Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 69

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following was used in the study of dark reaction of photosynthesis?

A
Hydrilla

B
Chlorella and Scenedesmus

C
Chlamydomonas

D
Chlorella and Spirogyra

Solution

Microalgae require a light: the dark routine for profitable photosynthesis. of some green growth species Chlorella, Spirogyra, Chlamydomonas, Botryococcus, were contemplated the impact of temperature and light power on their development.
So, the correct option is 'Chlorella and Spirogyra'.
Question 2
1 / -0

Choose incorrect statement about photosynthesis.

A
It is a physico- chemical process

B
Oxygen is not evolved as a by product in most photosynthetic organisms

C
Occurs in unicellular and multicellular photoautotrophs

D
Anabolic and reductive process
Solution
- Photosynthesis is a physico - chemical process that occurs in the living systems and involves the conversion of solar energy into chemical energy in the form of organic carbon as glucose.
- It starts with the absorption of photons from sun-light by the chlorophyll and subsequent production of assimilatory powers of ATP and NADPH in light reaction and then usage of these assimilatory powers in the dark reaction for the reduction of the carbon dioxide.
- Oxygen is evolved as the by-product during the light reaction of photosynthesis but there are examples of non-oxygenic photosynthetic bacteria as well like Rhodospirillum.
- etc.) and multicellular (plants) that are photoautotrophic. It is an anabolic process, resulting in the formation of glucose and a reductive process resulting in a reduction of carbon dioxide.
Hence, the correct answer is option B.
Question 3
1 / -0

Photosynthetic yield is reduced due to

A
Plasmolysis of cell

B
Glycolysis of glucose

C
Photolysis of water

D
Photorespiration

Solution

During high temperature and increase in the concentration of the oxygen, the photosynthetic yield declines due to the increase in the affinity of the enzyme ribulose bisphosphate carboxylase oxygenase (RuBPCO) for the oxygen and decrease in the affinity for the carbon dioxide. Due to this change in affinity, it binds with oxygen instead of carbon dioxide and then the process of photorespiration begins rather than the dark reaction. It is a wasteful process in which plants have to spend ATPs to regenerate the enzyme and the carbon.
Hence, the correct answer is 'Photorespiration'.
Question 4
1 / -0

$$C_4$$ plant are less efficient at low temperature due to

A
Low $$O_2$$ affinity of PEP case

B
Cold sensitivity of PEP carboxylase enzyme

C
Reduced rate of decarboxylation of organic acids

D
High energy requirement for $$CO_2$$ fixation.

Solution

C$$_{4}$$ plants are widespread in tropical regions as they have ability to use the maximum carbon dioxide even with the high temperature and high light intensity. However, their photosynthetic efficiency declines at low temperature due to inactivation of the PEP carboxylase enzyme and high amount of energy required due to photoprotection effect.
Hence, the correct answer is 'Cold Sensitivity of PEP carboxylase enzyme'
Question 5
1 / -0

The product of oxygenation of RUBP is

A
Phosphoglycerate

B
Phosphoglycolate

C
Oxaloacetate

D
Both A and B

Solution

RuBP + O$$_{2}$$ → Phosphoglycolate + 3-Phosphoglycerate + 2H$$^{+}$$
Addition of O$$_{2}$$ to ribulose-1,5-bisphosphate produces 3-phosphoglycerate and 2-phosphoglycolate. Phosphoglycerate refers to 2-phosphoglycerate and 3-phosphoglycerate (but only 3-PGA is produced in this reaction).
So, the correct option is 'Phosphoglycolate'
Question 6
1 / -0

Due to photo respiration approximately ......... of photosynthetically fixed CO2 is lost

A
25%

B
50%

C
60%

D
80%

Solution

While photorespiration, the oxygenation reaction of RuBisCO is a wasteful process because 3-phosphoglycerate is created at a reduced rate and higher metabolic cost compared with RuBP carboxylase activity. While photorespiratory carbon cycling results in the formation of G3P eventually, there is also a net loss of carbon i.e., 25% of carbon fixed by photosynthesis is re-released as CO$$_{2}$$.
So, the correct option is '25%'.
Question 7
1 / -0

Which of the following cell organelles in concerned with photophosphorylation?

