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Combined Science: Biology

GCSE · Edexcel · higher

QuestionsFlashcards

Disease
Defence Against Disease
Development of Medicines
- Antibiotics
  4
- Discovery & Development of New Drugs
  6
Non-Communicable Diseases
- Lifestyle & Non-Communicable Disease
  8
- Cardiovascular Disease
  6

The Organism in the Environment
Human Influences on the Environment
- Human Impact on Biodiversity
  6
- Benefits of Maintaining Biodiversity
  6
Cycles within Ecosystems

Light & the Rate of Photosynthesis Flashcards

All 4 cards in this deck

What is the effect of increasing light intensity on the rate of photosynthesis?: The rate increases, then levels off when light intensity ceases to be the limiting factor.
What is the inverse square law for light intensity from a lamp?: light intensity ∝ $\frac{1}{d^2}$ , where d is the distance from the light source (doubling the distance gives a quarter of the light intensity).
Why do commercial growers use artificial lamps in glasshouses?: To raise the light intensity so light is no longer a limiting factor, increasing the rate of photosynthesis and the crop yield.
How is the rate of photosynthesis related to light intensity while light is the limiting factor?: It is directly proportional — doubling the light intensity doubles the rate, until carbon dioxide or temperature becomes the limiting factor.