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Q-4Answer correctly.(1) How does the vaccine help to prevent disease?(2) Why do birds migrate?(3) Which irrigation system is useful in water scarcity area? Why? |
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Answer» Answer: 1.When the familiar antigens are detected, B-lymphocytes produce antibodies to attack them. Vaccines prevent DISEASES that can be dangerous, or even deadly. Vaccines greatly REDUCE the risk of infection by working with the body's natural defenses to safely develop immunity to disease. 2.Migratory BIRDS fly hundreds and thousands of KILOMETRES to find the best ecological conditions and habitats for feeding, breeding and raising their young. When conditions at breeding sites become unfavourable, it is time to fly to regions where conditions are better. There are many different migration patterns. 3.Therefore agriculture is often criticised as a wasteful water user, especially in water scarce areas. Drip irrigation is widely recognised as the most efficient irrigation technique and often portrayed as the best solution to increase agricultural production WHILST reducing the demand for water. plz follow me |
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