"Mollusks and Arthropods" Main Groups of Animals PPT Courseware 3

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"Mollusks and Arthropods" Main Groups of Animals PPT Courseware 3

1. Molluscs:

Animals with soft bodies protected by shells are called molluscs.

There are more than 100,000 species of molluscs, making them the second largest group in the animal kingdom.

2. Other molluscs: chitons, snails, squid

3. Characteristics of molluscs: (p13)

There are ______ outside the soft body, most have ______, and the motor organs are ______.

3. The relationship between molluscs and humans P13

1. Objects of artificial breeding. (my country’s total aquaculture volume ranks first in the world, and its shellfish production also ranks first in the world.)

2. Edible.

3. Medicinal uses: Cassia, sea mango, pearl powder

4. Very good decoration.

5. Spread diseases.

1. Types of arthropods:

Arthropods are the largest group of animals, with more than 1.2 million named species, accounting for more than 80% of all known animal species.

1. Observation and thinking

Insects are the most diverse arthropods and the only ones that can fly.

2. Structure and characteristics of insects: Book P15

Characteristics of locusts:

1. Head - responsible for feeling and feeding, with a pair of ______, three ______, and a pair of ______; ______ is used for feeding

2. Chest - the sports center, with three pairs of ______ and two pairs of ______;

3. Abdomen - Concentratedly accommodates ____________; ______ is used for breathing

Feet + antennae = appendages, what is the meaning of appendage segmentation?

1. The appendages contain well-developed muscles and are connected to the body, playing a very important role in enhancing movement;

2. The segmentation makes it have joints and makes it more flexible.

In this way, the arthropods have a variety of uses, such as movement, digging, hunting, sensing, cleaning, chewing, etc. This is an important factor in the ability of arthropods to fully adapt to life on land, and this is especially true for insects.

The relationship between arthropods and human life:

Shrimp, crabs, etc. provide _________ to humans and other marine life;

Bees and other insects are _________ of flowering plants;

The sloughs of scorpions, centipedes and cicadas can be used to treat diseases;

Fruit flies are very classic _________ material;

Mosquitoes and mites bite people and spread ________.

1. Among the following animals, all of them are insects ( )

A crab, fly B mosquito, fly

C centipede, scarab beetle D spider, locust

2. Locust structure: The body is divided into three parts: ＿＿, ＿＿, and ＿＿. The body surface is hard and has ＿＿.

Movement structure: three pairs __________, two pairs __________.

Sensory structure: one pair __, three __, antennae segmented.

Breathing structure: The structure of incoming and outgoing gas is ＿＿.

3. Characteristics of arthropods: body ＿＿, body, feet and antennae ＿＿, body surface has ＿＿.

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Update Time: 2024-10-18

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

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