1. Assertion: Cell theory was put forward by Schleiden and Schwann. Reason: It is applicable to all cells including viruses. II. Assertion: Agricultural output increased several times after introduction of DDT. Reason: DDT was the first insecticide used on a wide scale. TH. Assertion: Light is not considered as matter. Reason: Light does not occupy space, has no rnass or volume. IV. Assertion: Burning of coal is a physical change. Reason: When coal is burnt, the chief component, carbon is changed to carbon dioxide. This process cannot be reversed. V. Assertion: If the displacement of body is zero, the distance covered by it may not be zero. Reason: Displacement is a vector quantity and distance are a scalar quantity.
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DDT is toxic to wide range of insect pests while being least toxic to mammals. DDT is persistent and do not break down rapidly in the environment, so it didn’t have to be reapplied often. DDT was effective at killing pests which eventually lead to boost crop yields. Farmers used more and more DDT throughout the 1950s and 1960s to get an increased yield of crop
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