"Single-celled Organisms" How cells constitute organisms PPT courseware 7

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"Single-celled Organisms" How cells constitute organisms PPT courseware 7

We know that plants and animals are composed of many cells, so are all living things on the earth like this?

What characteristics do these creatures have in common? They are all composed of one cell

They are widely distributed in freshwater, seawater and moist soil environments. The individuals are tiny and difficult to see with the naked eye, but they can independently complete various life activities such as nutrition, respiration, and reproduction.

Paramecium

It is shaped like an inverted straw sole and is covered with cilia. It usually lives in ponds or ditches with rich organic matter and gentle water flow.

The main food is bacteria and single-cell algae, which has a certain purification effect on sewage

In the right environment, paramecium reproduces through cell division.

The structure and function of paramecium

Movement: Cilia (rotating forward in water)

Respiration: epidermis (absorbs oxygen, expels carbon dioxide)

Digestion: oral groove (food enters), food vesicle (food is digested) anus (food residue is discharged)

Excretion: collection tube (collects excess water and waste in the body) telescopic bubble (discharges excess water and waste from the body)

Reproduction: cell division and reproduction

Advantages of single-celled organisms:

1. Many single-celled organisms such as trumpet worms, sunworms, paramecium, and Euglena 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. Some bacteria can cause infectious diseases and harm human health.

3. Some single-celled organisms in seawater can reproduce viciously, causing red tides and harming fishery production and marine ecology.

How much do you know about single-celled organisms?

1. The body of a single-celled organism has only one cell.

2. They live in water and soil, and some are parasitic on the human body.

3. They have both beneficial and harmful aspects to humans.

Classwork

1. Judgment questions

1. Paramecium is shaped like an inverted straw sole with the tip being the front end of its body. ( )

2. All single-cell organisms do not contain chloroplasts and cannot carry out photosynthesis. ( )

3. Amoeba is a single-celled organism that can independently complete various life activities such as nutrition, respiration, and excretion. ( )

2. Fill in the blanks

1. Paramecium is a single-celled organism, and its structure from outside to inside is _____________, ______________, and _____________.

2. The main food of Paramecium is ______________. It reproduces through _______________ in a suitable environment.

3. Paramecium relies on the ____________ swings on its body surface to move forward in the water.

3. Multiple choice questions

1. The single-celled organism that can eat large amounts of bacteria and purify sewage is ( )

A. Amoeba B. Small melon worm C. Trumpet worm D. Paramecium

2. The structure of paramecium’s digested food is ( )

A. Mouth groove B. Cytoplasm C. Food bubble D. telescopic bubble

3. When making paramecium slices, put a little cotton fiber for ( )

A. Raise the cover glass so that the paramecia are less likely to die

B． Limit the movement of paramecium to facilitate observation

C. Limit the contrast of colors, allowing for comparative observation

D. Compared with Paramecium in size

4. The food residues that cannot be digested by Paramecium are excreted from the body through ( )

A. Collection tube B. Telescopic bubble C． Surface film D. anus

5. The way in which excess water is excreted from the body of Paramecium is ( )

A. Food soak B. Telescopic bubble C． Cell anus D. Kougou

6. Take the pond water containing Paramecium in a beaker. Soon you will find that the Paramecium are concentrated in the upper layer of the water. The reason is that Paramecium needs ( )

A. Sunshine B. Carbon dioxide C. Oxygen D. Nutrients

7. The process of Paramecium inhaling oxygen and expelling carbon dioxide is completed through the following structure ( )

A. Nucleus B. Cytoplasm C. Surface membrane D. Contractile vesicle

8. The channel through which food enters the body of Paramecium is ( )

A. Surface membrane B. Oral groove C. Oral cavity D. Cell anus

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Update Time: 2024-10-22

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

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