EXCRETION

1. WELCOME

2. EXCRETION IN
ANIMALS

3. AMOEBA
 Amoeba are unicellular eukaryotes with no cell wall.
 They reproduce using binary fission and move by the use
of pseudopodia.
 Pseudopodia are false feet that extend out, and then the
rest of the body follows.
 Amoeba are found in ponds, rivers and on the surface of
leaves and plants.

4. EXCRETORY ORGANS
• No special excretory organ, contractile vacuoles
function as excretory organs.
EXCRETORY PRODUCT
• Ammonia and excess water in the body.

5. EARTHWORM
• The earthworms are soft-bodied, segmented worm
• They are invertebrates, meaning they don't have
backbones.
• Most earthworms appear pink, brown or red in color.
• An earthworm has a small brain, a digestive system, a
reproductive system and a circulatory system with
five pairs of hearts.
• Earthworms breathe through their skin instead of with
lungs.

6. EXCRETORY ORGAN
• Special structures called Nephridia collect excretory products
from body cavity and e liminate through pores in the bodt
surface.
EXCRETORY PRODUCT
• Urea, ammonia and water.

7. INSECTS
• Insects are invertebrates. They have no backbones.
• Most insects walk, but some can fly and jump.
• Insects need water, air, and food to live. Insects have
three pairs of legs. They use the legs for walking, but
sometimes an insect may have a pair of legs that are
specially designed for jumping.
• Insects have two pairs of wings.

8. EXCRETORY ORGAN
• Malphigian tubules seen along with digestive tract.
They separate excretory products and eliminate along
with digestive wastes.
EXCRETORY PRODUCT
• Uric acid.

9. FISHES
• Gills are important organs for a fish, as they are
responsible for respiration.
• Fish are ectotherms, or cold-blooded. They cannot
regulate their body temperature and are dependent on
the external environment.
• Fish have a specialized sense organ called a lateral
line. It runs along the length of the body and is
situated just under the scales.
• The lateral line can detect vibrations and movements
in the water. Even if there is no light, the fish can
detect food and predators, and even navigate with the
help of lateral line.

10. EXCRETORY ORGAN
• Kidney filter the wastes and eliminate directly to
water.
EXCRETORY PRODUCT
• Ammonia

11. FROG
• Frogs belong to a group called vertebrates known
as amphibians.
• Amphibians are cold-blooded animals that can live in
both water and land.
• A frog’s skin is usually moist and thin. It does not
have scales, hair, or other protective features.
• Instead of drinking water, they absorb it through
their skin.
• Glands in the skin secrete mucus to help keep the
skin moist. Frogs also have glands that produce poison
to help them escape from predators.

12. EXCRETORY ORGAN
• Nitrogenous wastes filtered by kidneys are excreted
in the form of urine.
EXCRETORY PRODUCT
• Urea.

13. REPTILES AND BIRDS
• All reptiles have a backbone, which means they are
vertebrates.
• All reptiles produce eggs. Most reptiles lay hard-
shelled eggs, but a few give birth to live young.
• All reptiles have scales or scutes.
• Reptiles are ectothermic or cold-blooded, which
means they cannot control their own body
temperature.

14. EXCRETORY ORGAN
• Kidney filter waste products and eliminate along
with digestive waste.
EXCRETORY PRODUCTS
• Uric acid.

15. QUESTIONS
• What are the importance of excretory organs
• Which organism have no special excretory organ
• Which organisms contain malphigian tubules
• Contractile vacuoles are the speciality of
• What is the role performed by contractile vacuoles
• What is nephridia
• is the excretory products of frog

16. HOMEWORK
1. Draw the structure of amoeba and describe their
excretory system.
2. Write the different excretory products present in
earthworm.
3. Tabulate different organisms with their excretory organs
and excretory products