This document discusses the environment and what constitutes life from a biological perspective. It explores the hierarchy of organization in nature from subatomic particles to the universe. Living things are defined by their complex organization, ability to maintain homeostasis, self-perpetuation, growth and development, interactions with their environment to obtain energy and matter, adaptation, and response. Humans are part of this biological hierarchy but are unique in that they can modify their environment to suit themselves, whereas other organisms adapt to the environment. The human environment consists of both natural spheres like the biosphere, atmosphere, lithosphere and hydrosphere, as well as man-made environments like anthropogenic ecosystems and physical structures.
6. BBA Part1_1 (Gajaseni, 2001)6
Q 1. What is living object?
Q 2. What are differences
between living and non-living
objects?
7. BBA Part1_1 (Gajaseni, 2001)7
A. From biological perspective:
Life = biosystems organized by
interactions between biological
components interacting with physical
environments, and become a unified
whole with capacity to maintain
homeostasis and self-perpetuation
8. BBA Part1_1 (Gajaseni, 2001)8
Sign of life
1. Highly complex organization =
all other characteristics of life
emerge from an organism’s
complex organization
9. BBA Part1_1 (Gajaseni, 2001)9
2. Self-homeostasis =
Self-maintenance of a
steady-state internal
environment in the
variations of external
environment.
13. BBA Part1_1 (Gajaseni, 2001)13
4. Growth and development =
the increment of volume and
changes in structure and
functions to suit with new
form of life
25. BBA Part1_1 (Gajaseni, 2001)25
From biological perspective,
these are biological
spectrum
Biotic components
26. BBA Part1_1 (Gajaseni, 2001)26
รรร biotic
component
Cell
Gene
Org
an
Organi
sm
Popula
tions
Comm
unities
27. BBA Part1_1 (Gajaseni, 2001)27
Biotic components cannot
survive in isolation.
They must interact with physical
or a biotic environments.
28. BBA Part1_1 (Gajaseni, 2001)28
Generalized diagram of inputs, throughputs,
and outputs in a system
System Throughputs (flows)
System Inputs
System Outputs
Information
Energy
Matter
Useless
information
Waste heat
Waste
matter
29. BBA Part1_1 (Gajaseni, 2001)29
Interaction between each biotic
level with physical environment
through energy, matter, and
information produces
characteristic functional system.
"Biosystem" or "life"
30. BBA Part1_1 (Gajaseni, 2001)30
Organizational hierarchy in nature
can be seen from "universe"
down to "subatomic particles".
31. BBA Part1_1 (Gajaseni, 2001)31
รรร solar
system
Milky way
Galaxy
Universe
Solar system
Earth
32. BBA Part1_1 (Gajaseni, 2001)32
The natural world is organized,
diverse, dynamic, and yet
complex.
33. BBA Part1_1 (Gajaseni, 2001)33
Q. How can life be
seen in nature?
A. A hierarchy of
organization of matter.
40. BBA Part1_1 (Gajaseni, 2001)40
Transparen
cy 78
Fig 6-5 summary of the evolution
of the earth and its life.
Chemical
evolution
1 billion
years
Biological
evolution
3.7 billion
years
42. BBA Part1_1 (Gajaseni, 2001)42
Q. What is the difference of
“interaction between man and
environment” and “interaction
between other organisms and e
nvironment”?
46. BBA Part1_1 (Gajaseni, 2001)46
1. Natural environment:
4 spheres
1.1 Biosphere = Space occupied by life
1.2 Atmosphere = Space occupied by air
1.3 Lithosphere = Space occupied by solid
1.4 Hydrosphere = Space occupied by
water