7th GRADE Passage 1: Our Circadian Clock pg. 242

The word "circadian" comes from the Latin word circa, which means "round-about," and the Latin word diem, which means "day." What does circadian mean in paragraph 1?

• once daily

• half a circle

• sphere-shaped

• twenty-four hour

The word "melatonin" comes from the Greek word melas, which means "black" or "dark." How does melatonin in paragraph 2 relate to this Greek root?

• It appears black under a microscope.

• It is produced when darkness approaches.

• It makes the center of the eyeball look black.

• It helps the eyes notice changes in light and darkness.

The origin of the word "visual" comes from the Latin word videre, meaning "to see." What does visual mean in paragraph 3?

• related to sight

• described in pictures

• connected to the senses

• expressed using only words

The origin of the word "disrupt" comes from the Latin word rumpere, meaning "break." What does disrupt mean in paragraph 4?

• establish a pattern

• remove a connection

• divide into smaller parts

• upset a process or action

The word "insomnia" comes from the Latin affix in-, which means "not," and the Latin root somnus, which means "sleep." What does insomnia mean in paragraph 4?

• poor-quality sleep

• difficulty waking up

• the inability to sleep

• a state of wakefulness