Question

Как передвигается амёба? Какова строение амёба? Строение эвглены? Основной и промежуточный хозяин лигулы? Это по предмету Зоология.

Answer 1

How does an amoeba move?

Amoebas are single-celled organisms that move by using a process called amoeboid movement. This movement is achieved through the extension and retraction of their pseudopodia, which are temporary projections of the cell membrane and cytoplasm. By extending pseudopodia in the direction they want to move, amoebas can push themselves forward. Once the pseudopodia have anchored to a surface, the rest of the cell flows into them, allowing the amoeba to move forward. The process of extending and retracting pseudopodia allows amoebas to change direction and explore their environment.

What is the structure of an amoeba?

Amoebas have a simple cell structure. They consist of a single cell surrounded by a flexible cell membrane. Inside the cell, there is a nucleus that contains the genetic material of the amoeba. The cytoplasm fills the cell and contains various organelles responsible for carrying out essential cellular functions. Amoebas also have a contractile vacuole, which helps regulate water balance within the cell. Overall, the structure of an amoeba is relatively simple, allowing it to carry out basic life processes such as movement, feeding, and reproduction.

What is the structure of Euglena?

Euglena is a single-celled organism that belongs to the group of protists. It has a unique structure that allows it to carry out both plant-like and animal-like functions. The body of Euglena is elongated and has a whip-like tail called a flagellum at one end. The flagellum allows Euglena to move by propelling itself through water. At the front end of the cell, there is a light-sensitive spot called the eyespot, which helps Euglena detect light and move towards it. Euglena also contains a chloroplast, which enables it to carry out photosynthesis and produce its own food. This combination of animal-like and plant-like features makes Euglena a fascinating organism to study.

What are the main and intermediate hosts of Ligula?

Ligula is a genus of parasitic flatworms that infect fish. The life cycle of Ligula involves two hosts: a main host and an intermediate host. The main host of Ligula is typically a bird, such as a gull or a heron. The adult worms live in the intestines of these birds and produce eggs, which are then excreted into the water through bird feces. The eggs are ingested by small crustaceans, such as copepods, which serve as the intermediate host. Inside the copepod, the eggs hatch and develop into larvae. When the copepod is ingested by a fish, the larvae penetrate the fish's body and continue to develop. The fish serves as the intermediate host, providing a suitable environment for the larvae to grow. Once the larvae mature, they form cysts in the fish's body. When a bird consumes the infected fish, the cysts are released, and the life cycle of Ligula continues.

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