CBSE Class 11 Photosynthesis in Higher Plants Worksheet A

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Photosynthesis in Higher Plants

MULTIPLE CHOICE QUESTIONS

Question. In photosynthesis, splitting of water and release of oxygen occurs during 
(a) photolysis
(b) red drop
(c) Pasteur effect
(d) Calvin cycle
Answer. A

Question. Blackman’s law of limiting factor is applied to 
(a) respiration
(b) transpiration
(c) photorespiration
(d) photosynthesis
Answer. D

Question. Hill reaction occurs in
(a) high altitude plants
(b) total darkness
(c) absence of water
(d) presence of ferricyanide
Answer. A

Question. Select the incorrect statement 
(a) C₄ pathway for CO₂ fixation were discovered by Hatch and Slack
(b) CO₂ is essential for photosynthesis
(c) Addition of sodium carbonate in water retards photosynthetic rate in vallisneria
(d) Phloem is the principal pathway for translocation of solutes
Answer. C

Question. The family in which many plants are C₄ type
(a) Malvaceae
(b) Solanaceae
(c) Crucifereae
(d) Graminae
Answer. D

Question. Which one does not differ between a C₃ and a C₄ plant? 
I. Initial CO₂ acceptor.
II. Extent of photorespiration.
III. Enzyme catalyzing reaction that fixes CO₂.
IV. Presence of Calvin cycle.
V. Leaf anatomy.
(a) I and V
(b) IV
(c) II and III
(d) II
Answer. B

Question. The total requirement of ATP & NADPH for each molecule of CO2 fixed & reduced in photosynthesis in the Calvin cycle is 
(a) 2 ATP & 2 NADPH
(b) 2 ATP & 3 NADPH
(c) 3 ATP & 2 NADPH
(d) 4 ATP & 3 NADPH
Answer. C

Question. Consider the following statements regarding photosynthesis.
(A) ATP formation during photosynthesis is termed as photophosphorylation.
(B) Kranz anatomy pertains to leaf.
(C) Reduction of NADP+ to NADPH occurs during Calvin cycle.
(D) In a chlorophyll molecule, magnesium is present in phytol tail. Of the above statements 
(a) A and B are correct
(b) C and D are correct
(c) A and C are correct
(d) A and D are correct
Answer. A

ASSERTION REASON QUESTIONS

Directions  : These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following five responses.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
(e) If the Assertion is incorrect but the Reason is correct.

Question. Assertion: C₄ pathway of CO₂ fixation is found in some tropical plants.
Reason: In this pathway, CO₂ is fixed by 3C compound. 
Answer. B

Question. Assertion : Mitochondria helps in photosynthesis
Reason : Mitochondria have enzymes for dark reaction.
Answer. D

Question. Assertion: Bacterial photosynthesis occurs by utilizing wavelength longer than 700 nm.
Reason: Here reaction centre is B-890. 
Answer. B

Question. Assertion : Rhoeo leaves contain anthocyanin pigments in epidermal cells.
Reason : Anthocyanins are accessory photosynthetic pigments.
Answer. C

Question. Assertion : Cyclic pathway of photosynthesis first appeared in some eubacterial species.
Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved. 
Answer. B

Question. Assertion : C₄ photosynthetic pathway is more efficient than the C₃ pathway.
Reason : Photorespiration is suppressed in C₄ plants. 
Answer. A

Question. Assertion : The atmospheric concentration of CO₂ at which photosynthesis just compensates for respiration is referred to as CO₂ compensation point.
Reason : The CO₂ compensation point is reached when the amount of CO₂ uptake is less than that generated through respiration because the level of CO₂ in the atmosphere is more than that required for achieving CO₂ compensation point. 
Answer. C

Question. Assertion : Under conditions of high light intensity and limited CO₂ supply, photorespiration has a useful role in protecting the plants from photo-oxidative damage.
Reason : If enough CO₂ is not available to utilize light energy for carboxylation to proceed, the excess energy may not cause damage to plants.
Answer. C

Question. Assertion : Photosynthetically C₄ plants are less efficient than C₃ plants. 
Reason : The operation of C₄ pathway requires the involvement of only bundle-sheath cells.
Answer. D

Question. Assertion : Dark reaction is purely enzymatic reaction. 
Reason : It occurs only in absence of light.
Answer. E

Directions : Each of these questions contains an Assertion followed by Reason. Read them carefully and answer the question on the basis of following options. You have to select the one that best describes the two statements.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.

Question. Assertion: Six molecules of CO₂ and twelve molecules of NADPH⁺ + H⁺ and 18 ATP are used to form one hexose molecule.
Reason: Light reaction results in formation of ATP and NADPH2.
Answer. B

Question. Assertion : Amaranthus and sugarcane are called as Hatch & Slack plants.
Reason : One glucose is formed by fixation of 6 CO₂ in the plants. 
Answer. B

Question. Assertion : Dark reaction occurs only at night in the stroma of chloroplast.
Reason : CO₂ fixation occurs only during C₃ cycle.
Answer. D

Question. Assertion : D.C.M.U. is a photosynthetic inhibitor. 
Reason : D.C.M.U. inhibits a photolysis of water.
Answer. A

Question. Assertion: The stromal thylakoids are rich in both PS I and PS II.
Reason: The stroma membranes are rich in ATP synthetase. 
Answer. D

Question. Assertion : Cyclic pathway of photosynthesis first appeared in some eubacterial species.
Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved. 
Answer. B

Question. Assertion : Each molecule of ribulose-1,5-bisphosphate fixes one molecule of CO₂.
Reason : Three molecules of NADPH and two ATP are required for fixation of one molecule of CO₂.
Answer. C

1. Expand NADP.

2. Name one plant that carries out photosynthesis at night?

3. Name the cell – organelles involved in photorespiration.

4. What is red Drop?

5. What are the enzymes that catalyze the dark reaction of carbon fixation located?

6. What are the two main functions of pigments other than chlorophyll in green leaves?

7. Explain -There is no oxygen evolution in bacterial photosynthesis.

8. What is the advantage of using chlorella rather than a higher plant?

9. (a) suggest some habitats or natural circumstances in which

(i) Light intensity

(ii) CO₂ concentration

(iii) temperature might be limiting factors in photosynthesis.

(b) In C₄ plants which type of chloroplast is specialized for light reactions and which for dark reactions?

(c) Why is it an advantage that bundle sheath chloroplast lack grana? 

Click on link below to download CBSE Class 11 Photosynthesis in Higher Plants Worksheet A.