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"Mollusks and Arthropods" PPT courseware on the main groups of animals
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 pieces of calcareous _____, 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;
Do all molluscs 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.
The relationship between molluscs and human life
The relationship between molluscs and human life: used in aquaculture to ____; can be imported into ____; used to make ____; have certain hazards. For example, snails are the intermediate host of ____ and are related to the spread of schistosomiasis.
There are 1.5 million species of arthropods and 1 million species of insects. Insects account for 2/3 of animals and are the largest class in the animal kingdom. They are found everywhere in the biosphere, which is inseparable from their strong athletic abilities.
(1) Living in the air: bees, wasps, dragonflies, flies, mosquitoes, gadflies, butterflies, etc.
(2) Living on the surface: walking bugs (farting bugs), cockroaches, etc.
(3) Living in the soil: mole crickets, cutworms (larvae of armyworms), larvae of cicadas, etc.
(4) Living in water: stink bugs, field beetles, turtle bugs, stink bugs, etc., Coleoptera dragonflies, water turtles, dragonflies, caddisflies, mayflies, etc.
(5) Parasitic life: fleas, lice, etc.
Group experiment: Observing locusts
Objective requirements: Tell the morphological characteristics of locusts.
Materials and tools: locusts, magnifying glass, tweezers, dissection tray, etc.
Method steps: 1. Observe the body parts of the locust
2. Observe the segmentation of the locust’s thorax, abdomen, feet, and antennae.
3. Observe the locations of the locust’s feet and wings as well as the characteristics of the wings.
4. Observe the position of the locust valve.
5. Gently pinch the body of the locust and feel what it feels like?
Characteristics of insects
Insects not only have the characteristics shared by arthropods, but also have their own unique characteristics:
Two pairs of _____, three pairs of ____, the body is divided into three parts ____.
What do insect wings and bird wings have in common?
All are fan-shaped:
Large surface area, light and thin:
All are pulled by muscles.
Class summary
Molluscs 1. Characteristics 2. Examples
arthropods
1. Arthropods are the most diverse and widely distributed type of invertebrates in the biosphere.
2. The body is divided into segments. The body, legs and antennae are equally segmented, and there is an exoskeleton on the body surface.
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"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 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? ..