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Across
1.in this, a few organisms, such as certain bacteria and yeast, release energy from food in the absence of oxygen
6.within lungs bronchi branch out into many ............
7.respiratory organs in terrestrial organisms
10.the pouches like air sacs at the ends of the smallest bronchioles are called .......
11....................... represents ..............
15.THE EQUATION food+oxygen-------> carbon dioxide+water+energy represents which life process?
16.upper end of trachea has voice box called ..........
17.gas important for human survival
Down
2.one of the by-products of respiration
3............. secreted by the glands inside nasal cavity
4.entry point of air into the body
5............... are the respiratory organs in insects like grasshopper, cockroach and housefly
8.respiratory organs of acquatic animals
9.pores where exchange of gases between the air and the cells of the leaves takes place
12.in this, food is completely broken down into carbon dioxide and water by oxidation
13.when we breathe in air the ............and the muscles attached to the ribs contract due to which our thoracic cavity expands
14.the hard and woody stems of big plants do not have stomata. they have ............for gaseous exchange

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