Q-4 Answer correctly. (9)
(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 ?
Answers
Answer:
1. Vaccines help your immune system fight infections faster and more effectively. When you get a vaccine, it sparks your immune response, helping your body fight off and remember the germ so it can attack it if the germ ever invades again.
2.The most common pattern is that birds migrate to the temperate or arctic Northern Hemisphere to breed in the summer and migrate south to warmer regions for the winter. There are four main flyways, or migration routes, in North America that most birds follow between their summer and winter locations.
3.Drip irrigation
Drip irrigation is the best method of irrigation when there is scarcity of water because in this water is provided directly to the roots drop by drop and thus preventing
water loss.
Explanation:
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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)Drip irrigation is one such technology that has been introduced to reduce water consumption in the agriculture sector, leading to sustainability of this sector. It allows farmers to cultivate crops without moisture stress even under water-scarce conditions, thereby increasing farm productivity.