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 19 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 seed's hard coat
A plant's roots
A heart
Lungs
A.Anchor it in the soil and take in water
B.Pumps blood around the body
C.Take in oxygen from the air
D.Protects the tiny plant inside until it sprouts
2.Draw a line from each one to its match.
A bird's hollow bones
A flower's bright petals
A rose's thorns
A duck's webbed feet
A.Keep it light enough to fly
B.Stop animals eating the stem
C.Push against the water to swim
D.Attract insects that carry pollen
LessonPrint · 4-LS1-1 · Set 19 · free to copy for classroom use
Answer key — What the Structure Is For
Set 19. Prints on its own sheet.
1.1. A seed's hard coat — D (Protects the tiny plant inside until it sprouts) 2. A plant's roots — A (Anchor it in the soil and take in water) 3. A heart — B (Pumps blood around the body) 4. Lungs — C (Take in oxygen from the air)
2.1. A bird's hollow bones — A (Keep it light enough to fly) 2. A flower's bright petals — D (Attract insects that carry pollen) 3. A rose's thorns — B (Stop animals eating the stem) 4. A duck's webbed feet — C (Push against the water to swim)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.