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Joseph Priestley is also credited with the discovery of

(a) oxygen Correct
(b) carbon dioxide Your answer
(c) chlorophyll Your answer
(d) the chloroplast Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

Priestley is credited with the discovery of oxygen (1774), following his bell-jar experiments.

Why the other options are wrong

(b) · your answer CO₂ was not discovered by Priestley.
(c) · your answer Chlorophyll was named and isolated later by other scientists.
(d) · your answer Priestley did not discover the chloroplast.

NCERT point: Priestley's work started the study of gas exchange in plants.

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