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Match the scientists in List I with their contributions in List II.
| List I | List II |
| P. Joseph Priestley | 1. Sunlight needed for purification of air |
| Q. Jan Ingenhousz | 2. Glucose stored as starch |
| R. Julius von Sachs | 3. First action spectrum |
| S. T.W. Engelmann | 4. Plants restore air spoilt by a candle |
Your answer:
Correct answer: (a)
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Explanation
Why (a) is correct
Priestley: plants restore air spoilt by a candle (4); Ingenhousz: sunlight needed for purification of air (1); Sachs: glucose stored as starch (2); Engelmann: first action spectrum (3). So P-4, Q-1, R-2, S-3.
Why the other options are wrong
- (b) · your answer This swaps Ingenhousz and Sachs.
- (c) · your answer This swaps Priestley and Ingenhousz.
- (d) · your answer This swaps Priestley and Engelmann.
NCERT point: History of photosynthesis: Priestley → Ingenhousz → Sachs → Engelmann → van Niel → Calvin.
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