1. What is the name given to the respiratory holes on the surface of a leaf?   Pits   Stomata   Chlorophyll   Tendrils   Hint Half-n-half Clue   2. Fish breathe through   Nose   Lungs   Skin   Gills   Half-n-half Clue   3. The atmosphere exerts pressure on the surface of the earth.   True   False   4. Which of the following is NOT a noble gas?   Hydrogen   Krypton   Helium   Argon   Half-n-half Clue   5. Air is a   Solid   Gas   Plasma   Liquid   Half-n-half Clue   6. Which gas in the atmosphere saves us from the UV rays of the sun?   Oxygen   Ozone   Nitrogen   Carbon Monoxide   Half-n-half Clue   7. Which of the following is necessary for a substance to burn?   Hydrogen   Gasoline   Light   Oxygen   Half-n-half Clue