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 8 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 duck's webbed feet
A skeleton
A fish's gills
Tiny tubes inside a stem
A.Take in oxygen from the water
B.Carry water up to the leaves
C.Holds the body up and lets it move
D.Push against the water to swim
2.Draw a line from each one to its match.
An owl's large eyes
A plant's roots
A bird's hollow bones
A cactus's thick waxy stem
A.Stores water and stops it drying out
B.Gather enough light to hunt at night
C.Keep it light enough to fly
D.Anchor it in the soil and take in water
LessonPrint · 4-LS1-1 · Set 8 · free to copy for classroom use
Answer key — What the Structure Is For
Set 8. Prints on its own sheet.
1.1. A duck's webbed feet — D (Push against the water to swim) 2. A skeleton — C (Holds the body up and lets it move) 3. A fish's gills — A (Take in oxygen from the water) 4. Tiny tubes inside a stem — B (Carry water up to the leaves)
2.1. An owl's large eyes — B (Gather enough light to hunt at night) 2. A plant's roots — D (Anchor it in the soil and take in water) 3. A bird's hollow bones — C (Keep it light enough to fly) 4. A cactus's thick waxy stem — A (Stores water and stops it drying out)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.