Answer:

A plant cannot complete its life-cycle in the absence of the element. The action of the element must be specific, with no other element being able to completely substitute for it. The element must be shown to be directly involved in the nutrition of the plant.

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Answer:

1. What are the essential elements for plants?

• Nitrogen for Green, Leafy Growth. Nitrogen is the growth element that promotes green, leafy growth.
• Phosphorus for Energy Transfer. Phosphorus is essential in energy transformations in the plant.
• Potassium for General Health.
• Calcium.
• Magnesium.
• Sulfur.

2. State criteria for their essentiality

Three Criteria for Essentiality of Nutrients:

• A plant cannot complete its life-cycle in the absence of the element.
• The action of the element must be specific, with no other element being able to completely substitute for it.
• The element must be shown to be directly involved in the nutrition of the plant.

3. Give the classification of minerals basis the amount in which they are required by plants.

<br> The essential elements are further classified into two categories <br> (a) Macroelements These are the elements required by plants in larger quantities. These are C, H, O, N, P, K, Mg, Ca and S. <br> (b) Microelements (Trace elements) These are required by plants in low quantities (often less than 1 ppm).

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