"Mollusks and Arthropods" Main Groups of Animals PPT Courseware 2

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"Mollusks and Arthropods" Main Groups of Animals PPT Courseware 2

By studying this section, you will know:

1. What are the main characteristics of molluscs and arthropods?

2. What is their relationship with human life?

Mollusk

(1) Representative animals - bivalves

river mussel

scallop

Clam (gé)

Hanged razor clam (chēng)

The living environment of river clams

1. Living environment - rivers, lakes and swamps

What do river clams use to protect their soft bodies?

2. Appearance - The body is covered with two sheets of limestone ________, which function as _____;

3. Body - The body is soft, has ____________ on its surface, and its secretions form ______. The nacre secreted by ____________ wraps the foreign objects that invade the body layer by layer to form pearls;

4. Exercise - use ______ to move slowly;

snails

The head is well developed, with a pair of antennae and a pair of eyes. The eyes are born on the tops of the antennae (stalks). The radula in the mouth is extremely developed and is used for feeding and drilling. The feet are located on the ventral surface of the body, so they are called "gastropods". The shell is spiral shaped.

Do all mollusks have shells and legs?

The shell of the squid has degenerated into a sea sheath, which is located in the shell sac under the skin on the back of the body and has important medicinal value.

The squid's legs are specialized into wrists and funnels, which are its main locomotion organs.

2. Arthropods

Arthropoda is the largest phylum in the animal kingdom, including the well-known shrimps, crabs, spiders, mosquitoes, flies, centipedes and extinct trilobites. There are more than 1 million known living species, accounting for 75% of all living species; arthropods can live in water, land, and air.

1. Representative animal - locust

Complete the following questions by observing and combining the illustrations on page P15 of the textbook:

(1) What are the parts of a locust’s body? What are the characteristics?

(2) Name the numbers 1 to 9 in the picture

(1) The body of a locust is divided into three parts: I____, ____, and ____

(2) The chest has ____ pairs of feet and ____ pairs of wings.

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

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

Insect wings: These wings are elytra. Insects with elytra belong to the order Coleoptera, such as scarabs and beetles.

What do insect wings and bird wings have in common?

All are fan-shaped:

Large surface area, light, thin: all are pulled by muscles.

What is the importance of wings to the life and distribution of insects?

(1) Looking for food

(2) Avoid enemies

(3) Looking for a spouse

(4) Find a suitable place for spawning

________ is the only invertebrate animal that can fly.

The movement of wings can expand the living and distribution space of insects, which is of great significance to their survival and reproduction.

Small scale chopper

1. The common characteristics of river mussels, snails and squids are ( )

A. All have shells B. All have mantle C. They all use their abdominal legs to move D. They all use their arms and legs to catch food.

2. The locomotor organ of river mussel is ( )

A. Gastropods B. Brachiopod C. Ax foot D. cilia

3. The structure that can form a pearl is ( ).

A. shell b. Mantle C. nacre D. Ax foot

4． The correct place to collect snails is ( ).

A. Dry, sunny grassland B. Damp trees, corner

C. Wet ground D. in soft soil

5. How do river clams complete respiration ( )

A. As water flows through the gills, gases are exchanged between the water and the capillaries in the gills

B． River mussels always have part of their bodies above the water, allowing their gills to exchange gases in the air.

C. Capillaries in the mussel's lungs exchange gases with water

D. The lungs of the river mussel need to exchange gases with the air

6. The common characteristics of arthropods and annelids are ( )

A. The body is made up of many body segments B. The body is made up of many body segments and is divided into

C. Metamorphosis D. Has an exoskeleton

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Update Time: 2024-10-26

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

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