HOM (1)

HOMEOSTASIS
HOMEOSTASIS
WHAT IS
HOMEOSTASIS?
is a key concept in understanding how our body works. It
means keeping things constant and comes from two Greek
words: 'homeo,' meaning 'similar,' and 'stasis,' meaning
'stable.'

H O M E O S T A S I S
I N P L A N T S
.
Homeostasis is the property of living
organisms in which internal systems
are kept in balance.
Angiosperms or
flowering plants
maintain homeostasis
by keeping their
stomata (opening in
the underside of a leaf
that allows carbon
dioxide to diffuse into
and out of the leaf)
open just enough to
allow photosynthesis
to take place but not
so much that they lose
an excessive amount
of water. They
regulate the opening
and closing of their
stomata to balance
water loss with rates of
photosynthesis.
Plants stay cool in the
desert heat through
their reflective surfaces,
reduced leaves, or
leaves that are parallel
to the sun. Tropism
occurs when a plant
grows towards or away
from a stimulus. Plants
must balance the heat
they gain with the heat
they lose.

P L A N T S A N D
T H E I R
S T R U C T U R E
1) shoot system - above ground and includes the
organs such as leaves, buds, stems, flowers (if the
plant has any), and fruits (if the plant has any)
TWO ORGAN
SYSTEMS
2) root system - includes those parts of the
plant below ground, such as the
roots, tubers, and rhizomes.

DERMAL
TISSUE
P L A N T T I S S U E
T Y P E S
composed of epidermal cells, closely
packed cells that secrete a waxy cuticle
that aids in the prevention of water
loss.
VASCULAR
TISSUE
Plant cells are formed at
meristems, and then develop
into cell types which are
grouped into tissues.
GROUND
TISSUE
comprises the bulk of the primary
plant body. Parenchyma, collenchyma,
and sclerenchyma cells are common in
the ground tissue.
includes xylem, phloem,
parenchyma, and cambium
cells

H O M E O S T A S I S
I N A N I M A L S
is the way animals maintain a stable internal
balance in their body.It allows animals to function
in the changing external conditions surrounding
their body
Osmoregulati
on is an
example of
homeostasis.
It is way
osmosis is
controlled by
salmon to
maintain a
water balance.
For warmblooded
animals such
as mammals
and birds,
homeostasis
is a
combination
of internal
processes
involving
hormones,
the endocrine
system and
metabolism.
Out of all six
kingdoms, the animal
kingdom is most
likely the one that you
already know the
most about. After all,
we are a part of this
vast group. While the
characteristics of
animals vary greatly,
there are a few things
that they all
share. Animals are
eukaryotic,
multicellular
organisms that do not
have cell walls, get
their nutrients by
ingestion, and are
capable of movement.

M A I N
C H A R C T E R I S T I C S
O F A N I M A L S
There are four main characteristics that are
used to classify animals: symmetry, body
cavity, tissue, and vertebral column.
The first
characteristic is
symmetry. Animals
generally fall into
two categories - they
either have radial or
bilateral
symmetry. Organis
ms like sea stars
have radial
symmetry, while
organisms such as
humans have
bilateral symmetry
The next thing is
body tissue. The
more complex an
organism is, the
more distinctive
layers of tissue it has.
There are three
main layers:
Ectoderm - the
outermost layer
Endoderm - the
innermost layer
Mesoderm - the
middle layer
As for vertebral
column, there are
two key groups:
invertebrates and
vertebrates. Inverteb
rates are animals
without a backbone,
while vertebrates are
animals with a
backbone. As we
look at the evolution
of animals, we will
first look at the more
simple invertebrates
and then consider
the more complex
vertebrates.