Across
- 3. the structural component of cell walls that sugar produced during photosynthesis can be converted into
- 5. process by which green plants convert light energy into chemical to make their own food
- 6. a type of mutagenic agent
- 8. natural control of pests using natural predators and parasites
- 10. process which ensures the best adapted individuals survive to reproduce (survival of the fittest)
- 12. brown coloured solution that turns blue/black in the presence of starch
- 13. chemicals used to kill organisms that damage or feed on crop plants
- 14. formation of two or more species from one original species
- 19. sugar produced during photosynthesis can be used straight away for this
- 20. a random, spontaneous change in genetic composition that is the only source of new alleles
- 22. a factor that increases the rate at which mutations can occur
- 25. plant cell structure where photosynthesis occurs
- 26. another word for poison level
- 28. this is an example of a limiting factor of photosynthesis
- 30. sugar produced during photosynthesis can be converted into this for storage
- 31. different versions of the same gene
- 32. plants uptake nitrogen in this form to produce amino acids
- 33. these crops can be used to reduce the use of fertilisers
Down
- 1. when a mutation has neither an advantageous or disadvantageous effect on an organism
- 2. an organisms is said to have this if they possess favourable characteristics that increase their chance of survival
- 4. rapid increase of algal numbers in water
- 7. comes from the first stage of photosynthesis and combines with carbon dioxide in the second stage to produce sugar
- 9. name of the first stage of photosynthesis
- 11. barrier that prevents interbreeding and gene exchange between sub-populations of a species
- 15. plants need nitrogen in order to make this for growth
- 16. name of the second stage of photosynthesis
- 17. name given to variables that, when in short supply, can limit the rate of chemical reactions such as photosynthesis
- 18. build up of toxic substances in living organisms
- 21. chemical added to the soil to improve plant growth or crop yield. Increases soil nitrate.
- 23. group of organisms that can interbreed to produce fertile offspring
- 24. this is an example of a selection pressure
- 25. green pigment in chloroplasts that absorbs light energy for the process of photosynthesis
- 27. the waste product from the first stage of photosynthesis
- 29. an inherited characteristic that increases an organism's chance of survival in it's environment