To calculate the current 
value for human population we need to know about
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For calculating the current 
value, we need to know the birth rates and death rates. In 1981, the r value for human population in India was 0.0205 . 135. Phloem parenchyma is made up of elongated, tapering cylindrical cells which have dense cytoplasm and nucleus. The cell wall is composed of cellulose and has pits through which plasmodesmatal connections exist between the cells. The phloem parenchyma stores food material and other substances like resins, latex and mucilage.
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