Question

An essential element is

• A. Improve plant growth
• B. Present in plant ash
• C. Is indispensable for growth and is irreplaceable
• D. Available in soil

Answer 1

Answer: (C)

Is indispensable for growth and is irreplaceable

Plants absorb a number of mineral elements. All of which may not be essential for growth of plants. Hence, criteria of essentiality should be established. One of the criteria of essentiality is that the mineral element is indispensable and irreplaceable by another element for growth of plant.

Example, C, H, N, P etc a total of 17 elements.

So, the correct answer is 'Is indispensable for growth and is irreplaceable'