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Welcome to Lab Day
Identifying Microscope
Slides
Lab Activity
• In the Classroom you will learn about 8
different slide specimens.
• In the lab, you will go from station to
station to view different specimens under
the microscope.
• Your Job: Draw and label from prepared
slides.
Some Specimens
Amoeba
Human Skin
Hyaline
Cartilage
Yeast Cells
Hydra
Pollen
Grains
Spirogyra
vegetative
Typical
bacteria
Amoeba
• The amoeba is a tiny,
one-celled organism.
• Amoebas live in fresh
water, in salt water, in
wet soil, and in
animals.
• Amoebas eat algae,
bacteria, and plant
cells.
Amoeba
• Amoebas move by
changing the shape of
their body, forming
pseudopods
(temporary foot-like
structures).
• The word pseudopod
means “false foot.”
Human Skin
• Skin is your protective
layer.
• It keeps germs and
water out.
• Skin keeps your body
fluids and salts in.
• Your skin contains
glands which
manufacture sweat.
Human Skin
• Skin is alive.
• It has many sheets of
layers of flat, stacked
cells in which you’ll
find nerves, blood
vessels, hair follicles,
glands, and sensory
receptors.
Skin Factoids
• As an adult, you may
have more than 20
square feet of skin.
• You are likely to shed
some 40 pounds of
skin in a lifetime.
Skin Fact
• Right now there are
over a million dust
mites; microscopic
critters invisible to the
naked eye, on your
mattress and pillow,
chomping on the dead
skin cells that fell off
you last night.
Cartilage
• Cartilage is usually
found in close
association with bone.
• It is a type of
connective tissue.
• Cartilage is tough,
semi-transparent,
elastic and flexible.
Cartilage Functions
• Reduces friction at
joints.
• Cartilage joins bones
firmly together.
• Acts as a shock
absorber.
• Provides sturdiness
without impeding
movement.
Yeast Cells
Yeast Cells
• Yeast are eukaryotic
microorganisms
classified in the
kingdom Fungi.
• By fermentation, the
yeast species converts
carbohydrates to
carbon dioxide and
alcohols.
Yeast Cells
• Yeasts are unicellular,
although some species
with yeast forms may
become multicellular
through the formation
of strings of connected
budding cells known
as pseudohyphae.
Hydra
• Hydra is a genus of
small, simple, freshwater animals that
possess radial
symmetry.
• Hydra are predatory
animals.
Hydra
• Biologists are
especially interested in
Hydra due to their
regenerative ability;
and that they appear
not to age or to die of
old age.
Hydra
• Hydra mainly feed on
small aquatic
invertebrates such as
Daphnia and Cyclops.
• When feeding, Hydra
extend their body to
maximum length and
then slowly extend
their tentacles.
Mixed Pollen
• The pollen grain is the
structure used to
transport the male
gamete (DNA) to the
female part of a
flower.
• Pollen grains are
microscopic.
Pollen Grains
• Just a pinch of pollen
powder contains
thousands and
thousands of grains.
• The outer wall of
pollen is composed of
a substance called
sporopollenin which is
very tough.
Pollen Grains
• Most species of pollen
have some level of
allergenicity but some
are particularly
notorious for inducing
symptoms of hay
fever.
Pollen Grains
• Grass pollen affects
about 95% of all hay
fever sufferers and
birch tree pollen
affects about 20%.
• One of the most
allergenic species on
an international level
is the wind pollinated
ragweed.
Spirogyra Vegetative
• Spirogyra is a green
algae.
• It can be found all
over the world in fresh
water habitats such as
ponds, lakes, and slow
flowing streams. It
can even survive in
Antarctica!
Spirogyra
• The whole filament is
covered by a thin,
sticky layer of
mucilage (think of it
as glue) which causes
many filaments to
stick together forming
a huge spirogyra mass.
Spirogyra
• Oxygen released
during photosynthesis
becomes trapped in the
huge filamentous mass
which causes it to
float.
Typical Bacteria
• Bacteria grow in a
wide variety of
habitats and
conditions.
• When most people
think of bacteria, they
think of diseasecausing organisms.
Bacteria
• Streptococcus
bacteria, shown in this
picture, is growing in
a culture.
• It was isolated from a
man with strep throat.
• Disease-causing
bacteria are known as
pathogenic bacteria.
Bacteria
• While pathogenic
bacteria are notorious
for such diseases as
cholera, tuberculosis,
and others, such
disease-causing
species are a
comparatively tiny
fraction of the bacteria
as a whole.
Lab Safety
• Wild play and practical jokes are forbidden
during labs.
• Keep lab and work space neat and clear.
• Report any unsafe activities.
• Stay on task.
• No running or excessive voices.
Violators will lose lab privileges!
Microscope Care
• Handle Gently
• Do not turn light switch off and on.
• Do not adjust magnifying lenses, they are
already set.
• Focus slowly and in small increments.
• Call teacher or aide if you need help.
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