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71. What are the forces which operate in passive diffusion ?

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72. Why the cotyledons are removed from seedlings for performing cultural experiments ?

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73. Write the deficiency symptoms of following : Nitrogen, Phosphorous, Sulphur, Potassium, Calcium and Magnesium.

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74.

(i) Manganese (ii) Copper (iii) Zinc

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75. Explain with examples :
(1) Macronutrients,
(2) Micronutrients,
(3) Toxic elements ,
(4) Essential elements.

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76. What is Foliar Nutrition ? Describe its advantages.

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77.

Define the followings :
(1) Nutrients (2) Micronutrients

(3) Macronutrients (4) Active absorption

(5) Passive absorption

6) Symplastic pathway

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78.

Write short notes on :

(a) Reductive amination

(b) Transamination.

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79. Make a list of macronutrients and mention one major function of any four of them.

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80. Name the four broad categories of essential elements.

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