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 12 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 skeleton
Lungs
A heart
A.Holds the body up and lets it move
B.Pumps blood around the body
C.Take in oxygen from the air
D.Keep it light enough to fly
2.Draw a line from each one to its match.
A duck's webbed feet
Tiny tubes inside a stem
A goat's split hooves
A rose's thorns
A.Grip on steep rocky slopes
B.Carry water up to the leaves
C.Push against the water to swim
D.Stop animals eating the stem
LessonPrint · 4-LS1-1 · Set 12 · free to copy for classroom use
Answer key — What the Structure Is For
Set 12. Prints on its own sheet.
1.1. A bird's hollow bones — D (Keep it light enough to fly) 2. A skeleton — A (Holds the body up and lets it move) 3. Lungs — C (Take in oxygen from the air) 4. A heart — B (Pumps blood around the body)
2.1. A duck's webbed feet — C (Push against the water to swim) 2. Tiny tubes inside a stem — B (Carry water up to the leaves) 3. A goat's split hooves — A (Grip on steep rocky slopes) 4. A rose's thorns — D (Stop animals eating the stem)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.