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Chemical compounds can be broadly classified into three categories Acids,Bases and Salts. ACIDS The word acid is derived from a Latin word 'acere' or 'acidus' meaning'sour'. All acids have one property in common that is they all are sour in taste. Most people think that acids are fuming corrosive dangerous liquids. However all acids are not like this.e.g.vinegar contains acetic acid and it is used to preserve the food.(pickles). Classification of acids    ORGANIC ACIDS: The acids produced by the plants and animals are known as organic acids. Eg.acetic acid, oxalic acid, tannic acid etc. MINERAL ACIDS: These are prepared in laboratories and are corrosive in nature. Eg. Hydrochloric acid, Sulphuric acid and Nitric acid. PROPERTIES OF ACIDS 1. They have a sour taste. 2. They are corrosive in nature. Most acids especially the strong ones can burn our skin and react with many materials are corrosive liquids and also destroy paper and clothes.

A tissue is formed by a group of cells which are similar in structure and perform similar functions. There are two different types of tissues present in plants ;   the simple tissue and the complex tissues. The meristematic tissue, the ground tissue, the dermal tissue are simple tissues whereas the vascular tissue is a complex tissue . THE TYPES OF SIMPLE TISSUES: I.  MERISTEMATIC TISSUE These are called as the growing tissue in plants. They help in bringing about the  growth in length and diameter in plants. The cells in these tissue are small ,with prominent nucleus and abundant cytoplasm. The cells are continuously dividing ,compactly arranged without any intercellular spaces. Depending upon the regions where these tissues are present, they can be classified as : APICAL MERISTEMATIC TISSUE These are present at the growing regions of shoot tip and root tip. They bring out the growth in length of plants. LATERAL MERISTEMATIC TISSUE These are present at the lateral sides of stem and ro