Five classification of animals and organs of respiration

  1. Mammals: These animals are warm-blooded, have hair or fur on their bodies, and typically give birth to live young. They also produce milk to feed their babies. Examples include humans, dogs, cats, and elephants.
  2. Birds: Birds have feathers, lay hard-shelled eggs, and are equipped with beaks and strong hollow bones. They can fly and are known for their diverse range of songs. Examples include sparrows, eagles, and penguins.
  3. Reptiles: Reptiles have dry, scaly skin and lay eggs with tough, leathery shells. They are cold-blooded, which means their body temperature depends on the environment. Examples include snakes, turtles, and crocodiles.
  4. Amphibians: Amphibians have moist, smooth skin and typically undergo metamorphosis, transitioning from aquatic larvae (like tadpoles) to terrestrial adults. They are cold-blooded and often require water for breeding. Examples include frogs, toads, and salamanders.
  5. Fish: Fish are aquatic animals with gills that allow them to extract oxygen from water. They have scales covering their bodies and lay eggs. Fish come in various shapes and sizes and inhabit a wide range of aquatic environments. Examples include goldfish, sharks, and trout.

These classifications help scientists organize and understand the vast diversity of animal species on Earth.






What is Respiration?



Respitatory Organs of the animals listed above 

  1. Mammals: Most mammals have lungs as their respiratory organs. They breathe in air through their nostrils or mouth, and the air travels down the windpipe (trachea) into the lungs where oxygen is exchanged with carbon dioxide.
  2. Birds: Birds have lungs as well, but their respiratory system is more complex. They have air sacs that help in efficient breathing, allowing fresh air to flow through the lungs in a one-way direction, ensuring a continuous supply of oxygen.
  3. Reptiles: Reptiles also primarily use lungs for breathing. They draw air into their lungs by expanding their chest cavity, and the exchange of gases occurs in the lung tissues.
  4. Amphibians: Amphibians have a combination of respiratory organs. They often use their skin for respiration, absorbing oxygen directly from the environment. They also have simple lungs, which they use when they are on land. Additionally, some amphibians, like tadpoles, can respire through gills when they are in water.
  5. Fish: Fish have gills as their primary respiratory organs. Gills extract oxygen from water as it flows over the thin gill filaments, facilitating the exchange of oxygen and carbon dioxide. Some fish, like lungfish, also have a primitive lung-like structure that allows them to breathe air when water conditions are not optimal.

Each group of animals has evolved specific adaptations in their respiratory systems to suit their habitat and lifestyle.



  1. Animals breathe in __________ to get the air they need. a) food b) water c) air
  2. When animals breathe, they take in air through their __________ or mouth. a) skin b) eyes c) nose
  3. Fish have special parts called __________ that help them breathe in water. a) feathers b) gills c) scales
  4. Birds have special lungs that help them breathe even when they are __________. a) sleeping b) swimming c) flying
  5. Amphibians like frogs can breathe through their __________ when they’re in the water. a) lungs b) skin c) feathers
  6. Some animals can breathe both underwater and on land. This makes them __________ animals. a) flying b) nocturnal c) amphibious
  7. Dogs and cats breathe using their __________. a) fins b) paws c) nose
  8. In water, fish use their __________ to get oxygen from the water. a) lungs b) gills c) fur
  9. Birds have a special way of breathing called __________. a) tweeting b) chirping c) air sacs
  10. Humans and animals all need __________ to stay alive. a) water b) food c) air
  11. Some animals live in the __________, so they need to have special ways to breathe there. a) desert b) ocean c) forest
  12. Birds have feathers, and they use their __________ to breathe. a) beaks b) tails c) fins
  13. Animals like dogs and cats breathe in air through their __________. a) mouth b) ears c) tail
  14. We can’t see air, but animals use it to get __________. a) sunlight b) energy c) water
  15. Fish don’t have lungs like us. They use their __________ to breathe underwater. a) fins b) gills c) claws















Respiration in Lower Animals

  1. Five classification of animals and organs of respiration
  2. List the functions of vitamin c in the body
  3. List and discuss the elements required to prepare a Scheme of Work
  4. Define the following terms: (a) Syllabus (b) Scheme of work. Mention the elements to be considered when drawing a scheme of work.
  5. Compare and Contrast between Philosophy and Science