"Single Cell Organisms" PPT

Description

"Single Cell Organisms" PPT

Part One: Situation Import

Euglena are single-cell organisms that often live in ditches, swamps or streams. When you put Euglena under a microscope, you can see the structure shown on the right.

It is difficult for human cells to survive without the human body. Euglena is a cell, so why can it live independently?

Think about it, discuss it

Euglena is a cell, why can it live independently?

Euglena is also a cell. It has the same basic structure as human cells - cytoplasm, nucleus, and cell membrane, but it also has different characteristics from human cells in structure and function.

Although Euglena has no organs and systems, its cells differentiate into different structures with different physiological functions and can independently complete various life activities. For example, flagella that can move can produce organic matter through photosynthesis through chloroplasts when there is light, and can obtain nutrients from the outside through the surface membrane when there is no light.

The existence of these structures helps Euglena live independently.

Single-celled organisms PPT, part 2: single-celled organisms

What is a single-celled organism?

Most of the animals and plants we see in our daily lives are composed of multiple cells. In fact, there are many organisms in the biosphere that are difficult to see with the naked eye. Their bodies have only one cell, called unicellular organisms. Most single-celled organisms live in water or moist environments, and some are parasitic on other organisms.

Structure and life of single-celled organisms

Ask students to study relevant content on their own and think about the following questions:

1. Understand the purpose, materials, tools, methods and steps of the "Observing Paramecium" experiment.

2. Try to complete the discussion.

3. Combine with the teaching material content to understand the structure and functions of each part of Paramecium.

summary:

Although the body of a paramecium is composed of only one cell, it has a delicate and complex structure to complete various physiological functions.

When the paramecium grows to a certain size, it will divide to produce new individuals.

Single-celled organisms PPT, part 3: Benefits of single-celled organisms

1. Many single-celled organisms such as Chlamydomonas, Euglena, and Paramecium are components of plankton and are natural food for fish.

2. Bacteria can decompose organic matter in sewage to purify sewage; paramecium can eat bacteria to prevent excessive growth of bacteria and achieve ecological balance.

Disadvantages of single-celled organisms

1. Some single-celled organisms can parasitize the human body and endanger human health.

2. Certain single-celled organisms in seawater can reproduce malignantly, causing red tides and harming fishery production and marine ecology.

Single-cell biology PPT, part 4: training to meet standards

1. Which of the following organisms is not composed of one cell ( )

A. Chlamydomonas B. Paramecium C. Amoeba D. Hydrilla

2. When observing Paramecium, in order to limit the movement speed of Paramecium, the culture medium on the slide should be placed ( )

A. Add gravy dropwise B. Put a small amount of cotton fiber

C. Add a small amount of salt D. Blot up the water

3. The way food enters the body of Paramecium for digestion and excretion is ( )

A. Oral groove, food vacuole, anus B. Cytoplasm, membrane, anus

C. Collection tube, telescopic bleb, epidermis D. Collection tube, telescopic bleb, anus

Single-cell biology PPT, Part 5: Consolidation exercises

1. Make a drop of Paramecium culture solution into a temporary mount for observation. Which of the following is the basis for confirming Paramecium? ( )

A. Contains chloroplasts with many vesicles inside

B. The shape of the body is not fixed and protrusions are always growing.

C. The body is oval and has a ring of flagella.

D. The body is like an inverted straw sandal, with cilia swinging and rotating forward.

2. The response of Paramecium to external stimuli is called ( )

A. Responsiveness B. Emission C. Reaction D. Adaptation

3. Among the following statements about single-celled organisms, which one is correct ( )

A. Single-celled organisms must live in water

B. Single-celled organisms do not have biological characteristics

C. Unicellular organisms are composed of only one cell

D. Single-celled organisms are all animals

4. When observing Paramecium with a microscope, from which part of the culture medium should the culture medium be drawn ( )

A. Upper middle layer B. Lower middle layer C. Surface layer D. Lower layer

5. Among the following single-celled organisms, which one has a certain effect in purifying sewage ( )

A. Plasmodium B. Euglena C. Amoeba D. Paramecium

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For more information about the "Composition of Living Organisms Single Cell Organisms" PPT courseware, please click the "Composition of Living Organisms ppt Single Cell Organisms ppt" tag.

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Update Time: 2024-07-04

This template belongs to biology courseware Jiangsu Education Edition Seventh Grade Biology Volume 1 industry PPT template

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