Question:
All the living organisms are basically made up of $\mathrm{C}, \mathrm{N}, \mathrm{S}, \mathrm{P}, \mathrm{H}$ and $\mathrm{O}$. How do they enter the living forms ? Discuss.
Solution:
Most of them first enter plants and become components of organic materials during the process of photosynthesis. They enter plants from air $\left(\mathrm{CO}_{2}\right)$, water and ions (from soil). From plants the chemicals pass on to other organisms.