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 14 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 bird's hollow bones
A rose's thorns
A duck's webbed feet
A seed's hard coat
A.Push against the water to swim
B.Keep it light enough to fly
C.Stop animals eating the stem
D.Protects the tiny plant inside until it sprouts
2.Draw a line from each one to its match.
A flower's bright petals
An owl's large eyes
Lungs
Tiny tubes inside a stem
A.Carry water up to the leaves
B.Gather enough light to hunt at night
C.Take in oxygen from the air
D.Attract insects that carry pollen
LessonPrint · 4-LS1-1 · Set 14 · free to copy for classroom use
Answer key — What the Structure Is For
Set 14. Prints on its own sheet.
1.1. A bird's hollow bones — B (Keep it light enough to fly) 2. A rose's thorns — C (Stop animals eating the stem) 3. A duck's webbed feet — A (Push against the water to swim) 4. A seed's hard coat — D (Protects the tiny plant inside until it sprouts)
2.1. A flower's bright petals — D (Attract insects that carry pollen) 2. An owl's large eyes — B (Gather enough light to hunt at night) 3. Lungs — C (Take in oxygen from the air) 4. Tiny tubes inside a stem — A (Carry water up to the leaves)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.