Back to your test review

Engelmann's experiment with Cladophora gave the first

(a) evidence for the Calvin cycle Your answer
(b) action spectrum of photosynthesis Correct
(c) absorption spectrum of chlorophyll Your answer
(d) evidence that O₂ comes from water Your answer

Your answer: Correct answer: (b)

Advertisement

Explanation

Why (b) is correct

Engelmann's experiment showed where (at which wavelengths) photosynthesis was most active. This was the first action spectrum of photosynthesis.

Why the other options are wrong

(a) · your answer The Calvin cycle was worked out much later, using ¹⁴C.
(c) · your answer An absorption spectrum is measured with a spectrophotometer, not with bacteria.
(d) · your answer That O₂ comes from water was shown by van Niel and isotope studies.

NCERT point: The action spectrum resembles the absorption spectrum of chlorophyll a and b.

Thank you! We will check this question.

Practise Photosynthesis in Higher Plants

Take a free 15-question NEET Biology test on this chapter. Timed, scored instantly.

Start free test

Similar questions

By the middle of the nineteenth century, the overall equation of photosynthesis was written as Cornelius van Niel's studies on purple and green bacteria showed that photosynthesis is essentially a process in which According to van Niel, when the hydrogen donor is H2S, the oxidised product is