Iguanas

Iguanas, being cold-blooded reptiles, rely on the sun's heat to regulate their body temperature. They absorb thermal energy from the sun, which travels to Earth as infrared radiation. As iguanas warm up, they change color from purple to golden, a process visible through special cameras. This heat storage allows them to dive into cold water to feed on algae, where they lose heat through conduction and convection. Upon returning to land, they rewarm by lying on sun-drenched rocks, regaining enough heat to continue their activities.

Why do iguanas need to absorb heat from the sun?

• To change their body color

• To cool down in the ocean

• To stay alive as they are cold-blooded

• To produce their own thermal energy

What is the primary reason iguanas' bodies are black?

• To camouflage with the environment

• To absorb maximum heat from the sun

• To reflect sunlight

• To attract mates

How does the sun's thermal energy reach the Earth?

• Through infrared radiation

• Through visible light

• Through ultraviolet radiation

• Through sound waves

What color do iguanas turn when they warm up?

• Green

• Blue

• Red

• Golden

How do iguanas regain heat after losing it in the ocean?

• By staying in the water longer

• By eating more algae

• By lying on sun-drenched rocks

• By swimming faster