What Is Happening In The Nitrogen Cycle?

Plants and animals require nitrogen for the synthesis of essential molecules such as amino acids, proteins, and DNA. Nitrogen is a crucial component of these biomolecules, and without it, the growth, development, and functioning of living organisms would be severely impaired. Therefore, the statement that all plants and animals need nitrogen to make amino acids, proteins, and DNA is true.

Nitrogen is an essential element for living organisms as it is a key component of proteins, nucleic acids, and other important biomolecules. Additionally, nitrogen gas makes up approximately 80% of the Earth's atmosphere. Therefore, the statement is true.

The statement is false because not all bacteria in soil and algae in water can fix nitrogen. Only certain types of bacteria, known as nitrogen-fixing bacteria, have the ability to convert atmospheric nitrogen into a usable form for plants. Algae, on the other hand, do not have the ability to fix nitrogen. Therefore, the statement is incorrect.

Plants and animals cannot directly use the nitrogen in the atmosphere to meet their survival needs. While atmospheric nitrogen is abundant, it is in a form that is not readily usable by most organisms. Instead, plants and animals rely on nitrogen compounds that are present in the soil or water, which they obtain through processes like nitrogen fixation or consuming other organisms. Thus, the statement that plants and animals can use atmospheric nitrogen for their survival is false.