A
Mitochondria

B
Plastochondria

C
Chloroplast

D
More than one option is concerned

Solution

The synthesis of ATP is called phosphorylation. If it occurs in the presence of light, it is called photophosphorylation, that occurs during photosynthesis in the chloroplast. Mitochondria perform oxidative and substrate level phosphorylation.
Hence, the correct answer is 'Chloroplast'
Question 8
1 / -0

In $$C_4$$ plants, the final fixation of $$CO_2$$ takes place at

A
Mesophyll cell's chloroplast

B
Bundle sheath cell's cytoplasm

C
Mesophyll cell's cytoplasm

D
Bundle sheath cell's chloroplast

Solution

After carbon fixation, the OAA produced is transported from the cytosol of mesophyll cells to chloroplasts of bundle-sheath cells. Here, decarboxylation of OAA takes place and it releases pyruvic acid and fixed CO$$_{2}$$. The pyruvic acid is transported back to mesophyll whereas the CO$$_{2}$$ enters the Calvin cycle.
So, the correct option is 'Bundle sheath cell's chloroplast'.
Question 9
1 / -0

The molar ratio of chlorophyll and xanthophyll is

A
4 : 1

B
3 : 1

C
1 : 1

D
2 : 1

Solution

The molar ratio of chlorophyll and xanthophyll is 3:1.
Chlorophyll is a green pigment, present in all green plants and in cyanobacteria, which is responsible for the absorption of light to provide energy for photosynthesis.
Xanthophyll is a yellow or brown carotenoid plant pigment which causes the autumn colors of leaves.
So, the correct answer is "3:1".
Question 10
1 / -0

The $$CO_2$$ fixation during $$C_4$$ pathway occurs in the chloroplast of

A
Guard cells

B
Bundle sheath cells

C
Mesophyll cells

D
Spongy parenchyma

Solution

The Carbon fixation pathway in C$$_4$$ plants begins in mesophyll cells, where the CO$$_2$$ gets converted to bicarbonate, which is then added to the three-carbon acid phosphoenolpyruvate (PEP) by the action of enzyme phosphoenolpyruvate carboxylase.
So, the correct answer is 'Mesophyll cells'.

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Re-Attempt Weekly Quiz Competition

Photosynthesis in Higher Plants Test - 69

Result

Photosynthesis in Higher Plants Test - 69

Score

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Rank

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SHARING IS CARING

Question 1

Hydrilla

Chlorella and Scenedesmus

Chlamydomonas

Chlorella and Spirogyra

Solution

Question 2

It is a physico- chemical process

Oxygen is not evolved as a by product in most photosynthetic organisms

Occurs in unicellular and multicellular photoautotrophs

Anabolic and reductive process

Solution

Question 3

Plasmolysis of cell

Glycolysis of glucose

Photolysis of water

Photorespiration

Solution

Question 4

Low $$O_2$$ affinity of PEP case

Cold sensitivity of PEP carboxylase enzyme

Reduced rate of decarboxylation of organic acids

High energy requirement for $$CO_2$$ fixation.

Solution

Question 5

Phosphoglycerate

Phosphoglycolate

Oxaloacetate

Both A and B

Solution

Question 6

25%

50%

60%

80%

Solution

Question 7

Mitochondria

Plastochondria

Chloroplast

More than one option is concerned

Solution

Question 8

Mesophyll cell's chloroplast

Bundle sheath cell's cytoplasm

Mesophyll cell's cytoplasm

Bundle sheath cell's chloroplast

Solution

Question 9

4 : 1

3 : 1

1 : 1

2 : 1

Solution

Question 10

Guard cells

Bundle sheath cells

Mesophyll cells

Spongy parenchyma

Solution

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