Chemistry

Which is the most abundant element in the human body?

• Carbon

• Oxygen

• Hydrogen

• Nitrogen

Which is the second most abundant element in the Earth's crust?

• Oxygen

• Silicon

• Aluminum

• Iron

How are called the elements that are essential and are part of living beings?

• Biogenic elements

• Great elements

• Living elements

• Super elements

Their principal elements are C, H, N, O, P and S, and make up almost 99% of living matter; they are the main part of biomolecules.

• Primary bio elements

• Trace bio elements

• Secondary bio elements

• Metals

They exist within all living organisms, but in less amounts. Calcium (Ca) is the most abundant of them. These are essential for the correct function of organisms.

• Secondary bio elements

• Primary bio elements

• Trace bio elements

They are found in minimum quantities in human beings, in proportions equal or less than the 0.1%. They are mostly made up of transition metals. It also includes nonmetals. Even though these elements are found in minimum quantitities in organisms, they are essential bio elements, because they are part of vital processes. If one of them is missing, a serious unbalance in the organism can lead to death.

• Trace bio elements

• Secondary bio elements

• Primary bio elements

• Minimum elements

How does our body get bio elements?

• When we eat food

• From the air

• Through photosyntesis

• From the water

Select the correct option(s)

What are biomolecules?

• Molecules that are essential for life

• Carbohydrates, lipids and proteins.

• C, H, O, N.

• Calcium, Iron, Vanadium

What is biomass?

• Total amount of mass that belong to living beings in an ecosystem.

• The weight of bio molecules

• The mass of bio elements

• The study of living mass

What are autotrophs?