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 9 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.
Tiny tubes inside a stem
A flower's bright petals
A skeleton
A heart
A.Carry water up to the leaves
B.Attract insects that carry pollen
C.Holds the body up and lets it move
D.Pumps blood around the body
2.Draw a line from each one to its match.
A bird's hollow bones
A duck's webbed feet
Lungs
A rose's thorns
A.Push against the water to swim
B.Stop animals eating the stem
C.Keep it light enough to fly
D.Take in oxygen from the air
LessonPrint · 4-LS1-1 · Set 9 · free to copy for classroom use
Answer key — What the Structure Is For
Set 9. Prints on its own sheet.
1.1. Tiny tubes inside a stem — A (Carry water up to the leaves) 2. A flower's bright petals — B (Attract insects that carry pollen) 3. A skeleton — C (Holds the body up and lets it move) 4. A heart — D (Pumps blood around the body)
2.1. A bird's hollow bones — C (Keep it light enough to fly) 2. A duck's webbed feet — A (Push against the water to swim) 3. Lungs — D (Take in oxygen from the air) 4. A rose's thorns — B (Stop animals eating the stem)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.