Which one of the following is micronutrient?

1. nitrogen
2. phosphorus
3. potassium
4. boron

Correct Answer: (d) boron

Explanation:

 Micronutrients are essential elements required in very less quantity for performing physiological functions. For example in humans and animals micronutrients are required in the form of vitamins and minerals. In plants micronutrients are required in the form of minerals.

Example of few micronutrients are calcium, zinc, magnesium, manganese, cobalt, etc.