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 20 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 heart
A duck's webbed feet
A seed's hard coat
A fish's gills
A.Push against the water to swim
B.Protects the tiny plant inside until it sprouts
C.Take in oxygen from the water
D.Pumps blood around the body
2.Draw a line from each one to its match.
Tiny tubes inside a stem
A goat's split hooves
An owl's large eyes
A plant's roots
A.Anchor it in the soil and take in water
B.Gather enough light to hunt at night
C.Carry water up to the leaves
D.Grip on steep rocky slopes
LessonPrint · 4-LS1-1 · Set 20 · free to copy for classroom use
Answer key — What the Structure Is For
Set 20. Prints on its own sheet.
1.1. A heart — D (Pumps blood around the body) 2. A duck's webbed feet — A (Push against the water to swim) 3. A seed's hard coat — B (Protects the tiny plant inside until it sprouts) 4. A fish's gills — C (Take in oxygen from the water)
2.1. Tiny tubes inside a stem — C (Carry water up to the leaves) 2. A goat's split hooves — D (Grip on steep rocky slopes) 3. An owl's large eyes — B (Gather enough light to hunt at night) 4. A plant's roots — A (Anchor it in the soil and take in water)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.