Nutrient Cycle

Question 1

Nutrients that circulate between living organisms

Answer 1

Oxygen
Nitrogen
Carbon

Question 2

Oxygen cycle

Answer 2

Through the process of photosynthesis, co2 is used to make carbohydrates and oxygen.
Absorbed oxygen to plants and animals break down carbohydrates into co2 and water through respiration.
Decomposers need oxygen to decompose organic compounds and release co2.
Oxygen is mostly dissolved into waters to be used for respiration, decomposition and release of co2 in the water
Oxygen from the atmosphere results in surface weathering of rocks

Question 3

Nitrogen Cycle

Answer 3

Nitrogen is used to form amino acids which are building blocks of protein.
Nitrogen gas(N2) appears in large amounts in the atmosphere which can’t be used by animals and plant in this form so it’s converted to nitrates (NO3-)

Free nitrogen gas is converted into electrical fixation by lightning and rain and nitrogen fixing bacteria where free living soil bacteria absorbs nitrogen from spaces between soil particles and convert it into nitrates
And mutualistic nodule bacteria on the roots of legumes converted free nitrogen to nitrate for the plant. In exchange the plant provides food and secure habitat for the bacteria.

Question 4

Nitrates in the soil

Answer 4

Are absorbed by plants and the nitrogen in nitrates forms plant protein which animals eat and produces animal protein

Question 5

When plants and animals die,

Answer 5

Protein is broken down into ammonia by decomposition bacteria

Question 6

Excretion of animals contain

Answer 6

The compound urea which is converted to ammonia

Question 7

Ammonia is broken down to nitrates by

Answer 7

Nitrifyinh bacteria byconverting ammonia into nitrates (NO2-)
And nitrates to nitrates (NO3-)

Question 8

Nitrates in the soil is

Answer 8

Absorbed by plants to form protein
Converted by denitrifying bacteria in the soil to free nitrogen in atmosphere which completes the cycle

Question 9

Carbon components

Answer 9

Carbohydrates, proteins lipids, nuclei acids and vitamins

Question 10

Carbon occurs in the form of

Answer 10

Co2 and is dissolved into water and is used for photosynthesis by green plants to produce organic compounds

Question 11

Carbon in plants is transferred to animals when

Answer 11

They eat the plant material

Question 12

Dead plant and animal remains that don’t decompose

Answer 12

Are compressed (fossilized) to form fossil fuels like coal and oil

Question 13

Co2 return into the atmosphere by

Answer 13

Cellular respiration
Decomposition
Combustion

Question 14

Combustion

Answer 14

Combustion is a chemical reaction where a substance (fuel) reacts with oxygen, releasing heat and light, resulting in flames or explosion, and converting the fuel into ash, gas, and energy.

Question 15

What happens if the balance of the nutrient Cycle is shifted

Answer 15

Globals warming increases
Co2 concentration increases by use of fossil files and deforestation

Question 16

Solution to shift in nutrient Cycle

Answer 16

Reduce use of fossil fuels by alternating energy sources to decrease Co2
Controlled gas emissions from industry
Reduce release of greenhouse gases