1. What is the name given to the respiratory holes on the surface of a leaf?   Tendrils   Pits   Stomata   Chlorophyll   Hint Half-n-half Clue   2. Which of the following is not a constituent of the atmosphere?   Carbon Dioxide   Oxygen   Nitrogen   Aluminum   Half-n-half Clue   3. The lower, dense region of the atmosphere is known as   Hydrosphere   Stratosphere   Ionosphere   Troposphere   Half-n-half Clue   4. A space that contains no air or any gas is known as   Vacuum   Hollow   Bubble   Pressurized Cabin   Half-n-half Clue   5. The atmosphere exerts pressure on the surface of the earth.   True   False   6. A barometer is used for measuring   Annual Rainfall   Temperature   Atmospheric Pressure   Humidity   Half-n-half Clue   7. A hygroscopic substance is one which   Releases water   Absorbs air   Releases air   Absorbs water   Half-n-half Clue