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

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

Think about it, discuss it

Do you like the shells in the picture? What do animals with these shells look like? Do hard shells hinder an animal's movement?

think:

1. What is the function of shells?

2. What structure does the animal you observe rely on to move? And what structure does it rely on to breathe?

3. Try to think about how it gets food?

Do all mollusks have shells?

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.

4. The relationship between molluscs and human life

① my country’s total aquaculture production ranks first in the world, and its shellfish production also ranks first in the world.

2. Arthropods

——Arthropods are the largest group of animals,

There are currently more than 1.2 million named species, accounting for more than 80% of all known animal species.

1. Compare the morphological and structural characteristics of the animals you observed and complete the table below.

2. Which animals in the table above have similar morphological structures? Try to talk about their common characteristics.

3. Can you summarize the common characteristics of all animals in the table.

Characteristics of locusts

1. The body is divided into three parts: ______, ______, and ______;

2. There are one pair of ______, three pairs of ______, two pairs of ______, antennae and feet (appendages) ______;

3. The abdomen contains internal organs.

4. Breathe

The respiratory organ of the locust is ______, which communicates with the outside world through the valve. The valves are located at ______ and ______, there are ______ pairs in total.

P17 exercises

1. Decide whether the following statements are correct. Mark “√” for correct answers and “×” for wrong answers.

(1) Molluscs are born in shells. ( )

(2) The appendages of arthropods are segmented, but the body is not. ( )

2. Among the following statements about animals’ living environment and ways of obtaining food, which one is correct ( )

A. Coelenterates live in water and use stinging cells to help capture food;

B. The parasite lives on the host's surface or inside its body throughout its life, and survives by obtaining nutrients from the host's body;

C. Molluscs live in water and rely on water inlet and outlet pipes to obtain food particles in the water;

D. Arthropods live on land and use their mouthparts to obtain food.

3. Use lines to connect the following animal groups with their corresponding characteristics.

Coelenterates have flat bodies with mouths but no anus

Platyhelminthes have segmented bodies, and their locomotive organs are setae or warty feet.

Linear animals have a mantle on their body surface

Annelids have segmented bodies and appendages and have exoskeletons

Molluscs have stinging cells on their body surface

Arthropods have unsegmented bodies and have cuticles on the body surface

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: 2024-06-19

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

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