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Define White Blood cells (WBCs)
WBCs are also called leukocytes, as they are colourless. They are the army of the human body. Whenever a germ or infection enters our body, the WBCs snap to attention and destroy the culprit. Their primary function is to produce antibodies (humoral immunity) or kill the invading bacteria directly (cytotoxic immunity). We will learn more about this later in the next unit on the Immune System.
The important physico-chemical properties of thiamin are as follows: a) Thiamin hydrochloride is a white, needle-shaped crystalline substance. b) It has a characteristic sm
An experiment with a floating candle Put a nail in the lower end of a candle. The nail should be just the right weight to make the candle float with its top a little above the
Differentiate between soil water content and plant available soil moisture. The mass of water lost relative to mass of dry soil is called soil water content whereas plant avai
Reactions of Carboxylic Group Salt formation: In alkaline medium, XOOH group reacts with metal hydroxide to form amino acid salts.
Lab coats : The lab coat should fit well and should be buttoned up correctly at all times. Cotton lab coats are more suitable than those made from nylon as the former could absorb
Lifting water with air pressure Fit a test tube with a single-hole cork and glass tube. Drive out the air by boiling a little water in it. Invert it with the open end under the
Define the olfactory area of the Cerebrum The olfactory area lies deep within the temporal lobe. Look at Figurefor its position. Cells receive and interpret impulses from nose
To show that expired air contains carbon dioxide The two flasks are linked so that when you breathe by the T piece, all the air bubbles by the lime water in the flasks. One tub
Explain Control of Our Heart through Nerves When we exercise in the mornings, the heart beats faster and when we sleep at night, it slows down. Have you ever wondered how does
how to show air contains carbon dioxide
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