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Across 5. a change in an organism's environment that can be detected by sense organs 6. the stage of a heart beat in which the muscles of the heart relaz 15. narrowing of blood vessels 16. an action by an organism or part of an organism causing a change in position 19. the movement of sucrose and amino acids in phloem, from regions of production to regions of storage 20. the removal from organisms of the waste products of metabolism, toxic substances and substances in excess of requirements 21. the change in adaptive features of a population over time, as a result of natural selection 23. having two different alleles of a gene (Gg) 24. an organelle found in some plant cells, which contains chlorophyll and where photosynthesis takes place 27. the main nitrogenous excretory product of mammals, produced in the liver from excess amino acids 28. the fusion of the nuclei of two gametes 32. the net movement of molecules from an area of low concentration to an area of high concentration 34. the movement of digested food molecules into the cells of the body where they are used, becoming part of the cells 35. having two identical alleles of a gene (gg or GG) 37. a soluble protein that is converted to insoluble fibrin when blood clots 38. having one set of chromosomes 41. any of two or more alternative forms of a gene 43. an organism that gets its energy by feeding on other organisms 44. the ability to detect or sense changes in the environment and to make appropriate responses 48. one of the thousands of tiny tubules in a kidney, in which urine is produced 50. a hormone secreted by the ovariesthat helps to control the menstrual cycle 52. the coloured part of the eye, which controls the amount of light allowed through the lens to the retina 53. the polysaccharide that is used an an energy store in animal cells 54. a structure made up ofa grop of tissues, working together to perform body functions 55. a large organelle in which chromosomes are found 56. a plant hormone which causes cells to elongate 57. the young root in an embryo plant 58. a cell that is able to detect changes in the environment; often part of a sense organ

Down 1. an insoluble protein that forms fibres that help in blood clotting 2. in mammals, an organ made up of tissues of both the mother and embryo, thorugh which the mother's and embryo's bodies exchange nutrients and waste materials 3. a polysaccharide carbohydrate which forms fibres and is found in the cell walls of plant cells 4. a protease enzyme found in the stomach 5. tiny gaps between two guard cells, usually on the lower epidermis of a leaf 6. when the enzyme's active site has changed shape so much the substrate can no longer fit into it 7. a green, light-absorbing pigment found in chloroplasts in plant cells 8. a change in a gene or a chromosome 9. organelles in whcih aerobic respiration takes place, releasing energy for the use by the cell 10. widening of blood vessels 11. the passing out of food that has not been digested, as faeces, through the anus 12. a plant adapted to live in dry conditions 13. the change in the shape of the lens, in order to focus on objects at different distances 14. an allele that is only expressed when there is no dominant allele of the gene present 17. evaporation of water at the surfaces of mesophyll cells followed by loss of water vapour form plant leaves, through the stomata 18. rhythmic contractions of muscles that ripple along a tube (pushes food thorugh alimentary canal) 22. a hormone secreted by the pancreas, which increases blood glucose level 25. food storage structures in a seed 26. tiny extensions on the surface of a cell, which wave in unison and cause fluids to move 29. a drug that makes the nervous system work faster 30. a space inside an ovary in which an egg develops 31. the chemical reactions in cells that break down nutrient molecules and release energy 33. the introduction to the body of dead or weakened pathogens, to make a person immune to an infectious disease 36. a liquid made in the liver, stored in the gall bladder and emptied into the small intestine, where it helps to emulsify fats 39. an allele that is experessed if present 40. a plant response to a stimulus 42. the diploid cell produced when two gametes fuse 45. an animal that kills and eats other animals 46. the part of a flower that recieves pollen 47. the stage of a heart beat in which the muscles in the walls of the heart chambers contract 49. the movement of water from a reagion of high water potential to an area of low water potential through a partially permeable membrane 51. a group of cells with similar structures, working together to perform a shared function