Science Exam 4th Grade

Why do cactus have spines?

An adaptation that helps a cactus live in the desert is its:

• wide, flat leaves to catch water

• thin, spiny needles

• bright green color

• tall stems

Do you think cactus have deep roots to the underground?

• FALSE

• TRUE

Adaptations are:

• To produce

• without thinking or being aware

• a change in a living thing that helps it live in its environment.

Why do you think animals are attracted to cactus?

What is NOT an adaptation of a cactus?

• Spines to protect from animals

• A stem and leaves to store water

• Long and deep roots to get ANY water in the sol

How do dolphins breathe?

Dolphins need to allow the two halves of the brain to take turns while going to sleep.

• FALSE

• TRUE

Why some sharks pump water over their gills?

• To sleep

• To breathe

• To not use the brain

What did you understand or learn about the experiment?