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 16 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 seed's hard coat
A skeleton
Tiny tubes inside a stem
An owl's large eyes
A.Gather enough light to hunt at night
B.Protects the tiny plant inside until it sprouts
C.Holds the body up and lets it move
D.Carry water up to the leaves
2.Draw a line from each one to its match.
A duck's webbed feet
A fish's gills
A plant's roots
Lungs
A.Take in oxygen from the air
B.Anchor it in the soil and take in water
C.Take in oxygen from the water
D.Push against the water to swim
LessonPrint · 4-LS1-1 · Set 16 · free to copy for classroom use
Answer key — What the Structure Is For
Set 16. Prints on its own sheet.
1.1. A seed's hard coat — B (Protects the tiny plant inside until it sprouts) 2. A skeleton — C (Holds the body up and lets it move) 3. Tiny tubes inside a stem — D (Carry water up to the leaves) 4. An owl's large eyes — A (Gather enough light to hunt at night)
2.1. A duck's webbed feet — D (Push against the water to swim) 2. A fish's gills — C (Take in oxygen from the water) 3. A plant's roots — B (Anchor it in the soil and take in water) 4. Lungs — A (Take in oxygen from the air)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.