1.

Write any three common characteristic features of the following phyla of invertebrates and classes of vertebrates.

Answer»

1. Protozoa :

  • Single-celled eukaryotes.
  • Locomotion is done by pseudopodia.
  • The nutrition is either autotrophic or heterotrophic.

2. Platyhelminthes:

  • This Phylum includes flatworms.
  • Excretion and osmoregulation occur through flame cells.
  • These worms are hermaphrodites having both male and female reproductive organs in a single individual.

3. Mollusca:

  • Soft-bodied animals without segmentation.
  • The body is covered by a mantle and a shell.
  • Respiration is carried through gills or lungs or both.

4. Class Reptilia:

  • The body is covered by an exoskeleton of homy epidermal scales.
  • The respiration is by lungs.
  • The heart is three-chambered, except crocodile, which has four chambers.-

5. Class Mammalia:

  • They have epidermal hairs, sweat, sebaceous and scent glands.
  • The mammary glands are the modified integumentary glands.
  • The external ear or pinna is present in most of the mammals.


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