Question

Name two elements, compounds and mixtures that are essential for living organisms. Also write why are they essential?​

Answer 1

elements:

calcium : for strong bones

Iron : maintaining haemoglobin for metabolism

compunds

sodium chloride : to maintain blood pressure and other life processes

Adenosine Triphosphate: for metabolism, to maintain rate of inhalation and exhalation of oxygen and to supply energy

Mixture:

I) gasoline : used as fuel

ii) cement : used in construction

Answer 2

Elements-

1. Oxygen is essential for living organisms to survive.
2. Carbon dioxide is essential for the survival, growth and reproduction of living things. Plants obtain carbon from the atmosphere in the form of carbon dioxide, which they need for photosynthesis. They convert inorganic carbon into organic carbon in the form of sugar and starch, which they add to their tissues.

Compounds-

1. Water is essential for living organisms to stay hydrated.
2. Carbohydrate and protein- These compound are used to form new cells and tissues and to repair.

Mixtures-

1. Blood is very much important for the transportation of oxygen in living organisms.
2. Blood plasma is an example of a homogeneous mixture. This is a colourless fluid that holds the blood cells in suspension. It makes up a little more than half of the volume of human blood.