GCSE biology definitions

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Across
  1. 1. A long cytoplasmic extension of the cell body of a neuron. It serves to transmit impulses.
  2. 5. A group of similar organisms that can breed, producing healthy offspring that are able to grow, develop and reproduce normally
  3. 6. The process in which light energy absorbed by chlorophyll is transformed into chemical energy.
  4. 9. cell division such that the daughter cell produced contains the same number of chromosomes as the parent cel
  5. 10. The sudden or spontaneous change in gene structure or a chromosome, or even the chromosome number, and may be inheritable.
  6. 11. The observable characteristics of an organism
  7. 13. glands Ductless glands that secrete hormones into the bloodstream.
  8. 16. A chemical substance produced in minute quantities by an endocrine gland. It is transported in the bloodstream to target organ(s) where it exerts its effects.
  9. 17. The control of water and solute levels in the blood to maintain a constant water potential in the body. Basically to maintain blood water levels.
  10. 19. The combination of alleles that control each characteristic
  11. 21. The net movement of water molecules from a solution of higher water potential to a solution of lower water potential, through a partially permeable membrane, i.e. down a water potential gradient.
Down
  1. 2. The adjustment of the lens of the eye so that clear images of objects at different distances are formed on the retina.
  2. 3. The oxidation of food substances with the release of energy in living cells
  3. 4. The process of converting harmful substances into harmless ones in the body
  4. 7. The loss of water vapour from aerial parts of a plant, especially through the stomata of the leaves.
  5. 8. Made of protein. They alter the rate of (mostly catalyse) chemical reactions without themselves being chemically changed at the end of the reactions.
  6. 12. The transport of manufactured food substances such as sugar and amino acids in plants (in phloem.)
  7. 14. A collection of nerve fibres
  8. 15. The process by which metabolic waste products and toxic materials are removed from the body of an organism.
  9. 18. Cells that contain the full number of chromosomes
  10. 20. A group of similar cells which work together to perform a specific function