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 17 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.
Lungs
A bird's hollow bones
A goat's split hooves
A skeleton
A.Holds the body up and lets it move
B.Keep it light enough to fly
C.Grip on steep rocky slopes
D.Take in oxygen from the air
2.Draw a line from each one to its match.
A cactus's thick waxy stem
A plant's roots
A heart
A seed's hard coat
A.Protects the tiny plant inside until it sprouts
B.Pumps blood around the body
C.Stores water and stops it drying out
D.Anchor it in the soil and take in water
LessonPrint · 4-LS1-1 · Set 17 · free to copy for classroom use
Answer key — What the Structure Is For
Set 17. Prints on its own sheet.
1.1. Lungs — D (Take in oxygen from the air) 2. A bird's hollow bones — B (Keep it light enough to fly) 3. A goat's split hooves — C (Grip on steep rocky slopes) 4. A skeleton — A (Holds the body up and lets it move)
2.1. A cactus's thick waxy stem — C (Stores water and stops it drying out) 2. A plant's roots — D (Anchor it in the soil and take in water) 3. A heart — B (Pumps blood around the body) 4. A seed's hard coat — A (Protects the tiny plant inside until it sprouts)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.