Hey tenthies. We are sharing with you all the best notes for the chapter LIFE PROCESSES of Class 10 Biology CBSE which will not only help you ace your board exams but also enrich your knowledge. These are in the simplest language that you can get online and the most AFFORDABLE. Made with hardwork ...
LIFE PROCESSES
MOLECULAR MOVEMENT(Sign of LIVING) -No mov. In viruses-Considered dead
Living beings-well organised structures – These structures likely to break –Organism dead.So its imp-
Living beings must keep repairing,maintaining these structures
Since these structures – made of molecules-must be moving all the time
For a living being it is necessary to perform basic functions for proper body functioning. These
basic functions performed by organisms to maintain life are known as life processes.
Processes essential for maintaining life
1)NUTRITION –Energy needed for maintenance processes .This energy comes from outside of the
body of living organism .So the process to transfer the energy(food) from outside-inside the body is
called NUTRITION. CARBON-BASED MOLECULES
Food includes carbohydrates ,fats ,vitamins ,proteins.
CELLULOSE STARCH SUGAR
(CAN’T BE DIGESTED (DIGESTABLE)
BY HUMANS)
OUTSIDE RAW MATERIALS USED BY AN ORGANISM—food,water,sunlight,Oxygen( oxidise
food and release energy)
2)RESPIRATION-Energy must be broken down for use in the body.Oxidising-reducing reactions-
common chemical means to break down molecules..The process of acquiring oxygen from outside
the body and using it to breaking the food sources for cellular needs-RESPIRATION.
SINGLE-CELLED ORGANISM-No specific organs MULTI-CELLED ORGANISM-All cells may not be
Entire surface of organism is in Taking in food direct contact with the environmentSimple
contact with environment Exchanges of gases diffusion(gaeous movement from high to low
Removal of wastes concentration)will not meet requirements of all
Cells
3)TRANSPORTATION-Food and oxygen are taken up at only one place and all the body parts need
the foodProcess of carrying food and oxygen from one place in the body to another
TRANSPORATION(TRANSPORTS WASTE AWAYS FROM CELL TO EXCRETORY TISSUE)
4)EXCRETION- When chemical reactions uses food and O2 to generate energy, many by products are
created in the body that are not only useless but also harmful for the bodyNeeded to be removed
and discarded out from the body EXCRETION(TRANSPORTS OUT FROM THE BODY)
NUTRITION
AUTOTROPHIC HETEROTROPHIC
HIC
Organisms that prepare their Organisms that cannot prepare their own
own food through the process of food and depend upon autotrophs for
photosynthesis .Ex-Green plants nutrition
SYMBIOTIC PARASITIC SAPROTROPHIC HOLOZOIC
Two organisms live in Organism lives inside organisms feed Organism takes
close association to the host organism for on dead and food into the body
benefit each other nutrition decaying matter through mouth
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