Class 11th – Protozoans – Sarcodina | Biological Classification | Tutorials Point

Summary

This tutorial video introduces Sarcodina, a group of protozoans also known as amoeboid protozoans. Characterized by their amoeba-like cells, they can be uni- or multi-nucleated and are commonly found in freshwater or marine environments. Sarcodina are endoparasites and pathogenic, relying on host organisms for nutrition. They move and capture food using pseudopodia or 'false feet.' They reproduce sexually through binary or multiple fission, and sometimes through syngamy, where two cells fuse to form a diploid zygote.

Takeaways

• 🐠 Sarcodina, also known as amoebae-like protozoans, are characterized by their amoeboid cells.
• 🌿 These protozoans can be either uni-nucleate or multi-nucleate.
• 💧 Sarcodina are commonly found in freshwater environments, and some species exist in marine environments.
• 🐛 They are endoparasites, relying on host organisms for nutrition and residing inside their bodies or cells.
• 🚫 Sarcodina are pathogenic, meaning they can cause harm to their host organisms.
• 🦶 The locomotory organ of Sarcodina is called pseudopodia, also known as false feet.
• 🍽️ Pseudopodia aid in both locomotion and capturing food by engulfing particles.
• 🌱 Sarcodina are heterotrophic, lacking photosynthetic pigments like chlorophyll, and thus cannot produce their own food.
• 🍖 They have a predatory feeding habit, similar to animals, consuming food whole.
• 🔗 The primary mode of reproduction for Sarcodina is sexual reproduction, which can occur through binary or multiple fission.
• 🤝 Sexual reproduction can also occur through the process of syngamy, where two cells fuse to form a diploid zygote.

Q & A

What is the second group of protozoans discussed in the video?

The second group of protozoans discussed in the video is called Sarcodina.

Why are Sarcodina also known as amoebae-like protozoans?

Sarcodina are also known as amoebae-like protozoans because they share characteristics with amoebae, including their amoeba-like cells.

What are the two types of nuclei that Sarcodina can have?

Sarcodina can be either uninucleate, meaning they have a single nucleus, or multinucleated, meaning they have multiple nuclei.

Where are Sarcodina commonly found?

Sarcodina are commonly found in freshwater environments, but some types can also be found in marine environments.

What does it mean for Sarcodina to be endoparasites?

Being endoparasites means that Sarcodina are dependent on host organisms for nutrition and reside inside the body or cells of these hosts.

How do Sarcodina move and capture food?

Sarcodina move and capture food using pseudopodia, also known as false feet, which are extensions of the cell's protoplasm.

Can you describe the process of how pseudopodia capture food?

Pseudopodia capture food by growing out and engulfing food particles, eventually bringing them inside the organism's body.

What type of nutrition do Sarcodina have?

Sarcodina have heterotrophic nutrition, meaning they cannot make their own food and must consume other organisms for sustenance.

What is the mode of reproduction for Sarcodina?

The mode of reproduction for Sarcodina is mostly sexual reproduction, which can occur through binary fission or multiple fission.

What is binary fission and how does it differ from multiple fission?

Binary fission is a type of asexual reproduction where a parent cell divides into two equal daughter cells. Multiple fission results in more than two cells being formed from a single parent cell.

Is there a sexual reproduction process mentioned for Sarcodina?

Yes, sexual reproduction can occur through the process of syngamy, where two cells fuse together to form a diploid zygote.