"Mollusks and Arthropods" Main Groups of Animals PPT Courseware 4

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"Mollusks and Arthropods" Main Groups of Animals PPT Courseware 4

1. Roundworms live in the human small intestine and live by sucking semi-digested chyme in the small intestine. Its body is ______. There are ______ at the front end, ______ at the back end, and ______ on the body surface, which can play a protective role. ______ has a simple structure. The intestine is composed of only one layer of cells and digests chyme. The ______ organs are well developed and there are no specialized ______ organs.

2. Linear animals mainly include ______, ______, ______, ______, ______, etc.

3. The main characteristics of linear animals are: ______, ____________, ____________.

【learning target】

1. By observing the pictures, recognize the morphological structure of the constricted razor clam and summarize the main characteristics of the molluscs; be able to name the functions of several molluscs.

2. By observing pictures, recognize the morphological structure of arthropods and summarize the main characteristics of arthropods; be able to describe the functions of arthropods that are closely related to humans.

【Cooperative Research】

1. Observe the pictures and internal structure diagrams of the constricted razor clam and discuss the following questions:

①What is the function of shells?

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

③Try to think about it, how does it get food?

1. There are more than ___ species of mollusks, which are the largest group in the animal kingdom. ＿, ＿＿＿, ＿＿, ＿＿, etc. are molluscs. They have two pieces of calcareous material of similar size on the outside, also called __＿. Inside the shell, the body surface of __________ is wrapped with a fleshy membrane like a coat, called __________. The shell is formed by substances secreted by __________.

2. Bivalves can move slowly with ____, inhale water through the ____ at the back end of the body, and then discharge it through the outlet pipe____. In the process of inhaling and expelling water, take in the ____ in the water and expel the undigested __, and use the ____ and the water flow to ____________.

3. In addition to bivalves, mollusks include ＿＿, ＿＿, ＿＿. Their main characteristics: ＿＿, ＿＿＿＿; ＿＿＿＿＿.

4． Many molluscs can be cultivated artificially. China's total amount of molluscs ranks first in the world, and its production of molluscs ranks first in the world. Oysters, scallops, __________, etc. are rich in __________ and multiple vitamins, and have low __________ content. Abalone shells (＿＿＿＿), squid shells (＿＿＿＿＿), ＿＿＿ can be used as medicine, and snail shells and pearls are very good ＿＿＿＿＿＿＿. However, the snail is the intermediate host of __________ and is related to the spread of __________.

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Update Time: 2024-06-30

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

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