Biology Crossword

1. the loss of water vapour from a plant to its environment, by diffusion down a water potential gradient; most transpiration takes place through the stomata in the leaves
4. a plant growth regulator (plant hormone) that stimulates cell elongation
7. the variety of ecosystems and species in an area and the genetic diversity within species
8. an illness in which the pancreas does not make sufficient insulin, or where cells do not respond appropriately to insulin
9. a hormone secreted by the adrenal glands in times of stress or excitemen
11. a change in the environment that is detected by a receptor, and which may cause a response
12. protection against infectious diseases, gained either actively or passively
14. a device that uses a biological material such as an enzyme to measure the concentration of a chemical compound
15. enzymatic release of energy from organic compounds in living cells
17. a green pigment responsible for light capture in photosynthesis in algae and plants
18. a haploid cell specialised for fertilisation
19. the probability of an organism surviving and reproducing in the environment in which it is found

2. a lipid whose molecules are made up of a glycerol molecule and three fatty acids
3. damage to the brain caused by bursting or blockage of an artery
5. a nitrogenous excretory product produced in the liver from the deamination of amino acids
6. a length of DNA that codes for a particular protein or polypeptide
8. the net movement of molecules or ions from a region of higher concentration to a region of lower concentration down a gradient, as a result of the random movements of particles
10. nitrogen-containing purine base found in DNA and RNA
13. having two identical alleles of a gene
16. tissue containing sieve tubes and other types of cell, responsible for the translocation of assimilates such as sucrose through a plant