Biology Test 356

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Biology Test 356

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Weekly Quiz Competition

Question 1
4 / -1

When one CO₂ molecule is fixed as one molecule of triose phosphate, which of the following photochemically made, high energy chemical intermediates are used in the reduction phase?

A
2 ATP + 2 NADPH

B
1ATP+1NADPH

C
1ATP+2NADPH

D
2 ATP + 1 NADPH

Solution

2 ATPs and 2NADPH are used to fix one molecule of CO₂ into one molecule of triose phosphate.
Question 2
4 / -1

Given below are two statements :

Statement I: The primary CO₂ acceptor in C₄ plants is phosphoenolpyruvate and is found in the mesophyll cells.

Statement II: Mesophyll cells of C₄ plants lack RuBisCo enzyme. In the light of the above statements, choose the correct answer from the options given below:

A
Both Statement I and Statement II are correct

B
Both Statement I and Statement II are incorrect

C
Statement I is correct but Statement II is incorrect

D
Statement I is incorrect but Statement II is correct

Solution

The primary CO₂ acceptor is a 3-carbon molecule, phosphoenol pyruvate (PEP) and is present in the mesophyll cells.

Mesophyll cells of C₄ plants lack RuBisCO enzyme.
Question 3
4 / -1

What is the role of large bundle sheath cells found around the vascular bundles in C₄ plants?

A
To provide the site for photorespiratory pathway

B
To increase the number of chloroplast for the operation of Calvin cycle

C
To enable the plant to tolerate high temperature

D
To protect the vascular tissue from high light intensity

Solution

The large cells around the vascular bundles of mathrm C₄ plants form bundle sheath. These cells have large number of chloroplasts to perform calvin cycle.
Question 4
4 / -1

Which of the following statements is incorrect?

A
Both ATP and NADPH + H⁺ are synthesized during non-cyclic photophosphorylation

B
Stroma lamellae have PS I only and lack NADP reductase

C
Grana lamellae have both PS I and PS II

D
Cyclic photophosphorylation involves both PS I and PS II

Solution

Cyclic photophosphorylation involves only PS I.

Both PS I and PS II are involved in non-cyclic photophosphorylation where both ATP and NADPH + H⁺ are synthesized.

Both PS I and PS II are found on grana lamellae whereas stroma lamellae have PS I only and lack NADP reductase.
Question 5
4 / -1

The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of

A
2 molecules of 3-C compound

B
1 molecule of 3-C compound

C
1 molecule of 6-C compound

D
1 molecule of 3-C compound and 1 molecule of 2-C compound

Solution

The oxygenation activity of RuBisco enzyme in photorespiration leads to the formation of 1 molecule of 3− phosphoglyceric acid (3-C compound) and 1 molecule of phosphoglycolate (2-C compound)
Question 6
4 / -1

Kelps are massive -

A
Amphibious plants

B
Brown algae

C
Flowering plants

D
Plants with naked seeds

Solution

Kelps belong to Phaeophyceae or brown algae.

They are also called giant algae and are exclusively marine.
Question 7
4 / -1

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

A
Increasing atmospheric CO₂ concentration up to 0.05% can enhance CO₂ fixation rate.

B
C₃ plants respond to higher temperature with enhanced photosynthesis while C₄ plants have much lower temperature optimum.

C
Tomato is a greenhouse crop which can be grown in CO₂ -enriched atmosphere for higher yield.

D
Light saturation for CO₂ fixation occurs at 10% of full sunlight

Solution

C₄plants respond to higher temperature with enhanced photosynthesis while C₃ plants have lower temperature optimum.
Question 8
4 / -1

The process which makes major difference between C₃ and C₄ plants is

A
glycolysis

B
Calym cycle

C
photorespiration

D
respiration

Solution

Photorespiration is the light dependent process of oxygenation of ribulose biphosphate (RuBP) and release of carbon dioxide by the photosynthetic organs of a plant. It leads to oxidation of considerable amount of photosynthetic products to CO₂ and H₂O without the production of useful energy. Photorespiration occurs only in C₃ plants because at high temperature and high oxygen concentration RuBP carboxylase changes to RuBP oxygenase. Photorespiration is absent in C₄ plants. Peroxisome and mitochondria are required for completing the process.
Question 9
4 / -1

In a chloroplast the highest number of protons are found in

A
intermembrane space

B
antennae complex

C
stroma

D
lumen of thylakoids.

Solution

Proton concentration is higher in the lumen of thylakoid due to photolysis of water, H⁺ pumping and NADP reductase activity in stroma. During the light-dependent reaction, protons are pumped across the thylakoid membrane into the lumen making it acidic down to pH 4.
Question 10
4 / -1

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant?

A
CAM

B
Nitrogen fixer

C
C₃

D
C₄

Solution

C₄ plants are adapted to hot and dry climate and lack photorespiration due to Kranz anatomy and have greater productivity of biomass.

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Biology Test 356

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Biology Test 356

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Question 1

2 ATP + 2 NADPH

1ATP+1NADPH

1ATP+2NADPH

2 ATP + 1 NADPH

Solution

Question 2

Both Statement I and Statement II are correct

Both Statement I and Statement II are incorrect

Statement I is correct but Statement II is incorrect

Statement I is incorrect but Statement II is correct

Solution

Question 3

To provide the site for photorespiratory pathway

To increase the number of chloroplast for the operation of Calvin cycle

To enable the plant to tolerate high temperature

To protect the vascular tissue from high light intensity

Solution

Question 4

Both ATP and NADPH + H+ are synthesized during non-cyclic photophosphorylation

Stroma lamellae have PS I only and lack NADP reductase

Grana lamellae have both PS I and PS II

Cyclic photophosphorylation involves both PS I and PS II

Solution

Question 5

2 molecules of 3-C compound

1 molecule of 3-C compound

1 molecule of 6-C compound

1 molecule of 3-C compound and 1 molecule of 2-C compound

Solution

Question 6

Amphibious plants

Brown algae

Flowering plants

Plants with naked seeds

Solution

Question 7

Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate.

C3 plants respond to higher temperature with enhanced photosynthesis while C4 plants have much lower temperature optimum.

Tomato is a greenhouse crop which can be grown in CO2 -enriched atmosphere for higher yield.

Light saturation for CO2 fixation occurs at 10% of full sunlight

Solution

Question 8

glycolysis

Calym cycle

photorespiration

respiration

Solution

Question 9

intermembrane space

antennae complex

stroma

lumen of thylakoids.

Solution

Question 10

CAM

Nitrogen fixer

C3

C4

Solution

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Both ATP and NADPH + H⁺ are synthesized during non-cyclic photophosphorylation

Increasing atmospheric CO₂ concentration up to 0.05% can enhance CO₂ fixation rate.

C₃ plants respond to higher temperature with enhanced photosynthesis while C₄ plants have much lower temperature optimum.

Tomato is a greenhouse crop which can be grown in CO₂ -enriched atmosphere for higher yield.

Light saturation for CO₂ fixation occurs at 10% of full sunlight

C₃

C₄