Limiting Factors of Photosynthesis — NEET Biology
📚 Practice ConceptFor example, despite the presence of a green leaf and optimal light and CO₂ conditions, the plant may not photosynthesise if the temperature is very low. This leaf, if given the optimal temperature, will start photosynthesising.
Which of the following statements correctly illustrate the application or principles of Blackman’s Law of Limiting Factors in photosynthesis? S1: If the light intensity is significantly below saturation, an increase in atmospheric CO₂ concentration will lead to a proportional increase in the rate of photosynthesis. S2: The phenomenon where the rate of photosynthesis eventually plateaus despite continuous increases in light intensity exemplifies Blackman's Law. S3: For C₃ plants, increasing temperature beyond their optimum (20-25°C) will always enhance photosynthesis if CO₂ levels are kept high. S4: In conditions of severe water scarcity, providing optimal light and CO₂ will not significantly increase photosynthesis, as water availability becomes the primary limiting factor. S5: Blackman’s Law is only applicable to external environmental factors and does not account for internal plant factors like chlorophyll content.
Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.