Biology Important Questions: Photosynthesis

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1 Mark Questions

Fill in the blanks:

1. Cyclic photophosphorylation occurs when only light of ________ wavelength is available.

2. In chlorophyll molecule, the porphyrin ring has metal atom _______ in the centre.

3. All pigments except ________ are called accessory pigments.

4. Visible light has wavelength ranging from _______ to _______.

5. Chl. a and b have the same structure except chl.a has ______ group, while chl.b has _____ group in the side chain.

6. C4 plants show _______ type of leaf anatomy.

7. The enzyme that accepts O2 during photorespiration is _______.

8. Mesophyll Chloroplast of C4 plants have higher concentration of _______ enzyme.

Answer the following in one sentence :

1. Which molecule in non-cyclic photophosphorylation donates electrons to PSII ?

2. Expand PEP Case.

3. Why NADP + H+ is not synthesized during cyclic photo-phosphorylation?

4. Who gave the law of limiting factors?

5. Name the two photosynthetic pigments belonging to carotenoids.

6. Give the chemical equation of photosynthesis.

7. What is the first stable product of C4 cycle?

8. Which is the primary acceptor molecule of CO2 during the calvin cycle?

9. Expand RuBisCO.

10. Name the reaction centre in PSI & PSII.

11. What is plastidome?

2 Marks Questions

Answer the following :

1. Match the column I with Column II

  Column I   Column II
1. Kalanchoe a. Photoautotroph
2. Amaranthus b. CAM plant
3. Chromatium c. Chemoautotroph
4. Nitrosomonas d. Kranz Anatomy

2. How does light intensity affect the rate of photosynthesis?

3. Why do the C4 plants show better yield and high productivity than C3 plants?

4. What is the net consumption of ATP and NADPH2 for every CO2 molecule fixed in C4 plants?

5. Give diagrammatic representation of cyclic photophosphorylation.

6. What are accessory pigments ? Give their role in photosynthesis.

7. Do ‘dark reaction’ of photosynthesis need light? Explain.

8. CAM plants keep their stomata closed during the day to check transpiration. How do they fix CO2?

3 Marks Questions

Answer the following :

1. Distinguish between
a) Cyclic photophosphorylation and Non cyclic photophosphorylation.
b) Bundle sheath chloroplast and Mesophyll chloroplast
c) C3 pathway and C4 pathway.

2. a) What is the absorption spectrum?
b) Which pigment forms reaction centre?

3. Where does carboxylation take place in C3 plants? Explain the process.

4. Give an account of external factors affecting photosynthesis.

5. What is PEPA? What is its role in the biosynthetic phase?

6. Why does the rate of photosynthesis decrease at high temperature ? Give reason ‘chloroplast is said to be semi-autonomous cell organelle.

5 Marks Questions

1. Mention the site of occurrence of the following events in sugarcane leaf.
a) Regeneration of RUBP.
b) RUBP + CO2 → 3PGA.
c) PEPA + CO2 → OAA
d) 4C acid formation
e) 3C acid formation.

2. a) State the requirements of Chemiosmosis.
b) Mention the features of bundle sheath cells associated with Kranz anatomy.

3. a) Mention the photosystems and other components involved in non-cyclic photophosphorylation.
b) Name the components involved in cyclic ETS.
c) Which is the major limiting factor for photosynthesis?
d) Which abiotic factor affects the photosynthesis indirectly?
e) Who postulated chemiosmotic hypothesis?

4. How are C4 plants more efficient than C3 plants? Explain the fixation of CO2 in C4 plants.

5. a) Why photorespiration is not seen in C4 plants?
b) Which is the most abundant enzyme in the world?
c) Explain the anatomical features found in the leaves of C4 plants with a diagram.

6. Why RuBisCo enzyme more appropriately called RuBP carboxylase – Oxygenase and what role does it play in photosynthesis?

7. Which property of photosynthetic pigments is responsible for its ability to initiate the process of photosynthesis? Why the rate of photosynthesis is higher in the red and blue regions of the spectrum of light?

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One Comment

  1. Answer in one sentence
    Water moelcule ( OH -) donates electron to PSII

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