BIOLOGY [3 marks Question Answer]

Arachnids – Scorpion, spider.
Crustaceans – Crab, lobster, prawn.
Myriapods – Millipede, centipede.
Insects – Fly, ant, moth.

Cnidarians – Jelly fish, Hydra, sea anemone.
Platyhelminthes – Liver fluke, tapeworm.
Nemathelminthes – P inworm, Ascaris.

On the basis of food they eat, animals are classified as –
1. Herbivores – They eat only green plants as food. Examples : cow, goat, etc.
2. Carnivores – They eat only the flesh of other animals as food. Examples : tiger and lion, etc.
3. Omnivores – They eat both plants as well as the flesh of other animals as food.
Examples : bear, crow, man, etc.

Exoskeleton is a tough outer covering of an animal body. e.g. Crab, lobster have exoskeletons.

Insects :
a. Body of insects is divided into three regions-head, thorax and abdomen.
b. Most of them have three pairs of legs.
c. Most of them have wings.
d. e.g. Housefly, butterfly.
Crustaceans:
a. Head and thorax are fused in crustaceans.
b. They have many number of jointed legs.
c. Wings are absent.
d. e.g. Crab, lobster.

Amphibians :
a. They can live both on land and in water.
b. Body of amphibians is covered with slimy- with scales.
c. They breathe through lungs and skin.
d. e.g. Frogs, toad.
Pisces :
a. They live in water.
b. Their body is covered slippery skin.
c. They breathe through gills.
d. e.g. Shark, sea-horse.