This pdf covers each and every aspect of class 10 NCERT chapter of science textbook called LIFE PROCESSES. It covers all the topics and details in crisp and to-the-point manner and also have practice questions in between. One can easily go through this PDF and understand each and every topic and re...
,1) Criteria to decide whether something is alive :-
● The most important criteria to decide whether something is alive is
movement. All living things move without the help of any external help.
Some movements are easily visible like the movements of body parts.
Some movements are not easily visible like molecular movements. The
molecular movements in cells and tissues is necessary for all life
processes.
,2) Life processes :-
● Life processes are the basic processes in living organisms which
are necessary for maintaining their life. The basic life processes are –
nutrition, respiration, transportation, and excretion.
● i) Nutrition :– is the process of taking food by an organism and its
utilization by the body for life processes.
● ii) Respiration :– is the process by which food is burnt in the cells of
the body with the help of oxygen to release energy.
●iii) Transportation :– is the process by which food, oxygen, water,
waste products are carried from one part of the body to the other,
●iv) Excretion :- is the process by which waste products are removed
from the body.
, 3) Nutrition :-
● Nutrition is the process of taking food by an organism and its
utilisation by the body to build the body, for growth, to repair the
damaged parts of the body and for energy.
● Life on earth depends on carbon based molecules and most of the
food are also carbon based molecules. The outside raw materials
used by living organisms are food, water and air.
●a) Modes of nutrition :- There are two main modes of nutrition. They
are autotrophic nutrition and heterotrophic nutrition.
●i) Autotrophic nutrition :- is nutrition in which organisms prepare
their own food from simple inorganic substances like carbon dioxide
and water in the presence of sunlight and chlorophyll.
● Eg :- all green plants and some bacteria.
●ii) Heterotrophic nutrition :- is nutrition in which organisms get their
food directly or indirectly from plants.
● Eg :- all animals fungi and some bacteria.
●b) Types of heterotrophic nutrition :- There are three main types of
heterotrophic nutrition. They are saprophytic, parasitic and holozoic
nutritions.
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