Importance of a factor in photosynthesis

Plant Physiology (10)

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow:

1. Name the factor studied in this experiment.
2. What will you observe in the experimental leaf after the starch test?
3. Explain the process of Photosynthesis.
4. Give a balanced chemical equation to represent the process of photosynthesis.
5. Draw a neat, labelled diagram of an experimental setup to show that oxygen is released during photosynthesis.

Answer

(i) Sunlight

(ii)

• Part of leaf covered by black paper turns brown, absence of starch.
• Parts of leaf exposed to sunlight turns blue black, presence of starch.

(iii) Plant cells having chlorophyll, use water and carbon dioxide to produce glucose in the presence of sunlight.

(iv) 6CO₂ + 12H₂O → C₆H₁₂O₆ + 6H₂O + 6O₂

(v) 

• Exam Year: 2019