MCQ Questions are an important part of exams for class 11 Biology and whenever practiced appropriately can help you with getting better marks. CBSE Class 11 Biology MCQ Questions of Photosynthesis in Higher Plants with answers accessible in free here. The MCQ Questions for Class 11 Biology with answers have been ready according to the most recent Syllabus, NCERT books proposed by CBSE.
If you practice these MCQ Questions you will be able to revise all the subtopics that are given beneath: –

• What do we Know?
• Early Experiments
• Where does Photosynthesis take place?
• How many Pigments are involved in Photosynthesis?
• What is Light Reaction?
• The Electron Transport
• Where are the ATP and NADPH Used?
• The C4 Pathway
• Photorespiration
• Factors affecting Photosynthesis

Practice Photosynthesis in Higher Plants Class 11 MCQ Questions, solve the questions and compare your answers with the detailed solutions.

Practice MCQ Questions for class 11 Biology Chapter-Wise

1. The primary carbon dioxide acceptor in C4 cycle is

(a) malic acid
(b) phosphoenol pyruvate
(c) rubisco
(d) aspartic acid

2. Translocation of sugar in flowering plants occurs in the form of

(a) glucose
(b) sucrose
(c) starch
(d) maltose

3. Where are thylakoids and grana located?

(a) Lysosomes
(b) Mitochondria
(c) Chloroplasts
(d) Golgi apparatus

4. Kranz anatomy is a feature of

(a) C3 plants
(b) CAM plants
(c) C4 plants
(d) All of these

5.  How many turns of Calvin cycle yield one molecule of glucose?

(a) Eight
(b) Two
(c) Six
(d) Four

6. In which of the following process, the light energy is converted into chemical energy

(a) Digestive action
(b) Respiration
(c) Photosynthesis
(d) Fermentation

7. Chlorophyll in chloroplasts is located in

(a) Grana
(b) Pyrenoid
(c) Stroma
(d) Both grana and stroma

8. ADP  +  iP  =  ATP in grana is called :–

(a) Phosphorylation
(b) Oxidative phosphorylation
(c) Photophosphorylation
(d) Photolysis

9. Which one occurs both during cyclic and noncyclic modes of photophosphorylation?

(a) Involvement of both PS I and PS II
(b) Formation of ATP
(c) Release of \(O_2\)
(d) Formation of NADPH

10. The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because

(a) a proton gradient forms across the inner mitochondrial membrane. 
(b) There is a change in the permeability of the inner mitochondrial membrane towards adenosine diphosphate (ADP).
(c) high energy bonds are formed in mitochondrial proteins
(d) ADP is pumped out of the matrix into the intermembrane space.

11. The first carbon dioxide fixation product of C4 plant is 

(a) Oxaloacetic acid
(b) ribulose biphosphate
(c) phosphoenol pyruvate
(d) phosphoglyceric acid

12. In blue-green algae, photosystem- II contains important pigments concerned with the photolysis of water. It is a

(a) phycocyanin
(b) cytochrome-c
(c) chlorophyll -b
(d) \(\beta-\)carotene

13. PS-II occurs only in

(a) stroma
(b) granal thylakoids
(c) stromal lamella
(d) matrix

14. The first stable product of the Calvin cycle is 

(a) 3-phosphoglycerate
(b) 1, 3 biphosphoglycerate
(c) glyceraldehyde - 3 phosphate
(d) ribulose - 5- phosphate

15. Quantasomes are present in

(a) chloroplast
(b) golgi body
(c) lysosome
(d) None of these

16. The organelles which take part in photo-respiration are

(a) mitochondria, chloroplast, peroxisome
(b) mitochondria, lysosomes, peroxisome
(c) chloroplast, mitochondria, lysosome
(d) chloroplast, mitochondria, nucleus

17. Photosynthetically active radiation is represented by the range of wavelength of

(a) 400 - 700 nm
(b) 400 - 950 nm
(c) 340 - 450 nm
(d) 500 - 600 nm

18.The first carbon dioxide acceptor in C4 plants is

(a) Phosphoenol-pyruvate
(b) Ribulose 1, 5-diphosphate
(c) Oxalo-acetic acid
(d) None of these

19. In the leaves of C4 plants, malic acid formation during \(CO_2\) fixation occurs in the cells of

(a) mesophyll
(b) phloem
(c) epidermis
(d) bundle sheath

20.Which pigment is water-soluble?

(a) Anthocyanin
(b) Chlorophyll
(c) Carotene
(d) Xanthophyll

21. Formation of ATP in photosynthesis and respiration is an oxidation process which utilizes the energy from

(a) cytochromes
(b) ferredoxin
(c) electrons
(d) carbon dioxide 

22. Which of the following absorb light energy for photosynthesis? 

(a) Chlorophyll
(b) Water molecule
(c) \(O_2\)
(d) RuBP

23. During the synthesis of a glucose molecule, ATP and NADPH consumed are respectively

(a) 12 and 8
(b) 18 and 12
(c) 15 and 12
(d) 30 and 20

24. As compared to a C3-plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C4-plants 

(a) 2 
(b) 6
(c) 12
(d) zero

25. Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants? 

(a) Violet and blue
(b) Blue and green
(c) Green and red
(d) Red and violet

Answer:

 1. Answer: (b) phosphoenol pyruvate

Explanation: In the C4 cycle, phosphoenolpyruvate (PEP) which is a three-carbon molecule act as a primary acceptor of carbon dioxide and is present in the mesophyll cells.

2. Answer: (b) sucrose

Explanation: The sugars, synthesized in leaves (as a result of photosynthesis) are translocated downwards, upwards, and laterally to all the other organs including storage organs mainly through the phloem. These sugars are translocated in the form of sucrose.

