"Single-celled Organisms" How cells constitute organisms PPT courseware 2

Description

"Single-celled Organisms" How cells constitute organisms PPT courseware 2

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?

learning target

1. Explain that single-celled organisms rely on one cell to complete life activities.

2. Give examples of the relationship between single-celled organisms and humans.

3. Use a microscope to observe Paramecium and further strengthen your microscope operating skills.

4. Agree with the idea that cells constitute living 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.

Experiment: Observing Paramecium

Experimental purpose: to observe the appearance and movement of Paramecium

Materials and tools: Paramecium culture medium, microscope, slide, cover slip, dropper, magnifying glass, a little cotton fiber

Method steps:

(1) Aspirate a drop of culture medium from _____ of the culture medium, place it on a glass slide, and observe with ____ and ________.

(2) In order to prevent the Paramecium from moving too fast during the experiment, a few threads of ___________ should be placed.

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.

Standard training

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

4. The picture on the right is the structure diagram of Paramecium. Answer according to the picture:

(1) The body shape of Paramecium is like an inverted straw sandal, with the "heel" end being the ______ end of the Paramecium.

(2) The movement of Paramecium mainly relies on the swing of ______.

(3) The structure of digested food is _______.

(4) Undigestible food residues will be excreted from the body through ______.

(5) The respiration of Paramecium is carried out through ______.

(6) [3] and [4] in the picture are ________.

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For more information about the PPT courseware "How Single-Celled Biological Cells Constitute Organisms", please click the "How Single-Celled Biological Cells Constitute Biological Organisms" ppt tag.

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Update Time: 2024-11-21

This template belongs to biology courseware People's Education Edition seventh grade biology volume 1 industry PPT template

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