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Photosynthesis is a process that helps green plants synthesize their food. A cascade of events and chemical reactions take place in a specified sequential order. Choose an event that does not take place in photosynthesis:

A.  Absorption of light energy by chlorophyll B. Reduction of carbon dioxide to carbohydrate C. Oxidation of carbon to carbon dioxide D. Splitting of water  Solution: C The process by which plants convert carbon dioxide, water, and sunlight into oxygen and energy in the form of sugar is known as photosynthesis. Here are the different steps that make up the process of photosynthesis: Sunlight energy is absorbed by the chlorophyll found in leaves. Conversion of light energy to chemical energy. The water molecule splits into its corresponding components, hydrogen, and oxygen, during this process. Light energy reduces carbon dioxide into carbohydrates like glucose by using the hydrogen and oxygen produced in the above step. Hence, (c) is the correct answer.

Which of the following mineral acids is found in human stomach?

A. Hydrochloric acid B. Lactic acid C. Uric acid D. Methanoic acid Solution: A Hydrochloric acid is found in the human stomach. Its chemical formula is HCl, and it helps in digestion by decomposing complex, large food molecules into simpler ones. The acid activates the pepsinogen enzyme, which is necessary for protein digestion. It also kills dangerous germs in the stomach. Hence, (a) is the correct answer. Know more about Vitamins and Minerals and their deficiency diseases .

What is the chemical formula of Silica?

  A. NaAlO 2 B. H 2 O C. Al 2 O 3 D. SiO 2      Solution: D The Chemical formula for Silica is SiO2. Silica is the common name for Silicon Dioxide. It is commonly found in quartz. SiO2 forms 3-dimensional network solids in which each silicon atom is covalently bonded in a tetrahedral manner to 4 oxygen atoms.  Hence, option (D) is correct. Read more about Chemical Compounds and their formulae .