IIIIII are both involved in non-cyclic photophosphorylation.

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.

It is characteristic of $C_4$ plants

It is characteristic of $C_3$ plants

ADP + AMP $\overset { Light\,\, energy }{ \longrightarrow }$ ATP

ADP + Inorganic phosphate $\overset { Light\, \, energy }{ \longrightarrow }$ ATP

ADP + Inorganic PO $_4$ $\longrightarrow$ ATP

AMP + Inorganic PO $_4$ $\overset { Light \,\, energy }{ \longrightarrow }$ ATP

NAD $^+$

NADP $^+$

Chlorophyll a occurs with peak absorption at $680\ nm$ in photosystem $I$ and $700\ nm$ in phtosystem $II$ .

$O_2$ is evolved during cyclic photo-phosphorylation.

Photosystem $I$ and photosystem $II$ are both involved in non-cyclic photophosphorylation.