Question

8. Аскарида не может удлинять и укорачивать свое тело, так как: а)она паразитирует в кишечнике человека б)ее тело покрыто плотной кутикулой в)мышечные клетки аскариды расположены в один слой г)у нее отсутствует кожно-мускульный мешок 9. Объясните, какое значение для паразитических червей имеет развитие со сменой хозяев.​

Answer 1

Відповідь:

б

Пояснення:

ее тело покрыто плотной кутикулой

Answer 2

Can Ascaris Lengthen or Shorten Its Body?

Ascaris, a type of parasitic roundworm, cannot lengthen or shorten its body. There are several reasons for this:

a) Ascaris parasitizes the human intestine, and its body shape is adapted to this specific environment.

b) The body of Ascaris is covered with a dense cuticle, which provides protection and support. This cuticle does not allow for changes in body length.

c) The muscle cells of Ascaris are arranged in a single layer, which limits their ability to contract or expand the body.

d) Ascaris does not possess a body cavity called a coelom, which is found in some other organisms and allows for greater flexibility in body shape.

Therefore, due to these factors, Ascaris is unable to change the length of its body.

The Significance of Host Switching in Parasitic Worms

The development with host switching is significant for parasitic worms, including Ascaris. Host switching refers to the ability of a parasite to move between different host species during its life cycle.

The main reasons why host switching is important for parasitic worms are:

1. Access to Resources: Different host species provide different resources and environments for the parasite's survival and reproduction. By switching hosts, parasitic worms can exploit new resources and increase their chances of survival.

2. Avoiding Immune Responses: Host switching can help parasitic worms evade the immune responses of a particular host species. Each host species may have different immune defenses, and by switching hosts, the parasite can avoid being eliminated by the host's immune system.

3. Expanding Geographic Range: Host switching allows parasitic worms to expand their geographic range. By infecting different host species in different regions, the parasite can colonize new areas and increase its distribution.

4. Increasing Transmission Opportunities: Host switching can also increase the chances of parasite transmission. By infecting multiple host species, the parasite can increase the likelihood of encountering a suitable host and completing its life cycle.

Overall, host switching plays a crucial role in the survival, adaptation, and transmission of parasitic worms like Ascaris