Question

Geckos and some other animals can climb smooth surfaces. Which of these explanations of this observation do you think is most reasonable?

The gecko’s feet are rough, which increases the friction with the surface.

The gecko’s feet have tiny suction cups on them that stick to the surface.

The gecko’s feet secrete a sticky substance that helps them adhere to the surface.

The gecko’s feet contain molecules that are attracted to the molecules on the surface.

Answer 1

Answer: The gecko’s feet contain molecules that are attracted to the molecules on the surface.

Geckos are lizards which belongs to reptile group. They are found in warm climatic regions of the world. Geckos and some other animals can climb smooth surfaces because of presence of Van der waal forces of attraction between the molecules of gecko's feet with molecules of the surface. The force of attraction is generated due to fluctuations or differences in charge present in molecules of feet and that of surface. The charge fluctuations generally comes into sync and generate attractive force.

Answer 2

D. The gecko’s feet contain molecules that are attracted to the molecules on the surface.