"Structural Hierarchy of Organisms" PPT courseware

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"Structural Hierarchy of Organisms" PPT courseware

Part One Content: Test Points Focus

Test point 1: Structural levels of animal objects

1. Cells differentiate to form different tissues

(1) During the process of ontogeny, the offspring produced by one or a type of cell through division undergo differential changes in ________, ________ and ________. This process is called ________. Cells differentiate to form different cell groups. Each cell group is formed by cells with similar shapes, structures, and functions united together. Such cell groups are called ________.

(2) Basic tissues of the human body

2. Tissues further form organs

The structure of an organ that performs certain functions by combining different _________ in a certain order is called ________. For example, the brain is mainly composed of nervous tissue and connective tissue, and the stomach is composed of epithelial tissue, muscle tissue, connective tissue and nervous tissue.

3. Organ systems and the human body

Multiple _________ that can jointly complete one or several physiological functions are combined in a certain order to form a system. The human body has eight major systems: motor system, digestive system, respiratory system, circulatory system, urinary system, nervous system, endocrine system, and reproductive system.

Test point 2: Structural levels of plants

1. Green flowering plants have six major organs: roots, ________, leaves, ________, fruits, and seeds.

2. Several major tissues of plants

Test point 3 Single-celled organisms

1. single cell organism

There are many organisms in the biosphere that are difficult to see with the naked eye. Their bodies are composed of one cell, called ____________, such as _______________________________________________, etc. Most of them live in __________ environment, and some are parasitic on other organisms. physically.

2. Morphological structure of Paramecium

①Form

The body of a paramecium is rounded at the ________ end and pointed at the ________ end, shaped like a ______________.

② Structure: Write down the structure and function of the paramecium in Figure 5-1.

[1]________, whose function is_______________;

[2]________, whose function is_______________;

[3]________, its function is_______________;

PPT on the structural level of living organisms, part 2: special breakthroughs

Special Project 1 Core Concepts

1. Cells can divide and differentiate to generate more different types of cells for the growth, development and reproduction of organisms.

Example 1 [2014·Jinan] Diagrams are an effective way to help us understand biological concepts. A and B in Figure 5-2 respectively represent which physiological process of the cell ()

A． Cell division, cell division B. cell differentiation, cell differentiation

C. Cell division, cell differentiation D. cell differentiation, cell division

[Method Instructions] The key to solving this problem is to understand that cell division increases the number of cells, and the cell differentiation results in the formation of different tissues.

[Analysis] The growth of an organism is inseparable from the growth, division and differentiation of cells. Cells absorb nutrients from the surrounding environment and convert them into their own substances, and the volume increases. This is the growth of cells. When cells grow up, they will divide. The process: the nucleus first divides into two parts, and then the cytoplasm divides into two parts, and then forms New cell membranes, plant cells also form new cell walls. As a result, one cell divides into two cells, and cell division increases the number of cells. The fertilized egg divides to produce new cells. Later, a small part of these cells still retain the ability to divide, but most of them lose their ability to divide. During the development process, these cells each have different functions. They undergo differential changes in morphology, structure and physiological functions, forming a variety of cells. This process is called cell differentiation. The result of cell differentiation is the formation of tissues. A group of cells formed by cells with similar shapes, structures, and functions united together is called a tissue. Therefore, A in the figure represents cell division; B represents cell differentiation.

2. Some organisms are composed of single cells, and some organisms are composed of multiple cells.

Example 2 [2013·Lanzhou] Which of the following organisms is a single-celled organism ()

A． Paramecium b. rice

C. Locust D. mushroom

[ Analysis . Rice, locusts, and mushrooms are all multicellular organisms.

Keywords: Zhejiang Education Edition seventh grade science PPT courseware free download, structural hierarchy of living organisms PPT download, .PPT format;

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"Structural Hierarchy of Organisms" PPT:

"Structural Hierarchy of Organisms" PPT Part One Content: Learning Objectives 1. Master the process of cell division, growth and differentiation. 2. Understand the significance of cell division, growth and differentiation. ... ... ... Structural hierarchy of living organisms PPT, part 2 content:..

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Update Time: 2024-11-22

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 1 industry PPT template

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