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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.
When does an atoll start to form? This starts to form when tiny marine animals - coral polyps - attach themselves to rocks on the seabed.
Nature of scientific knowledge: Science, as we have seen, is inseparable from the rest of human endeavour. In the past few thousand years of human history, an immense fund of
Explain Haemophilia Haemophilia is a disease characterized by excessive bleeding due to deficiency of clotting factor VIII. The patient need repeated blood transfusion or may
What is happening to the length of a day on the Earth, as a result of the gravitational pull of the Moon?
Define Specific Defence Mechanism In the section on white blood cells, we learnt that whenever a germ or infection enters our body, the WBCs snap to attention and destroy the c
what is soil erosion?
How different pressures of air force water from a container Fit a test tube with a two-hole stopper. By one hole place a length of glass tube which extends into the test tube a
what does homogenious mean?
Let us recall briefly what all we have learnt about fire hazards in this unit. Fire accident can happen due .to a number of reasons, like, flammable liquids, faulty electrical and
What are covalent bonds? Covalent bonds are those in which electrons are shared by the atoms, and this sharing results in an attraction between the atoms to form a molecule. A
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