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 25 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 fish's gills
A bird's hollow bones
A heart
A plant's roots
A.Take in oxygen from the water
B.Pumps blood around the body
C.Keep it light enough to fly
D.Anchor it in the soil and take in water
2.Draw a line from each one to its match.
A flower's bright petals
A seed's hard coat
Lungs
A skeleton
A.Holds the body up and lets it move
B.Protects the tiny plant inside until it sprouts
C.Take in oxygen from the air
D.Attract insects that carry pollen
LessonPrint · 4-LS1-1 · Set 25 · free to copy for classroom use
Answer key — What the Structure Is For
Set 25. Prints on its own sheet.
1.1. A fish's gills — A (Take in oxygen from the water) 2. A bird's hollow bones — C (Keep it light enough to fly) 3. A heart — B (Pumps blood around the body) 4. A plant's roots — D (Anchor it in the soil and take in water)
2.1. A flower's bright petals — D (Attract insects that carry pollen) 2. A seed's hard coat — B (Protects the tiny plant inside until it sprouts) 3. Lungs — C (Take in oxygen from the air) 4. A skeleton — A (Holds the body up and lets it move)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.