National 5 Based Crossword

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Across
  1. 3. A protein found in red blood cells that carries oxygen.
  2. 4. Humans have 46 of these in the nucleus.
  3. 5. The movement of food along the gut.
  4. 8. A negative human impact on biodiversity.
  5. 10. Another name for carbon fixation.
  6. 14. The species who's presence or absence indicate the level of pollution.
  7. 17. The artery that supplies the heart muscle with its own blood supply.
  8. 18. The gene that masks the appearance of another.
  9. 19. 'Skin' of the leaf which is water proof and contains stoma.
  10. 21. Photosynthesis is an ___________ controlled process.
Down
  1. 1. It is the sequence of _______ that determine the sequence of amino acids and therefore the protein structure.
  2. 2. The competition that occurs between different species.
  3. 6. To increase yield, farmers use methods like intensive farming, pesticides and what?
  4. 7. The type of bacteria that converts ammonium compounds into nitrites and then nitrates.
  5. 9. The part of the brain that controls balance and co-ordination.
  6. 11. The site of chemical reactions.
  7. 12. Trachea and bronchi are held open by this.
  8. 13. Transports sugar up and down the plant.
  9. 15. All of the species living together.
  10. 16. The fibres from the poles that attach to the centromere and pull chromatids to opposite poles during mitosis.
  11. 20. A resource that animals compete for.