1. Every living organism has a need of nutrition as
it is through nutrition that one obtains energy.
2. The process of intake and utilisation of nutrients
(i.e. substances that either release energy or
help in the manufacture of biomolecules) is
known as nutrition.
3. Green plants are autotrophs as they synthesise
their own food using sunlight, chlorophyll,
carbon dioxide and water.
13. Breathing is a physical process which involves
inhalation and exhalation.
14. Respiration is a biochemical process which
includes breathing and oxidation of food.
15. Respiration in the presence of oxygen is known
as aerobic respiration.
16. Respiration that occurs in absence of oxygen is
known as anaerobic respiration.
17. During aerobic respiration, food (glucose) is
completely broken down into carbon dioxide
and oxygen and energy is released in the form
4. Photosynthetic equation
6CO2 + 12H2O
6H2O + 6O2
5. Chlorophyll is a light receiver which can trap
solar energy within its molecule.
18. Aerobic respiration occurs in higher organisms
including human being.
19. Anaerobic respiration occurs in certain bacteria,
yeast and also in our muscles.
6. The site of chlorophyll activity is the special
plant cell organelles called chloroplasts.
20. The muscles of vertebrate animals can continue
working for a minute or two without oxygen.
7. In humans the alimentary canal is basically a
long tube extending from the mouth to the anus.
When we eat something we like, our mouth
‘waters’. This watery fluid is called saliva
secreted by the salivary glands.
21. Micro-organisms such as yeast and certain
bacteria obtain their energy by anaerobic
respiration which is termed fermentation.
22. Common type of fermentation is alcoholic
fermentation which is performed by yeast.
8. The gastric glands present in the...