3. Answer: (c) Chloroplasts

Explanation: The chloroplast contains chlorophyll within its thylakoids, which absorb light energy and gives chloroplasts its green color. Stacks of thylakoids are known as grana, which exist in the open space of the chloroplast known as the stroma.

4. Answer: (c) C4 plants

Explanation: Kranz anatomy is a unique structure observed in C4 plants. In these plants, the mesophyll cells cluster around the bundle-sheath cell in a wreath formation (Kranz means 'wreath or ring). Also, the number of chloroplasts observed in bundle sheath cells is more than that in the mesophyll cell.

5. Answer: (c) Six

Explanation: Since one molecule of carbon is fixed in one tum of the Calvin cycle. So, six turns of the cycle are required to fix the glucose molecule containing 6 carbon atoms.

6. Answer: (c) Photosynthesis

Explanation: Photosynthesis is the process by which organisms that contain the pigment chlorophyll convert light energy into chemical energy which can be stored in the molecular bonds of organic molecules (e.g., sugars).

7. Answer: (a) Grana

Explanation: In plants, chloroplasts occur in all green tissues, though they are concentrated particularly in the parenchyma cells of the leaf mesophyll. Chloroplasts circulate within plant cells. The green coloration comes from chlorophyll concentrated in the grana of chloroplasts.

8. Answer: (c) Photophosphorylation

Explanation: This process occurs in the grana of the chloroplast during the light reaction. Thus, based on the above information we can conclude that ADP + Pi = ATP in grana is called Photophosphorylation.

9. Answer: (b) Formation of ATP

Explanation:  During the cyclic and noncyclic modes of photophosphorylation, the formation of ATP takes place. The non-cyclic photo-phosphorylation involves PS-I as well as PS-II, while the cyclic photophosphorylation involves PS-1 only.

10. Answer: (a) a proton gradient forms across the inner mitochondrial membrane. 

Explanation: Chemiosmotic phosphorylation is the third pathway that produces ATP from inorganic phosphate and an ADP molecule. This process is a part of oxidative phosphorylation.

11. Answer: (a) Oxaloacetic acid

Explanation: The first product of \(CO_2\) fixation is a C4 organic acid, oxaloacetate, formed by the carboxylation of phosphoenolpyruvate (PEP) by PEP carboxylase. The oxaloacetate is converted to other C4 acids (malate or aspartate) and transferred to the bundle sheath.

12. Answer: (a) phycocyanin

Explanation: In blue-green algae, photosystem-II contains important pigments concerned with the photolysis of water. It is phycocyanin or phycoerythrin.

13. Answer: (b) granal thylakoids

Explanation: Photosystem II mostly occurs in the appressed regions of granal thylakoids.

14. Answer: (a) 3-phosphoglycerate

Explanation: The first stable product of the Calvin cycle is 3-PGA (3-phosphoglyceric acid). It is a 3 carbon compound so the Calvin cycle is also called the C3 cycle.

15. Answer: (a) chloroplast

Explanation: Quantasomes are particles found in the thylakoid membrane of chloroplasts in which photosynthesis takes place. They are embedded in a paracrystalline array on the surface of thylakoid discs in chloroplasts. They are composed of lipids and proteins that include various photosynthetic pigments and redox carriers.

16.Answer: (a) mitochondria, chloroplast, peroxisome

Explanation: Three cellular organelles involved in photorespiration are the chloroplast, peroxisome, and mitochondria.

17. Answer: (a) 400 - 700 nm

Explanation: Photosynthetically Active Radiation (PAR) is the light wavelength range that is best fit for photosynthesis to occur. Photosynthesis is a process that requires light energy and optimally occurs in the 400 to 700 nanometer (nm) range. This range is also known as visible light.

18.Answer: (a) Phosphoenol-pyruvate

Explanation: In C4-plants, phosphoenol-pyruvate is the first acceptor of \(CO_2\) while ribulose bi-phosphate is the second acceptor. Oxalo acetic acid (OAA) is the first product of C4 cycle.

19. Answer: (a) mesophyll

Explanation: In this type of plant, the initial fixation of \(CO_2\) occur in mesophyll cell. The primary acceptor (phosphoenolpyruvate) combines with \(CO_2\) to form oxaloacetic acid which later reduced to malic acid. Malic acid is then translocated to bundle sheath cell for further decarboxylation.

20. Answer: (a) Anthocyanin

Explanation: Anthocyanins are present in vacuoles of the plant cells and are water-soluble pigments. These pigment's molecules change color depending on the pH of their environment, they can be red, purple, blue, or black.

21. Answer: (c) electrons

Explanation: Formation of ATP in photosynthesis and respiration is an oxidation process which utilities the energy from electrons.

22. Answer: (a) Chlorophyll

Explanation: Chlorophyll, the primary pigment used in photosynthesis, reflects green light and absorbs red and blue light most strongly. In plants, photosynthesis takes place in chloroplasts, which contain chlorophyll.

23. Answer: (b) 18 and 12

Explanation: The requirement of ATP and NADPH is respectively. For the synthesis of a molecule of glucose, 18 ATP, 12 NADPH and \(6CO_2\) are required.

24. Answer: (c) 12

Explanation: 18 ATP molecules are required by C3-plants for the synthesis of one molecule of hexose sugar while 30 ATP molecules are needed by the C4 -plants for the same. Thus C4 -plants have a need of 12 ATP molecules extra than C3 -plants for the synthesis of one molecule of hexose sugar.

25. Answer: (a) Violet and blue

Explanation: Carotenoids of higher plants are fat soluble compound that includes carotenes and xanthophylls. Most of them absorb light of voilet and blue range. Green light is absorbed in less amounts.

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