Question

A molecule of nitrogen which you have just breathed in may have been part of a plant that lived thousands of years ago, a part of a dinosaur that lived millions of years ago. This illustrates the principle that

• A. Dead organisms may be fossilised
• B. Nitrogen does not combine readily with other elements
• C. Decay bacteria cycle elements
• D. Nitrogen forms part of the proteins of plants and animals

Answer 1

The correct option is C Decay bacteria cycle elements

This shows that the same molecules of Nitrogen are getting recycled over and over. Nitrogen cycle goes on and the Nitrogen molecules sometime become a part of the macromolecules in organisms or may sometimes become a gas in the atmosphere.

This is done with the help of bacteria that help in decay and recycling of elements.

So the correct answer is 'Decay bacteria cycle elements'.