Lesson 34 How do insects develop Insects are

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Lesson 34 How do insects develop?

Lesson 34 How do insects develop?

Insects are by far the largest single group of invertebrates. Nearly one million insect

Insects are by far the largest single group of invertebrates. Nearly one million insect species have been classified so far! Scientists believe that there as many as 10 million insect species! Each species probably contains billions of members.

That is one heck of a lot of insects crawling and flying around this

That is one heck of a lot of insects crawling and flying around this earth! How do insects develop? All insects develop from eggs. When it hatches, it usually does not look like the adult.

Insects grow into adults by means of metamorphosis. Metamorphosis means a change into a

Insects grow into adults by means of metamorphosis. Metamorphosis means a change into a new form. There are 2 kinds of metamorphosis: Complete and Incomplete

Complete Metamorphosis You have seen butterflies flying around the flowers. Just a short time

Complete Metamorphosis You have seen butterflies flying around the flowers. Just a short time before, that butterfly was a caterpillar.

That caterpillar made a complete body change to a butterfly. It underwent a complete

That caterpillar made a complete body change to a butterfly. It underwent a complete metamorphosis.

Some insects that develop by complete metamorphosis are butterflies, mosquitoes, flies and bees. There

Some insects that develop by complete metamorphosis are butterflies, mosquitoes, flies and bees. There are 4 stages to complete metamorphosis.

Our butterfly started out as an egg.

Our butterfly started out as an egg.

It hatched, and it was in the larva stage. (caterpillar)

It hatched, and it was in the larva stage. (caterpillar)

After hanging out for a while as a caterpillar, it rests in the pupa

After hanging out for a while as a caterpillar, it rests in the pupa stage. While it rests, its body makes a complete change.

What comes out of the cocoon is the adult butterfly.

What comes out of the cocoon is the adult butterfly.

The adult looks nothing like the larva, does it? This is why it is

The adult looks nothing like the larva, does it? This is why it is called Complete Metamorphosis.

Incomplete Metamorphosis During incomplete metamorphosis, the change from the young stage to the adult

Incomplete Metamorphosis During incomplete metamorphosis, the change from the young stage to the adult stage is not so great. There are only 3 stages of incomplete metamorphosis.

Let’s look at the life of a grasshopper. Momma grasshoppers lay eggs in the

Let’s look at the life of a grasshopper. Momma grasshoppers lay eggs in the dirt.

Grasshopper eggs hatch into nymphs. The nymph looks an awful lot like the adult,

Grasshopper eggs hatch into nymphs. The nymph looks an awful lot like the adult, but not exactly. The nymph has a large head and no wings.

The wings develop as the nymph grows. As the nymph grows, it molts its

The wings develop as the nymph grows. As the nymph grows, it molts its skin. Molt means to shed.

A nymph will molt its skin about 5 times as it grows. After the

A nymph will molt its skin about 5 times as it grows. After the first molt, small wings appear. Each time it molts, its wings are bigger.

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