Factors Affecting Photosynthesis Rate — NEET Biology
📚 Practice ConceptAn understanding of the factors that affect photosynthesis is necessary. The rate of photosynthesis is very important in determining the yield of plants including crop plants. Photosynthesis is under the influence of several factors, both internal (plant) and external. The plant factors include the number, size, age and orientation of leaves, mesophyll cells and chloroplasts, internal CO₂ concentration and the amount of chlorophyll. The plant or internal factors are dependent on the genetic predisposition and the growth of the plant.
Which of the following statements are correct regarding the internal factors influencing the rate of photosynthesis? S1: Plant factors, including leaf age and orientation, are largely determined by the genetic predisposition and overall growth of the plant. S2: The number of chloroplasts, internal CO₂ concentration, and amount of chlorophyll are all classified as internal factors that affect photosynthesis. S3: Chloroplasts within the mesophyll cells are typically aligned such that they receive an optimum quantity of incident light. S4: Older leaves consistently exhibit a higher rate of photosynthesis compared to younger, expanding leaves due to a more developed vascular system. S5: While plant factors influence the rate of photosynthesis, their impact is generally less significant than that of external factors.
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