The atmosphere, Carbon and decay

How much of the atmosphere do nitrogen, CO2 and oxygen make?

Nitrogen 78%, CO2 0.04%, oxygen 21%.

How does CO2 help the Earth?

Helps to insulate the Earth so it has a temperature at which life can exist.

Why is carbon important?

It makes up other things such as living organisms, fats, proteins and carbs.

Give examples of decomposers.

Microorganisms such as bacteria and fungi.

What are detritivores?

Larger organisms than microorganisms such as worms and maggots.

What is decay?

The breaking down of dead matter by living organisms.

How do microorganisms cause materials to decompose?

1) Fungus (hyphae) releases enzymes to work on the dead thing. 2) This means the dead matter becomes soluble. 3) The dead organism absorbs into the fungus.

What are 3 factors that affect the rate of decay?

1) Temperature: works best at optimum temp, as if too hot the enzyme can become denatured but too cold means not enough ke. 2) Humidity: water is needed for metabolic reactions. 3) Access to oxygen: needed for enzymes to work.