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

Description

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

1. Molluscs

Observe the internal structure of the constricted razor clam. There are two calcareous shells of similar size outside the constricted razor clam, so it is called a bivalve and plays a ______ role. The soft body surface inside the shell is covered with ____________, and the shell is formed from the secretions of ____________. The razor clam moves slowly by ______. Breathe with ______. Ingesting food during ____________.

Snails have a spiral shell and rely on large, flat feet to crawl. The glands in the feet secrete mucus, which can reduce the friction between the feet and the ground when crawling. The head has sensory organs such as antennae and eyes.

The squid has a vestigial shell inside its body, a pair of well-developed eyes, and 10 arms and legs used for hunting. It can move quickly with the help of the reaction force of the water sprayed from the funnel. When encountering enemies, it can also spray out the ink in the ink sac to cover its escape.

What do molluscs have to do with human life?

Food: Shellfish are rich in protein and vitamins, 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

In-class testing

l. In what environment can river mussels not be collected ( )

A. The bottom of the river B. ocean bottom

C. The bottom of a pond D. bottom of lake

2. The following animals are all molluscs: ( )

A. mussels, earthworms, snails B. snails, mussels, squid

C. Squid, polyps, roundworms D. Mussels, earthworms, snails

3. How do river clams breathe? ( )

A. Gills B. shell c. Mantle D. lung

4. Which of the following statements about snails is incorrect; ( )

A. Snails live in the water and are benthic.

B． Snails are harmful to agricultural production

C. The snail’s abdominal legs are well muscled

D. There is a shell on the surface of the snail's body

5. The hard structure that protects the soft body of the river mussel is __________, which is formed from the secretions of __________.

2. Arthropods

discuss

Compare the observed animal morphological and structural characteristics and complete the P15 form

Try to find the common characteristics of the above animals

Main characteristics of arthropods:

The body has a tough exoskeleton;

The body and appendages are segmented.

Basic characteristics of insects:

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

It has two sensory whiskers on its head, one pair of wings and two pairs of legs.

The body is divided into the head, chest and abdomen, with flesh inside and bones outside.

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-class testing

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

A crab, fly B sheep, cow

C frog, scarab beetle D snail, leech

2. (1) The body of a locust is divided into three parts: I_____, II_____, and III_____

(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) ④ is _____, which is the portal through which gases enter and exit when the locust breathes, which is equivalent to the stomata on the epidermis of plant leaves.

Keywords: teaching courseware for the main groups of animals, teaching courseware for molluscs and arthropods, download PPT courseware for eighth-grade biology volume 1 of the People's Education Edition, download courseware for eighth-grade biology slides, download PPT courseware for the main groups of animals, molluscs and arthropods PPT courseware download, .PPT format;

For more information about the "Main Groups of Animals Molluscs and Arthropods" PPT courseware, please click the "Main Groups of Animals ppt Molluscs and Arthropods ppt" tag.

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

"Mollusks and Arthropods" Main groups of animals PPT courseware 7 Main characteristics of linear animals: The body is slender and cylindrical; there is a cuticle on the body surface; there is a mouth and anus. Main characteristics of annelids: The body is cylindrical and consists of many similar body segments;..

"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...

File Info

Update Time: 2024-10-30

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

Preview