Q.
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a
Joseph Priestley – Hypothesized that plants restore to the air whatever breathing animals and burning candles remove
b
Jan Ingenhousz – Showed the release of oxygen from green parts of the plant only in the presence of light
c
Sachs – Showed that green substance of plants is present in chloroplasts
d
Engelman – Did experiments by using photosynthetic bacteria.
answer is 4.
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