Light Intensity & Chlorophyll Breakdown — NEET Biology
📚 Practice ConceptIncident light beyond a point causes the breakdown of chlorophyll and a decrease in photosynthesis.
Assertion (A): Excessive light intensity can be harmful to photosynthesis. Reason (R): Increase in incident light beyond a point causes breakdown of chlorophyll and decrease in photosynthesis.
View solution & NCERT explanation
Correct answer: A — If both assertion and reason are true and the reason is the correct explanation of the assertion.
NCERT confirms excessive light can harm photosynthesis (Assertion true). NCERT explicitly states “Increase in incident light beyond a point causes the breakdown of chlorophyll and a decrease in photosynthesis” - the Reason explains WHY excessive light is harmful (chlorophyll breakdown mechanism). Both are true and Reason provides the causal explanation for Assertion.
What does NCERT say about Incident light beyond point?
Has this concept appeared in NEET?
Which chapter is this from?
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.