Multiple choice

The term 'trace elements' refers to

  1. toxic substances

  2. small mineral requirements

  3. nitrogen, phosphorus and sulphur

  4. vitamins

  5. the elements CHONPS

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Small mineral requirements include iron, copper, molybdenum and zinc which are required in very less amounts by microbes and hence, are defined as trace elements.