CHAPTER – 6
LIFE PROCESSES
All living things perform certain life processes like growth, excretion, respiration,
circulation etc.
All the processes like respiration, digestion, which together keep the living organisms
alive and perform the job of body maintenance are called life processes.
Examples :
Kinds of nutrition in which in organic Kinds of nutrition in which in organisms do
materials like CO2, water etc are utilized to not possess the ability to synthesize their
prepare organic food by the process of own food. They depend on autotrophs for
photosyntheses their food supply directly or indirectly.
Eg. Green Plants eg. Animals, Fungi
50 X – Science
AK
, Autotrophic Nutrition :
The organisms which carry out autotrophic nutrition are called autotrophs (green
plants)
Autotrophic nutrition is fulfilled by the process by which autotrophs take in CO2 and
H2O and convert these into carlohydrates in the presence of chlorophyll, sunlight is
called PHOTOSYNTHESIS
Equation :
Raw Materials for Photosynthesis :
q Sunlight
q Chlorophyl Sunlight absorbed by chlorophyll
q CO2 enters through Stomata, and Oxygen (O2) is released as by product
through stomata on leaf.
q Water water + dissolved minerals like Nitrogen phosphorous etc are taken
up by the roots from the soil.
Site of Photosynthesis :
Chloroplast in the leaf. Chloroplast contain chlorophyll. (green pigment)
Main Events of Photosynthesis :
q Absorption of light energy by chlorophyll
q Conversion of light energy into chemical energy + splitting (breaking) of water
into hydrogen and oxygen.
q Reduction of CO2 to carbohydrates.
STOMATA : Tiny pores present on the surface of the leaves
FUNCTIONS :
(i) Exchange of gases O2/CO2
(ii) Loses large amount of water [water vapour] during transpiration.
51 X – Science
AK
LIFE PROCESSES
All living things perform certain life processes like growth, excretion, respiration,
circulation etc.
All the processes like respiration, digestion, which together keep the living organisms
alive and perform the job of body maintenance are called life processes.
Examples :
Kinds of nutrition in which in organic Kinds of nutrition in which in organisms do
materials like CO2, water etc are utilized to not possess the ability to synthesize their
prepare organic food by the process of own food. They depend on autotrophs for
photosyntheses their food supply directly or indirectly.
Eg. Green Plants eg. Animals, Fungi
50 X – Science
AK
, Autotrophic Nutrition :
The organisms which carry out autotrophic nutrition are called autotrophs (green
plants)
Autotrophic nutrition is fulfilled by the process by which autotrophs take in CO2 and
H2O and convert these into carlohydrates in the presence of chlorophyll, sunlight is
called PHOTOSYNTHESIS
Equation :
Raw Materials for Photosynthesis :
q Sunlight
q Chlorophyl Sunlight absorbed by chlorophyll
q CO2 enters through Stomata, and Oxygen (O2) is released as by product
through stomata on leaf.
q Water water + dissolved minerals like Nitrogen phosphorous etc are taken
up by the roots from the soil.
Site of Photosynthesis :
Chloroplast in the leaf. Chloroplast contain chlorophyll. (green pigment)
Main Events of Photosynthesis :
q Absorption of light energy by chlorophyll
q Conversion of light energy into chemical energy + splitting (breaking) of water
into hydrogen and oxygen.
q Reduction of CO2 to carbohydrates.
STOMATA : Tiny pores present on the surface of the leaves
FUNCTIONS :
(i) Exchange of gases O2/CO2
(ii) Loses large amount of water [water vapour] during transpiration.
51 X – Science
AK
