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Across 2. acid accumulated in muscles of animals during hard work 5. which blood cell help in gaseous transport 7. process similar to respiration which involve oxidation of substances without enzymes outside the cell. 8. it is common path for air and food passage 9. which part of plants exchange gases through general body surface. 10. external nare open in a space having mucus and hairy wall which help to warm the air, filter the dust particles 12. breathing organs in insects 14. breathing organ of fishes 15. respiration in presence of oxygen. 17. cells that regulate opening and closing of stomata 20. stucture by which plants exchange gases in leaves 21. energy currency of cell 23. second step of respiration, oxygen dependent, occur in mitochondria 24. smallest unit in lungs which help in gaseous exchange 25. respiration in absence of oxygen 29. part of respiration occur inside the cell (actual respiration) 30. how many ATP are produced by aerobic oxidation of glucose molecule 31. which cell organelle help in respiration. 32. how many ATP are produced by anaerobic oxidation of food 33. stucture by which plants exchange gases in stem 34. universal pathway of respiration which produce only 2 ATP in anaerobic and 8 ATP in aerobic respiration

Down 1. CO2 combine with haemoglobin and form 3. tracheal incomplete cartilagenous rings are similar to a which english alphabet. 4. which alcohol is produced by anaerobic oxidation. 6. trachea divided into smaller parts called 11. what is other end product of aerobic respiration with water 13. negatively geotrophic, roots of mangroove plants are called 16. exchange of gases with external atmosphere and body (lungs) 18. step of respiration which produce pyruvate as end product 19. process having anaerobic oxidation in yeast which produce many useful product 22. earthworm respire by 26. first step of glucose breakdown which do not require oxygen 27. oxidation of food 28. it contain vocal cords which help in producion of sounds 32. how many ATP are produced during respiration in muscles during exercise