B4

Question 1

How do you calculate the rate of decay?

Answer 1

Rate of decay (g/day)= change in mass➗time (days)

Question 2

How does nitrogen cycle through the abiotic and biotic components of an ecosystem?

Answer 2

Nitrogen is needed by organism to make DNA and compounds, but can only be used in the form of a compound, nitrate.

🔵water in soil has nitrates, taken up by plants
🔵plants eaten by animals
🔵plants and animals die/ excrete faeces and urea), ammonia back in soil

Question 3

How does carbon cycle through the biotic and abiotic components of an ecosystem?

Answer 3

Carbon used in carbohydrates,fats , protein &DNA
🟡carbon dioxide taken in by plants from photosynthesis
🟡eaten by animals & plants
🟡burning fossil fuels puts it back into air. When plants and animals die they turn into fossil fuels
🟡respiration puts it back into air (from plants &animals)

Question 4

What is the role of micro organisms in the cycling of materials in an ecosystem?

Answer 4

🟢Micro organism break down dead organisms.
🟢help return mineral and nutrients to the environment, so the materials can be used by other organisms
🟢🟢🟢

Question 5

What is the role of microorganisms in decomposition

Answer 5

Microorganisms called decomposes , secrete enzymes