2. Arthropods are animal with
jointed legs. Body Segment
into two or three sections, and
covered with exoskeleton that
may be composed of chitin or
biomineralized with calcium
carbonate

3.  The exoskeleton protects the
organs, gives support to the body,
allows efficient locomotion.
 Arthropods are dioecious.
 Fertilization is either internal or
external
 Arthropods have three or more
pairs of legs attached to the
thorax or abdominal region.

5. Have the following characteristics:
 The presence of three distinct body
divisions: head, thorax and
abdomen
 One pair of antennae
 Mouth parts composed of one pair
of mandibles and one pair of
maxillae that are adapted for
chewing, sucking and biting
 Three pairs of legs on thorax

6.  A pair of compound eyes
 Tracheal respiratory system composed
of tubes, with holes (spiracles) through
the body that admit air.
 Presence of wings that may be one
pair or two pairs and may vary in
texture
 A life cycle (metamorphosis) that may
be holometabolous and
hemimetabolous. Other species do not
undergo a life cycle or ametabolous.

7. - It refers to the stages in the
development of an insect.
The stages in metamorphosis are: egg,
larva, pupa and adult
- Each stage in the life cycle bears no
resemblance to their adult parents.
- Metamorphosis consisting of all these
three stages is described as
complete metamorphosis or
holometabola

9.  Some insects undergo incomplete
metamorphosis or hemimetabola
when the larval stage is not
conspicuous.
 The young called nymph (if
terrestrial) or naiad (if aquatic) that
emerges from the egg resembles
the parent, but differs only in size
and in the presence of some parts

11.  In other insects, the young that emerges
from the egg undergoes little or no
structural changes, as they grow older.
Such pattern of development is called
ametabola

12.  Class Insecta is divided into
different orders. The members of
the different orders differ in the
number and type of wings, type
of mouthparts and type of
metamorphosis.