Daily Practice Problems Photosynthesis In Higher Plants

Question 1:

Choose the correct options:

1. The site of photosynthesis in higher plants is:

(a) Plastid

(b) Chromoplast

(d) Leucoplast

2. Which among the following metal ions forms the constituent of the green pigment found in higher plants?

(a) Iron

(b) Zinc

(d) Magnesium

3. The complex association with splitting of water is present in:

(a) PS I

(b) PS I and PS II

(d) Inner surface of thylakoid membrane

4. In which among the following pathways the first stable compound formed is a 4-carbon compound?

(a) Photorespiration

(b) Calvin cycle

(d) All of the above

Question 2:

Name the following:

1. A stack of thin disc-like structures present in the chloroplasts.

2. The site of dark reaction in plants.

3. The splitting of water molecules in presence of light.

4. The primary acceptor of CO₂ molecules in the Calvin Cycle.

5. The specialised large cells present around the vascular bundles of C₄plants.

Question 3:

Fill in the blanks with appropriate words:

1. The graph depicting the rate of photosynthesis at different wavelengths of light is called ___________.

2. ____________ is the process of formation of ATP in the presence of light.

3. The steps of Calvin cycle can be broadly classified as ___________, ___________ and ___________.

4. ___________ is a light-dependent phenomenon in which oxygen is consumed and carbon dioxide is liberated by the photosynthetic parts of the plant.

5. The formation of one glucose molecules requires ___________ turns of Calvin cycle.

Question 4:

Complete the given analogies by observing the relation between the first two words and then filling an appropriate word at the fourth place:

1. Photophosphorylation : Photochemical phase :: CO₂ fixation : __________

2. C₃ Cycle : RuBisCO :: C₄ Cycle : __________

3. Granal chloroplasts : Mesophyll cells :: Agranal chloroplasts : __________

4. Photosystem I : P₇₀₀ :: Photosystem II : __________

5. Calvin Cycle : RuBP :: Hatch & Slack Cycle : ___________

Question 5:

State the contributions of the following scientists:

1. T.W. Englemann

2. Cornelius van Niel

3. Melvin Calvin

4. Blackman

5. Ingenhousz

Question 6:

Define the following terms:

1. Light reaction

2. Photorespiration

3. Photolysis

4. Chemiosmosis

5. Non-cyclic photophosphorylation

Question 7:

State whether the following statements are true or false.

1. The principle of limiting factor was put forth by Engelmann.

2. The reaction centre in PS I is P_680.

3. The fixation of carbon dioxide takes place in the light-independent phase of photosynthesis.

4. The number of ATPs required for synthesis of one glucose molecule in C₃ pathway is 18.

5. Agranal chloroplasts are seen in bundle sheath cells.

Question 8:

Match the columns A and B.

Column A	Column B
1. Kranz anatomy	a. Electron acceptor
2. Peroxisome	b. C₄ plants
3. Cytochrome	c. Light reaction
4. Carboxylation	d. Photorespiration
5. Photolysis	e. RuBisCO

Question 9:

Expand the following abbreviations:

1. PEP

2. RuBP

3. PGA

4. RuBisCO

5. NADP

Question 10:

Draw a neat labelled diagram of the ultrastructure of chloroplast.

Question 11:

Differentiate between light and dark reaction.

Question 12:

How is photosystem I different from photosystem II?

Question 13:

What is the significance of photolysis of water during light reaction?

Question 14:

Draw a schematic representation of the ‘Z-scheme of light reaction’.

Question 15:

Briefly explain the chemiosmotic hypothesis.

Question 16:

Why is Calvin cycle called C₃ cycle? Briefly describe its steps.

Question 17:

Name any two C₄ plants. State the special anatomical features found in the leaves of such plants.

Question 18:

What are the conditions under which RuBisCO acts as an ‘oxygenase’ enzyme?

Question 19:

State any six differences between C₃and C₄ pathway of carbon dioxide fixation.

Question 20:

State Blackman’s Law of Limiting factors? Also explain how is the rate of photosynthesis affected by the temperature.

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