Question : Which of the following statements is correct?
Option 1: Living organisms can survive a wide range of pH changes.
Option 2: When the pH of rainwater is less than 8.2, it is called acid rain.
Option 3: Our body works within the pH range of 7.0 to 7.8.
Option 4: Tooth decay starts when the pH of the mouth is lower than 1.5.
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Correct Answer: Our body works within the pH range of 7.0 to 7.8.
Solution : The correct option is Our body works within the pH range of 7.0 to 7.8.
The human body operates best within a pH range of 7.0 to 7.8, which is crucial for enzyme activity, cellular function, blood stability, protein structure, and overall health. The body has buffer systems, and regulatory mechanisms to resist pH changes and maintain physiological balance. Living organisms can only survive within a pH range of 6 to 9. Acid rain occurs when the pH drops below 5.6, and tooth decay starts at a pH below 5.5, leading to enamel erosion.
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Question : Which of the following branches deals with the interactions of same species of the living organisms with their non-living environment.
Option 1: Autecology
Option 2: Synecology
Option 3: Ecology
Option 4: Palaeontology
Question : The acid stored in batteries is:
Option 1: Sulphuric acid
Option 2: Nitric acid
Option 3: Hydrochloric acid
Option 4: Acetic acid
Question : Saprophytes are the organisms which depend for food on:
Option 1: living plants
Option 2: living animals
Option 3: dead and decaying material
Option 4: inorgnic chemical compounds
Question : Hydrochloric acid is also known as
Option 1: Gallic acid
Option 2: Picric acid
Option 3: Muriatic acid
Option 4: Chloric acid
Question : The gas causing acid rain in an industrial area is
Option 1: carbon dioxide
Option 2: carbon monoxide
Option 3: sulphur dioxide
Option 4: methane
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