Reading Comprehension - 2

It has long been known that when exposed to light under suitable conditions of temperature and moisture, the green parts of plants use carbon dioxide from the atmosphere and release oxygen to it. These exchanges are the opposite of those which occur in respiration. The process is called photosynthesis. In photosynthesis, carbohydrates are synthesized from carbon dioxide and water by the chloroplasts of plant cells in the presence of light. Oxygen is the product of the reaction. For each molecule of carbon dioxide used, one molecule of oxygen is released. A summary chemical equation for photosynthesis is: 6CO2 + 6H2O C6H12O4 + 6O2

1) The combination of carbon dioxide and water to form sugar results in an excess of
(A) Water
(B) Oxygen
(C) Carbon
(D) Chlorophyll

2) A process that is the opposite of photosynthesis is
(A) Decomposition
(B) Synthesization
(C) Diffusion
(D) Respiration

3) In photosynthesis, water
(A) must be present
(B) is produced in carbohydrates
(C) is stored as chemical energy
(D) interrupts the chemical reaction

4) The title below that best expresses the ideas in this passage is
(A) a chemical equation
(B) the process of photosynthesis
(C) the parts of vascular plants
(D) the production of sugar



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