Download Classification of Animals

Classification of invertebrates
Q What are invertebrates? Give examples.
A: Animals without backbones are called
invertebrates. Ex jellyfish, spider and crabs don’t have
back bones.
Q How many kind of invertebrates are there on the
earth?
A: Almost 90% of all animals are invertebrates. There
are about 1, 200, 000 kinds of invertebrates.
What are the main groups of invertebrates?
A: 1) Invertebrates with jointed legs. 2) Invertebrates
without jointed legs.
Classification of invertebrates
Insects, Arachnids, Molluscs
Insects: six legs, three body parts, eg ants, wasp,
butterfly.
Arachnids: 8 legs, no antennae and two body parts.
like spider, scorpion and ticks..
Molluscs: have a muscular foot for movement and
often have a shell. Like snails, octopus, slugs and
squids.
Q Write the characteristics of invertebrates with
jointed legs.
A: 1) They have three body parts- head, thorax and
abdomen. 2) Have a hard skin on the outside called
exoskeleton. 3) Have 6 legs.
Give examples of invertebrates without jointed legs.
A: Three pair of legs = these are the insects. They
form about 90% of all invertebrates. Ex butterfly,
cockroach, ants and praying mantis.
Four pair of legs = Example spider and scorpion.
More than four pair of legs = Example shrimps, crabs,
centipedes and millipedes.
Q Write the characteristic of an insect.
A: Insects 1) have six legs. 2) have three body partshead, thorax and abdomen. 3) have a pair of feelers
on their head. 4) Some have one or two pair of wings.
Some don’t have wings.
Name some insects which don’t have wings.
A : Ant and silverfish.
Name some insects which have one pair of wings.
A: Housefly and mosquito
Name some insects which have two pair of wings.
A: Butterfly and dragonfly.
Q Give examples of animals that have four pairs of
legs.
A: Spider and scorpion.
Q Give examples of animals that have more than
four pair of legs.
A: Shrimps, crabs, centipedes and millipedes.
Give examples of invertebrates without jointed legs.
A: 1) Worm like animals
a) Some of these have segmented body like earthworm.
b) Others don’t have segmented body like flatworm.
2) Non worm like animals
a) Some have shells like snails and shellfish.
b) Some do not have shells like jellyfish and starfish.