Question

Select the correct sequence of experiments that led to gradual understanding of photosynthesis in green plants.

• A. Production of glucose $\rightarrow$ role of air $\rightarrow$ release of oxygen $\rightarrow$ absorption spectra of chlorophyll a and b
• B. Absorption spectra of chlorophyll a and b $\rightarrow$ production of glucose $\rightarrow$ release of oxygen $\rightarrow$ role of air
• C. Role of air $\rightarrow$ release of oxygen $\rightarrow$ production of glucose $\rightarrow$ absorption spectra of chlorophyll a and b
• D. Release of oxygen $\rightarrow$ production of glucose $\rightarrow$ absorption spectra of chlorophyll a and b $\rightarrow$ role of air

Hint:

Historical order of photosynthesis discovery: Air role $\rightarrow$ Oxygen release $\rightarrow$ Food production $\rightarrow$ Chlorophyll absorption study.

Answer 1

The Correct Option is C

Step 1: Frame the question.
We need the historical order in which the key facts about photosynthesis were discovered.
Step 2: First milestone.
Early workers like Priestley and Ingenhousz studied the role of air, showing plants purify the air. So the story begins with role of air.
Step 3: Second milestone.
Next it was shown that green plants release oxygen during photosynthesis. So release of oxygen comes second.
Step 4: Third milestone.
Later it was found that photosynthesis produces glucose as stored food. So production of glucose comes third.
Step 5: Fourth milestone.
Finally the absorption spectra of chlorophyll a and b were worked out. So this comes last.
Step 6: Match and conclude.
The chain role of air to release of oxygen to production of glucose to absorption spectra matches option 3.
\[ \boxed{\text{Role of air} \rightarrow \text{Oxygen} \rightarrow \text{Glucose} \rightarrow \text{Absorption spectra}} \]