"Try to classify living things" Classification according to the characteristics of living things PPT courseware 2

Description

"Try to classify living things" Classification according to the characteristics of living things PPT courseware 2

learning target:

1. Try to classify plants and animals based on their main characteristics.

2. Describe methods of classifying organisms.

3. Pay attention to the significance of biological classification.

Learning focus: Classify plants and animals according to their main characteristics.

Learning difficulties: methods of biological classification.

Preview outline

1. What is the basis for classifying organisms?

2. How to classify organisms according to their characteristics?

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.

[Inquiry and thinking]

1. Which category among A, B, C, D, E and F do the plants in the picture belong to?

2. Do plants A, B, C, D, E, and F belong to the same classification level? do not belong to the same classification level.

3. What groups can plants with seeds be divided into? They are divided into angiosperms and gymnosperms according to the presence or absence of pericarp.

4. What groups can seedless plants be divided into? Algae, bryophytes, ferns

5. What is the order from simple to complex for the above-mentioned plant groups? Algae, bryophytes, ferns, gymnosperms, angiosperms

6. What characteristics were considered in the above classification of plants?

Taking into account the similarity of morphological and structural characteristics of roots, stems, leaves, flowers, fruits, seeds, etc.

【Summarize】

1. Basis for biological classification

The similarity of biological characteristics in terms of morphological structure and physiological functions.

2. Biological classification significance

Clarify the genetic and evolutionary relationships between different groups, and understand and protect biological diversity.

【discuss】

1. Divide these 10 animals into two groups. How should they be divided? What animals are in each group?

According to whether there is a spine in the body, animals are divided into two groups: invertebrates and vertebrates.

2. If the animals in each group are classified again, what categories can they be divided into? What animals are in each category?

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: 2024-08-01

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

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