"Mollusks and Arthropods" Main Groups of Animals PPT Courseware 7

Description

"Mollusks and Arthropods" Main Groups of Animals PPT Courseware 7

Main characteristics of linear animals

The body is elongated and cylindrical;

There is a cuticle on the body surface;

There is a mouth and an anus.

Main characteristics of annelids

The body is cylindrical and consists of many body segments that are similar to each other;

Movement is assisted by setae or warts.

think:

What is the function of shells?

The shell protects the soft body inside

What structure does it rely on to move?

The razor clam moves slowly on its feet.

What structure does breathing rely on?

Breathe through gills.

How do razor clams get food?

Food is ingested during the process of water absorption and drainage.

The main characteristics of molluscs are:

The soft body surface is covered with a mantle,

Most have shells;

The locomotive organ is the foot.

What do molluscs have to do with human life?

Aquaculture: Shellfish (first) rich in protein and multivitamins, low in fat

Medicinal uses: abalone shell (Cassia abalone), squid shell (Astragalus), pearl powder

Conch shells and pearls make excellent decorations.

Some molluscs are also harmful to humans: snails

Basic characteristics of insects:

There are one pair of antennae, three pairs of legs, usually two pairs of wings, etc.

Are ants insects? Are spiders, centipedes and shrimps insects? Why?

The relationship between arthropods and humans:

Shrimp and crab provide animal protein.

Bees and other insects carry pollen for hundreds of thousands of flowering plants on Earth

Scorpions, centipedes, cicada sloughs, etc. can be used as medicine to treat diseases.

Drosophila is a very classic genetic experimental material

Troubles: Mosquitoes, ticks, and mites bite people and spread diseases.

In-person testing

1. Among the following molluscs, which one has a spiral shell? ( )

A river mussel B snail C squid D scallop

2. River mussels are suitable for living in water, and their locomotion organs are ( )

A gills B shell C axopod D gastropod

3. Which of the following animals are all arthropods ( )

A crab, fly B sheep, cow

C frog, scarab beetle D snail, leech

4 (1) The body of a locust is divided into three parts: I_____, _____, and _____

(2) There are _____ pairs of feet and _____ pairs of wings on the chest.

(3) The body surface has _____, which can protect and support the soft internal organs and prevent __________ to adapt to life on land

(4) is _____, which is the portal through which gases enter and exit when locusts breathe, which is equivalent to __________ on the epidermis of plant leaves.

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"Mollusks and Arthropods" Main Groups of Animals PPT Courseware 6:

"Mollusks and Arthropods" Main Groups of Animals PPT Courseware 6 1. Molluscs Observe the internal structure of the coned clam. There are two calcareous shells of similar size on the outside of the coned clam, so it is called a bivalve and plays a ______ role. The soft body surface inside the shell is wrapped in ______..

"Mollusks and Arthropods" Main Groups of Animals PPT Courseware 5:

"Mollusks and Arthropods" Main Groups of Animals PPT Courseware 5 Think about it and discuss it. Do you like the shells in the picture? What do animals with these shells look like? Do hard shells hinder animal movement? Thinking: 1. What is the function of shells? ..

"Mollusks and Arthropods" Main Groups of Animals PPT Courseware 4:

"Mollusks and Arthropods" Main Groups of Animals PPT Courseware 4 1. Roundworms live in the human small intestine and live by sucking the semi-digested chyme in the small intestine. Its body is ______. It has ______ on the front end, ______ on the back end, and ______ on the body surface. It can...

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Update Time: 2024-10-02

This template belongs to biology courseware People's Education Edition Biology for Grade 8, Volume 1 industry PPT template

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