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Photosynthesis in Higher Plants (Class - XI)

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The experiments of which of the following scientists showed that small bubbles were formed around green parts in bright sunlight, while in the dark, they did not?

  1. Joseph Priestley

  2. Julius von Sachs

  3. T. W. Engelmann

  4. Jan Ingenhousz

  5. Cornelius van Niel


Correct Option: D
Explanation:

This is the correct option. He is best known for showing that light is essential to photosynthesis and thus having discovered photosynthesis.

In chloroplasts, there is a membranous system. Which of the following is/are not a part of this membranous system?

a. Grana b. Starch granule c. Stroma lamellae

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: C
Explanation:

This is the correct option. Starch granule is not a part of the membranous system of the chloroplast.

Which of the following statements is/are false?

a. The substances that have an ability to absorb light at specific wavelengths are called pigments. b. The membrane system is responsible for the synthesis of ATP and NADPH. c. Most of the photosynthesis takes place in the yellow and green regions of the spectrum.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: D
Explanation:

This is the correct option as this statement is false. Most of the photosynthesis takes place in the blue and red regions of the spectrum.

In photosynthesis, the proton accumulation is in the

  1. lumen

  2. ribosome

  3. mitochondria

  4. vacuole

  5. cytoplasm


Correct Option: A
Explanation:

This is the correct option. In photosynthesis, the proton accumulation is in the lumen.

In which of the following parts of a cell is ATP synthesised?

a. Ribosome b. Mitochondria c. Chloroplast d. Nucleus

  1. Only a and b

  2. Only a and c

  3. Only a and d

  4. Only b and d

  5. Only b and c


Correct Option: E
Explanation:

This is the correct option. ATP is synthesised by the cell in mitochondria and chloroplast.

Which of the following is the major pigment responsible for trapping light for photosynthesis?

  1. Chlorophyll b

  2. Xanthophylls

  3. Chlorophyll a

  4. Carotenoids

  5. None of these


Correct Option: C
Explanation:

This is the correct option. Chlorophyll a is the major pigment responsible for trapping light for photosynthesis.

Which of the following is not a characteristic of C4 plants?

  1. C4 plants show a response to high light intensities.

  2. C4 plants lack a process called photorespiration.

  3. C4 plants have a special type of leaf anatomy.

  4. C4 plants cannot tolerate higher temperatures.

  5. C4 plants have greater productivity of biomass.


Correct Option: D
Explanation:

This is the correct option as this is not a characteristic of C4 plants. They can tolerate higher temperatures.

Which of the following products of light reaction is/are used to drive the processes leading to the synthesis of sugars?

a. Oxygen b. ATP c. NADPH

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: D
Explanation:

This is the correct option. ATP and NADPH are used to drive the processes leading to the synthesis of sugars.

Which of the following is/are not internal factor(s) that affect(s) photosynthesis?

  1. Orientation of leaves

  2. Mesophyll cells and chloroplast

  3. Amount of chlorophyll

  4. Carbon dioxide concentration

  5. Number of leaves


Correct Option: D
Explanation:

This is the correct option as carbon dioxide concentration is not an internal factor that affects photosynthesis. It is an external factor.

Which of the following statements is/are false?

a. In carbon fixation cycle, carbon dioxide is added by ATPase enzyme to a 5-carbon compound RuBP. b. Light harvesting complexes are made up of hundreds of pigment molecules bound to proteins. c. The enzyme NADP reductase is located on the stroma side of the membrane.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: A
Explanation:

This is the correct option as this statement is false. 

The large cells around the vascular bundles of the C4 pathway plants are called bundle sheath cells. Which of the following is/are not characteristic(s) of bundle sheath cells?

a. No intercellular spaces b. Thick walls impervious to gaseous exchange c. Very less number of chloroplasts

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: E
Explanation:

This is the correct option as this is not a characteristic of bundle sheath cells. They have large number of chloroplasts.

Match the following ||| |---|---| |a. Carboxylation phase|1. During this phase, carbohydrate is formed at the expense of the photochemically made ATP and NADPH.| |b. Reduction phase|2. During this phase, CO2 combines with ribulose-1,5-bisphosphate.| |c. Regeneration phase|3. During this phase, the CO2 acceptor ribulose-1,5-bisphosphate is formed again, so that the cycle continues.|

  1. a - 3, b - 1, c - 2

  2. a - 2, b - 1, c - 3

  3. a - 1, b - 2, c - 3

  4. a - 3, b - 2, c - 1

  5. a - 2, b - 3, c - 1


Correct Option: B
Explanation:

 During carboxylation phase, CO2 combines with ribulose-1,5-bisphosphate. During reduction phase, carbohydrate is formed at the expense of the photochemically made ATP and NADPH. During regeneration phase, the CO2 acceptor ribulose-1,5-bisphosphate is formed again, so that the cycle continues.

Which scientist gave the "Law of Limiting Factors" in 1905?

  1. Joseph Priestley

  2. Jan Ingenhousz

  3. Julius von Sachs

  4. T. W. Engelmann

  5. Blackman


Correct Option: D
Explanation:

This is the correct option as Blackman gave the "Law of Limiting Factors" in 1905.

Match the following: Name of the pigments|Colour| |a. Chlorophyll a|1. Yellow-green| |b. Chlorophyll b|2. Yellow| |c. Xanthophylls|3. Bright or blue-green in the chromatogram|

  1. a - 3, b - 1, c - 2

  2. a - 3, b - 2, c - 1

  3. a - 1, b - 2, c - 3

  4. a - 1, b - 3, c - 2

  5. a - 2, b - 1, c - 3


Correct Option: A
Explanation:

This is the correct option. Chlorophyll a is bright or blue-green in the chromatogram. Chlorophyll b is yellow-green in colour. Xanthophyll is yellow in colour.

Which of the following is not included in light reactions or in the 'photochemical' phase?

  1. Water splitting

  2. Formation of high-energy NADPH

  3. Light absorption

  4. Release of ATP

  5. Oxygen release


Correct Option: D
Explanation:

This is the correct option as release of ATP is not included in light reactions. 

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