Question : The presence of oxygen in the atmosphere is due to:
Option 1: Photosynthesis
Option 2: Excretion
Option 3: Nitrogen fixation
Option 4: Respiration
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Correct Answer: Photosynthesis
Solution : The correct option is Photosynthesis.
Photosynthesis is a mechanism that plants and certain bacteria use to convert carbon dioxide and water into glucose (sugar) and oxygen. This process emits oxygen into the atmosphere and is required for the oxygen-carbon dioxide balance to be maintained.
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Question : The highest volume of gases in the lower atmosphere is comprised of
Option 1: Hydrogen
Option 2: Carbon dioxide
Option 3: Oxygen
Option 4: Nitrogen
Question : Which one out of the following helps in burning?
Option 1: Oxygen
Option 2: Carbon monoxide
Option 3: Nitrogen
Option 4: Carbon dioxide
Question : Vegetables and fruits should be a part of our diet because they stimulate:
Option 1: peristalsis
Option 2: salivation
Option 3: excretion
Option 4: respiration
Question : When the bread rises and bakes, __________creates thousands of bubbles in the dough.
Option 1: phosphorus
Option 2: nitrogen
Option 3: oxygen
Option 4: carbon dioxide
Question : Directions: Arrange the following words as per order in the dictionary. 1. Billian 2. Bifurcate 3. Bilateral 4. Bilirubin
Option 1: 2, 1, 3, 4
Option 2: 4, 3, 2, 1
Option 3: 2, 3, 4, 1
Option 4: 2, 3, 1, 4
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