"Try to classify living things" Classification according to the characteristics of living things PPT courseware 7

Description

"Try to classify living things" Classification according to the characteristics of living things PPT courseware 7

teaching objectives:

1. What is the basis for classifying organisms?

2. How to classify organisms according to their characteristics?

Think about it, discuss it

If you want to understand the growth, development and behavior of the cabbage butterfly, which one among these books would you choose to read? If you want to know more about moths and frogs, which books should you consult?

To learn about the growth, development and behavior of the cabbage butterfly, you can choose to read the book "Butterflies"; to learn about moths, you can read "Entomology" and "Invertebrate Zoology"; to learn about frogs, you can read "Zoology".

Preview test:

1. The basis for classifying organisms is based on the similarity of characteristics of organisms in terms of _____ and _____.

2. The organs of angiosperms can be divided into vegetative organs _____, _____, _____ and reproductive organs _____, _____, _____.

3. Fungi can be divided into groups such as _____ and _____.

Review: Plant groups learned

Algae: Most of them live in water and have no roots, stems or leaves. They reproduce by producing spores.

Bryophytes: Some have stems and leaves, no conductive tissue, and only rhizoids (which only serve to anchor the plant and cannot absorb water and inorganic salts). They reproduce by producing spores.

Ferns: have roots, stems, leaves, and conductive tissue. Reproduce offspring by producing spores.

Gymnosperms: roots, stems, and leaves are developed, and the seeds are exposed without pericarp coating.

Monocotyledonous plants: There is only one cotyledon in the seed embryo, and the leaf veins are generally parallel veins.

Dicotyledonous plants: There are two cotyledons in the seed embryo, and the leaf veins are generally reticular veins.

【Summarize】

1. Animal classification basis:

In addition to comparing the external morphological structure, the physiological functions of animals are also compared.

2. Classification of bacteria and fungi

(1) According to the shape of bacteria, they are divided into: rod-shaped, spiral-shaped, and spherical.

(2) According to the morphological and structural characteristics of fungi, they are divided into: yeast, mold, etc.

summary

1. Basis for biological classification:

⑴ Basis for plant classification

The morphological structure of plants; flowers, fruits, and seeds are often used as important basis for classification

⑵ Basis for animal classification

The characteristics of animals in terms of morphological structure, internal structure and physiological functions.

2. Classification of plants and classification of animals

Classification of commonly used items

Classroom test:

1. Determine whether some of the statements are correct.

(1) The morphological structures of the roots, stems, leaves, flowers, fruits and seeds of angiosperms can be used as the basis for classification. ( )

(2) In addition to comparing morphological structures, animal classification often also requires comparing physiological functions. ( )

2. Among angiosperms, flowers, fruits and seeds are often important basis for classification. Why?

Flowers, fruits and seeds have short survival times, are less affected by the environment, and have relatively stable morphological structures, which can more accurately reflect the evolution and genetic relationships between different plants.

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For more information about the PPT courseware "Classification Based on the Characteristics of Living Things Try to Classify Living Things", please click Classify Based on the Characteristics of Living Things ppt Try to Classify Living Things ppt tag.

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Update Time: 2024-11-21

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

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