Page 64 - Science Class 07

respira on are aerobes. Majority of animals called fermenta on. In bread making industry,
have aerobic respira on. yeast is used to make breads and cake. Yeast
release CO during respira on when added to
C H O + 6O ⟶ 6CO + 6H O + Energy 2
6
2
12
2
2
6
moist dough of flour. This CO forms bubble and
All the organisms that obtain energy by aerobic 2
make the bread and cake rise.
respira on cannot live without the oxygen. This
is because if there is no oxygen, they cannot
get energy from the food which they eat.
Aerobic respira on produces more energy 1. What is breathing and how it differs from
because a complete breakdown of glucose respira on?
occurs during respira on by the use of oxygen.
2. Why does our body carry in the process
Anaerobic Respira on of respira on?
Respira on in which oxygen is not u lised by 3. How anaerobic respira on is different

the organisms to release energy from the food from aerobic respira on?
is called anaerobic respira on. Here, anaerobic
4. What is the advantages of anaerobic
respira on means ‘without air’. In this process respira on?
of respira on, very li le amount of energy is
5. What is fermenta on?
released because glucose is not completely
broken down into carbon dioxide and water, it
RESPIRATION IN HUMAN BEINGS
is changed into other chemicals such as
The human respiratory system is made up of
alchohol lac c acid. Micro-organisms like yeast
many organs such as nose, nasal cavity,
and a few bacteria carry out anaerobic
pharynx, larynx, trachea, bronchi and a pair of
respira on.
lungs. But, lungs are the main respiratory

organs where exchange of gases takes place.
Aerobic Respira on Anaerobic Respira on
Following is the detail of human respiratory
Man and most of Yeast and a few system:
the other bacteria

organisms
Nasal Cavity
Glucose Glucose
Nostrils Pharynx
O , CO and water Alcohol and lac c acid
2
2
Epiglo s Larynx
Trachea
FERMENTATION
Bronchi
The process of anaerobic respira on is also Lungs
very useful for a number of industrial
processes, e.g., sugars are broken down by Diaphragm
yeast, through anaerobic respira on, into
alcohol in brewing industries. This process is
Human Respiratory System

64 Science-7