Question

A house lizard can climb a smooth wall due to the presence of
A. Suckers and mouth
B. Claws on digits
C. Adhesive lamellar pads on digits
D. Sticky Ventral side of the animal

Answer 1

Hint: The lizards have a magical ability to climb straight up to the walls and across the ceilings. The lizards use the vander waals forces to achieve such gravity-defying feats. The vander waals forces use intermolecular forces.

Complete answer:
The lizard has pads on their feet. These pads include wide plates or scales and are present below their fingers and toes. The outer layer of each plate or the scale is composed of numerous tiny hooks which are formed by free, bent tips of cells. These minute hooks create the conditions like a suction pump and hence, enable lizards to run up on apparently smooth walls and even upside down on plaster ceilings. Because these hook-like cells are bent downward and to the rear, the lizard curls its toes upward to disengage them. Thus while walking or running on horizontal or vertical walls, a lizard curls and uncurls its does thus creating a suction pressure that enables it to cling onto the walls. The house lizard can climb a smooth wall due to the presence of the vacuum pads that are present on the ventral side of the digits. They don't have the sticky ventral side.
Therefore, the correct answer is option C.

Additional information:
The lizards are a widespread group of squamate reptiles, with over six thousand species, ranging across all continents except Antarctica, as well as most oceanic island chains. The group is paraphyletic as it excludes the snakes and the Amphisbaenia; also some of the lizards are more closely related to these two excluded groups than they are to the other lizards. The lizards can range in size from chameleons and geckos a few centimetres long to the three-meter long Komodo dragon.

Note: Most of the lizards are harmless to human beings, as are most turtles; however, there are certain members of both the groups that can kill, maim, make ill, or inflict at least mild levels of the pain on their hapless human victims. Some of the lizards are venomous, and some are quite aggressive.