What the Structure Is For is a free printable Grade 4 science worksheet on how internal and external structures support survival, growth and reproduction, aligned to NGSS performance expectation 4-LS1-1. It prints 2 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.
Set 5 of 25 · the same problems every time you open this link.
Set 1 has all 25 in a single PDF. All 25 sets ask different questions.
What the Structure Is For
4-LS1-1
NameDate
Draw a line from each structure to what it does.
1.Draw a line from each one to its match.
A goat's split hooves
A skeleton
A rose's thorns
A cactus's thick waxy stem
A.Stores water and stops it drying out
B.Holds the body up and lets it move
C.Grip on steep rocky slopes
D.Stop animals eating the stem
2.Draw a line from each one to its match.
An owl's large eyes
A seed's hard coat
A duck's webbed feet
A heart
A.Push against the water to swim
B.Pumps blood around the body
C.Gather enough light to hunt at night
D.Protects the tiny plant inside until it sprouts
LessonPrint · 4-LS1-1 · Set 5 · free to copy for classroom use
Answer key — What the Structure Is For
Set 5. Prints on its own sheet.
1.1. A goat's split hooves — C (Grip on steep rocky slopes) 2. A skeleton — B (Holds the body up and lets it move) 3. A rose's thorns — D (Stop animals eating the stem) 4. A cactus's thick waxy stem — A (Stores water and stops it drying out)
2.1. An owl's large eyes — C (Gather enough light to hunt at night) 2. A seed's hard coat — D (Protects the tiny plant inside until it sprouts) 3. A duck's webbed feet — A (Push against the water to swim) 4. A heart — B (Pumps blood around the body)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.