answr
Login
Join Now

Biogeochemical Cycle - Oxygen Cycle

Oxygen CycleGaseous Cycles

Transcript

  • 0:3Oxygen is an important component of all
  • 0:7
  • 0:7biomolecules. We cannot even imagine our
  • 0:11
  • 0:11life without oxygen, as it is essentially
  • 0:15
  • 0:15required by all the organisms which
  • 0:18
  • 0:18respire aerobically. Oxygen is found in
  • 0:23
  • 0:23the elemental state in the atmosphere in
  • 0:26
  • 0:26the 21 percent. It is also found in the
  • 0:31
  • 0:31combined state as carbon dioxide, water
  • 0:35
  • 0:35and also in the Earth's crust in the
  • 0:39
  • 0:39form of oxides of metals, sulfates,
  • 0:43
  • 0:43carbonates etc. But how we all get this
  • 0:48
  • 0:48oxygen?
  • 0:49
  • 0:49Let's talk about the oxygen cycle in
  • 0:52
  • 0:52this lesson. Oxygen from the atmosphere
  • 0:55
  • 0:55is used up in three major ways- by
  • 1:0
  • 1:0respiration, combustion and also in the
  • 1:4
  • 1:4formation of oxides of nitrogen. So as a
  • 1:8
  • 1:8product of respiration, the carbon
  • 1:11
  • 1:11dioxide and water are released and now,
  • 1:14
  • 1:14they are used up in the process of
  • 1:16
  • 1:16photosynthesis by plants. Oxygen, it is
  • 1:21
  • 1:21given out in the atmosphere by only one
  • 1:24
  • 1:24major process, which is photosynthesis.
  • 1:27
  • 1:27Now, though we think that oxygen is necessary
  • 1:32
  • 1:32for all the life forms to survive, it
  • 1:35
  • 1:35might be of your interest that not all
  • 1:38
  • 1:38the organisms need oxygen to live.
  • 1:42
  • 1:42In fact, for some organisms like bacteria
  • 1:45
  • 1:45oxygen is a poisonous element. So, for
  • 1:50
  • 1:50example, if you see a nitrogen fixing
  • 1:52
  • 1:52bacteria, this bacteria it does not
  • 1:55
  • 1:55require oxygen for respiration.
  • 1:59
  • 1:59It performs respiration without oxygen only.
  • 2:3
  • 2:3So student in this lesson you have learned
  • 2:6
  • 2:6about the oxygen cycle.

Learn with Videos

Biogeochemical Cycle - Carbon Cycle
5 min
Biogeochemical Cycle - Nitrogen Cycle
7 min