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31. Give the role of minerals.

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32. In what condition nitrogenases functions?

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33. Write a note on nutrient deficiency symptoms in plants.

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34. Name the mineral constituent of cytochrome.

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35. Write a note on hydroponics.

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36. Which element is a major component of vitamins and certain enzymes and present in amino acid cysteine and methionine.

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37. Mention the significance and disdvantages of hydroponics.

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38. Comment upon active absorption of minerals.

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39. What is necrosis.

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40. Explain mottled leaf.

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