A Level Biology

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Across
  1. 2. gradual development, from a simple to more complex
  2. 5. breeding example for two traits
  3. 7. ions diffuse from high to low concentration
  4. 9. energy currency
  5. 11. muscle fiber and synapse
  6. 14. plant growth regulators
  7. 16. absorbance of different wavelengths of light by a pigment
  8. 17. no resulting effect on an altered chromosome
  9. 18. control of the water potential of body fluids
  10. 19. pathway along which impulse transmits from receptor to effector
  11. 20. electron flow in cyclic photophosphorylation
Down
  1. 1. degree of variation of life forms in an ecosystem
  2. 3. used in electron transport chain
  3. 4. process of removing small molecules out of blood into bowman's capsule
  4. 6. cranial and spinal nerves
  5. 8. rate of photosynthesis at different wavelengths of light
  6. 10. regions of DNA that don't code for anything
  7. 12. movement of ions across a membrane, down the electrochemical gradient
  8. 13. electrical difference inside neuron is much lower than outside
  9. 15. mechanisms to keep factors within narrow limits