ppt on life process

2. The processes which are
essential to sustain life are
called life processes.

4. Nutrition is the process of
intake of nutrients for energy
and its utilization by an
organism.

6. The mode of nutrition in which organisms prepare
their own food using simple in organic substance is
called autotrophic nutrition.
Example- All green plants and some forms of bacteria

7. The mode of nutrition in which organism derive their
food from other organisms is called heterotrophic
nutrition.
Example- All animals and non-green plants.

9. The mode of nutrition in which
organisms decompose dead and
decaying organic matter to obtain
nutrients is called Saprophytic
nutrition.
Example-fungi, mushrooms and
bacteria

10. The mode of nutrition in
which organisms live on or
inside other organisms (host)
and obtain food from the body
of the host is called parasitic
nutrition.
Example- Cucuta

11. The mode of nutrition in which
organisms feed on complex
organic substance by ingestion
and digest it with the help of
enzymes is called holozoic
nutrition.
Example- human beings, dog,

13. All green plants are autotrophs.
They synthesise food by the process of photosynthesis.
Photosynthesis is the process by which green plants synthesis
their food from atmospheric carbon dioxide and water using the
energy of light.
6CO2+12H2O C6H12O6+6H2O+6O2
Plants obtain carbon dioxide through tiny pores present on their leaves.
Sunlight
Chlorophyll

14. The following events occur during this process-
Absorption of light energy by chlorophyll.
Conversion of light energy to chemical energy and
splitting of water molecules into hydrogen and
oxygen.
Reduction of carbon dioxide to carbohydretes.

15. Amoebea takes in food using
temperory fingur-like
extensions of the cell surface
called pseudopodia
(falsefeet).
Pseudopodia fuse over the food
particle forming a food-vacuole.
Inside the food –vacuole,
complex substances are broken
into simpler ones which then
diffuse into cytoplasm.
The remaining undigested
material is moved to the surface
of cell and thrown out.

16. Human digestive system
The Human digestive system
comprises of the alimentary
canal and associated digested
glands.
The alimentary canal starts
from mouth and extend upto
anus it is 9 to 10 meters long.

17. Food is taken
in the oral cavity through
mouth .Here salivary glands
secrets saliva which moisten
the food and an enzyme
salivary amylase which
present in saliva digest
starch. Food is also chewed
here by teeth.

18. No digestion take place
in oesophagus.
Rhythmic contraction
and expansion happens
to push the food forward
called peristaltic
movements.

19. Stomach has gastric glands
which secrets gastric juice.
Gastric juice contains pepsin,
hydrochloric acid and mucus
Pepsin digest protein with
the help of hydrochloric acid
Hydrochloric acid kill the
germs of food and provide
acidic medium to pepsin .
Mucus protects the inner
lining of stomach from acid.
Complete digestion does not
take place in stomach.

20. Intestinal glands
present here.
These glands secrets
carbohydrase, Lipase
and protease.
Digested food is
absorbed by blood
here.

21. It reabsorbs water and
minerals.
Rectum is the last part
of large intestine and
stores digestive waste
and finally the waste
expelled out through
anus.

22. It is the largest gland of our
body.
It secrets bile juice which
emulsify fat.
Bile juice make medium
alkaline which helps trypsin
to digest protines

23. It stores
bile juice.

24. Pancreas secretes pancreatic
juice.
 Pancreatic juice contain
Trypsin, pancreatic amylase
and lipase.