Leaf Adaptations to Light Intensity — NEET Biology
📚 Practice ConceptLook at leaves of the same plant on the shady side and compare it with the leaves on the sunny side. Or, compare the potted plants kept in the sunlight with those in the shade. Which of them has leaves that are darker green? Why?
Match the following scientists in Column I with their significant contributions in Column II concerning photosynthesis: Column I (Scientist) A. Joseph Priestley B. Jan Ingenhousz C. Julius von Sachs D. T.W. Engelmann E. Cornelius van Niel Column II (Contribution) i. Showed that sunlight is essential for the plant process that purifies air. ii. Demonstrated that O₂ evolved by green plants comes from H₂O, not from carbon dioxide. iii. Provided evidence for production of glucose when plants grow, stored as starch. iv. Performed experiments revealing the essential role of air in the growth of green plants. v. Described the first action spectrum of photosynthesis using aerobic bacteria. Which of the following is the correct match?
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Correct answer: D — A-iv, B-i, C-iii, D-v, E-ii
This question tests the knowledge of key scientists and their discoveries in the field of photosynthesis as detailed in NCERT Chapter 11. Let's evaluate each pair: A. Joseph Priestley (A) in 1770 revealed the essential role of air in the growth of green plants. This matches with Column II item 'iv'. B. Jan Ingenhousz (B) showed that sunlight is essential for the plant process that purifies the air. He also identified that only green parts release oxygen. This matches with Column II item 'i'. C. Julius von Sachs (C) in 1854 provided evidence for production of glucose when plants grow, which is usually stored as starch. This matches with Column II item 'iii'. D. T.W. Engelmann (D) used a prism to split light and illuminated a green alga with aerobic bacteria to detect O₂ evolution, thus describing the first action spectrum. This matches with Column II item 'v'. E. Cornelius van Niel (E), based on studies of purple and green bacteria, demonstrated that O₂ evolved by green plants comes from H₂O, not from CO₂. This matches with Column II item 'ii'. Therefore, the correct matching is A-iv, B-i, C-iii, D-v, E-ii. Option D correctly represents all the matches. Options B, C, and A contain incorrect pairings. This confirms the understanding of historical milestones in photosynthesis research.
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Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.