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Life Process Extra Notes

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Life Process Extra Notes

  • Course: Bio 101
  • Professor: Elizebth
  • School: DPS Sharjah
Page 1 of 15
Assignments in Science Class X (Term I)

6

Life Processes
IMPORTANT NOTES

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
of ATP.

4. Photosynthetic equation
6CO2 + 12H2O

sunlight
chlorophyll

C6H12O6 +

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...
1
G
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.
4. Photosynthetic equation
6CO
2
+ 12H
2
O
sunlight
chlorophyll
C
6
H
12
O
6
+
6H
2
O + 6O
2
5. Chlorophyll is a light receiver which can trap
solar energy within its molecule.
6. The site of chlorophyll activity is the special
plant cell organelles called chloroplasts.
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.
8. The gastric glands present in the stomach wall
of human, release hydrochloric acid, pepsin and
mucus.
9. Tooth decay or dental carries causes gradual
softening of enamel and dentine. Brushing the
teeth after eating removes the dental plaque.
10. Factors that affect photosynthesis are (i) Light,
(ii) Temperature, (iii) Water, and (iv) Carbon
dioxide.
11. Animal nutrition shows a very wide range.
Unicellular organisms like Amoeba obtain food
by the process of phagocytosis. The human
digestive system climaxes the evolutionary
development of the digestive system with
numerous glands, digestive juices and organs
working together. The various steps of nutrition
are ingestion, digestion, absorption and
assimilation.
12. The energy-rich molecule in which energy is
first captured is adenosine triphosphate or ATP.
IMPORTANT NOTES
6Life Processes
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
of ATP.
18. Aerobic respiration occurs in higher organisms
including human being.
19. Anaerobic respiration occurs in certain bacteria,
yeast and also in our muscles.
20. The muscles of vertebrate animals can continue
working for a minute or two without oxygen.
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.
23. Direct respiration is seen in unicellular organisms
like Amoeba, Paramecium, bacteria and
Chlamydomonas.
24. Diffusion is defined as the movement of a
substance from a region of higher concentration
to a region of lower concentration.
25. Rate of respiration in plants is much slower than
in animals.
26. In higher plants, the exchange of gases occurs
through stomata and lenticels.
27. Organs of respiration in animals are skin,
trachea, gills, lungs, etc.
28. Thin-walled air sacs called alveoli are present
in lungs.
29. The blood contains a pigment, haemoglobin,
which helps in the transport of carbon dioxide
and oxygen.
Assignments in Science Class X (Term I)