Are plants and animals PH sensitive ?
Our body works with in the PH range of 7.0 to 7.8 living organisms can survive only in a narrow range of PH change.when PH of rain water is less than 5.6 ,it is called acid rain.when acid rain flows into the rivers, it lowers than the PH of the river water.the survival of aquatic life in such rivers becomes difficult.
what is the PH of the soil in your backyard ?
plants require a specific PH range for their healthy growth.to find out the PH required for the healthy growth of a plant,you can collect the soil from various places and check the PH in the manner described below in activity .also you can can note down which plants are growing in the region from which you have collect the soil.
Activity
- put about 2 g soil in a test tube and add 5 mL water to it.
- shake the content of test tube.
- filter the contents and collect the filtrate with the help of universal indiactor paper.
- what can you conclude about the idea soil PH for the growth of plants in your region ?
it is very intresting to note that our stomach produces hydrochloric acid.it helps in the digestion of food without harming the stomach.during indigestion the stomachproduces too much acid and this causes pain irritation. To get rid of this pain, people use bases called antacids.one such remedy must have been suggested b y you at the beginning of the chapter.these antacids neutralise the excess acid.
Magnesium hydroxide(Milk of magnesia), a mild base, is often used for the purpose.
PH change as the causes of tooth decay
Tooth decay starts when the PH of the mouth is lower than 5.5.Tooth enamel,made up of calcium hydroxyapatite(a crystalline form of calcuim phosphate) is the hardest substance in the body .i does not dissolve in water ,but is corroded when the PH in mouth is below 5.5 . Bacteria present in the mouth produce acids by degradation of sugar and food particles remaining in the mouth after eating .the best way to prevent this to clean the mouth after eating food.Using toothpastes,which are generally basic,for cleaning the teeth can neutrsalise the excess acid and p-revent tooth decay.
Self defence by animals and plants through chemical warefare
Have you ever been stung by a honey-bee ? Bee-setting leaves an acid which causes pain and irritation.use of amild base baking soda on the stung area gives relief. stinging hair of nettle leaves inject methaanoic acid causing burning pain.
Self defence by animals and plants through chemical warefare
Have you ever been stung by a honey-bee ? Bee-setting leaves an acid which causes pain and irritation.use of amild base baking soda on the stung area gives relief. stinging hair of nettle leaves inject methaanoic acid causing burning pain.
