how ph of saliva affect tooth decay,effect of PH on growth of plants and effect of PH on aquatic animals .Answer step wise.
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Answer:
PH IN DIGESTIVE SYSTEM - DEFINITION
The pH in the human digestive tract varies greatly. The pH of saliva is usually between 6.5 - 7.5. The fundic or upper portion of the stomach has a pH between 4.0 - 6.5, lower portion of the stomach secrete hydrochloric acid (HCI) and pepsin until it reaches a pH between 1.5 - 4.0.
PH IN GROWING CROPS - DEFINITION
pH is a scale that chemists use to measure acidity. Values below 7 are considered acidic, values above 7 are alkaline ( the opposite of acidic) and 7 is neutral. Most plants can tolerate a wide pH range in solution culture, but they cannot tolerate a wide range of acidity in the soil.
EFFECT OF PH ON TOOTH DECAY - DEFINITION
The saliva in a healthy mouth has a pH of 7.1. Certain foods increase the acidity of the mouth and reduce the pH level. Saliva helps neutralize the acid, but the pH of saliva can become more acidic after eating acidic foods. It can take between a few minutes to a few hours for the pH of the mouth to neutralize. In that time, the lower pH of the mouth creates an optimal environment for bad bacteria, which eventually causes tooth decay.
EFFECT OF PH ON PLANTS AND ANIMALS - DEFINITION
High levels of either acidity or alkalinity can be harmful to plants and animals.
Effect on Plants:
Most of the plants do best when soil'd pH is in the neutral range i.e. 6 to 7.
Acidic soil can prevent certain nutrients from being absorbed by plants that are best absorbed in alkaline soil. In very alkaline soil, certain important micro-nutrients such as zinc and copper become chemically unavailable to plants.
Effect on Animals:
Effect of pH is most observed for the animals that stay in water. Acidic water robs fish and other aquatic species of sodium in the blood and oxygen in the tissues. Additionally, it affects the functioning of fish gills. Acidic water also poisons fish eggs, as they will not hatch if water pH is too low.
In addition to the direct effects on fish, acid water also destroys ecosystems by killing organisms lower on the food chain.
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