Question
What do you understand by crop rotation?
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What is sclerenchyma? Describe location, structure and economic importance of this tissue.
What is the difference between plasma membrane and cell wall? Give the functions of each one.
What is ozone shield? How is it being corroded?

Write the functions of parenchyma, collenchymas and sclerenchyma.
Mention two differences between blood and lymph?
Write a note on collenchymas.