Page 2 - Lesson notes- Living world

-Characteristics of living beings to produce progenies possessing features of
their own type.
-Reproduction is of sexual& asexual type.
-Fungi produce spores for asexual reproduction.
-Organism viz. Planaria reproduce by regeneration in which a fragment of body
forms whole organism.
-Fungi,filamentousalgae,protonema of moss reproduce by fragmentation also.
-In unicellular organisms growth & reproduction are synonymous.
1. Certain organisms do not reproduce viz. mule ,worker bees, infertile human
couple.
-Hence reproduction cannot be considered as defining property of living
beings.

Metabolism:

-Several chemical reactions occur in living organisms.-Some of these reactions
are anabolic others are catabolic.
-All the reactions together are called metabolic reactions & process is called
metabolism.
-It has no exception.

-It is defining property of living beings.

Cellular organisation:

-living organisms consist of cells & their products.

-It is defining property of living beings.

Consciousness: Ability to sense environment & respond to environmental
factors
-
Living beings sense& respond to environmental factors viz. Light,water,te
mperature,other organisms, pollutants etc.

-It is defining property of organisms.

Living organisms can be considered as self replicating, evolving & sel
f-regulating interactive systems capable of responding to external stimuli.
Diversity in the living world:
-Described number of species range 1.7-1.8 million.
-Local names of organisms may not be applied at global level.
-Scientific names are given to organisms after identification, acceptable at
global level.