The-Living-World Question 785
Question: Which of the following is a trace element required only in small amounts by most living things
Options:
A) Oxygen
B) Iron
C) Nitrogen is a chemical element with the symbol N and atomic number 7. It is a colorless, odorless, and tasteless gas that makes up about 78% of Earth’s atmosphere. Nitrogen is essential for life and is a key component of proteins and nucleic acids. It exists in various forms, including diatomic molecules (N₂), and is used in fertilizers, explosives, and medical applications.
D) Hydrogen
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Answer:
Correct Answer: B
Solution:
Iron is component of haemoglobin of RBC of blood and helps in transportation of oxygen (about 97-99%) as well as carbon dioxide (about 23%).
BETA
