4.2 bio

Question 1

Nitrogen fixation

Answer 1

n this process, the N2 from air is reduced to NH3 (or NH4+), which can be further converted to nitrogen-containing organic compounds, such as proteins and nucleic acids. Generally, N2 fixation proceeds via natural processes by bacteria.

Question 2

Nitrification

Answer 2

the process of combining, mixing, or filling with nitrogen or one of its compounds.

Question 3

Denitrification

Answer 3

the loss or removal of nitrogen or nitrogen compounds.

Question 4

How does BTB work

Answer 4

when CO2 dissolves in water, it forms a weak acid which makes the pit of pure water as 5.5

Question 5

Predict how BTB (a pH indicator) will change color in a test tube depending upon:
The contents (plant, animal, both) and
The condition (light or dark)

Answer 5

The acidy or alkalinity of the solution it is in
Blue- natural water
Green- slightly acidic water
yellow- more acidic

Question 6

Humans vs cycles

Answer 6

Carbon- burns wood, fossil fuels (oil, coal, gasses) other forms of carbon
Nitrogen- making fertilizers, burning fossil fuels.

Question 7

Energy and carbon through cycles

Answer 7

Energu enters from sun and leaves as heat
Carbon is recycles within the ecosystem, transforming from organic to organic forma and back again

Question 8

Photosynthesis

Answer 8

Sunlight+ C02+ h20 to 02+ glucose

Plants
algae

Question 9

Cellular respiration

Answer 9

glucose+02 to energy+C02+ H20

plants
animals