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 6 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 cactus's thick waxy stem
A heart
A skeleton
Lungs
A.Pumps blood around the body
B.Holds the body up and lets it move
C.Stores water and stops it drying out
D.Take in oxygen from the air
2.Draw a line from each one to its match.
A seed's hard coat
A rose's thorns
Tiny tubes inside a stem
A duck's webbed feet
A.Carry water up to the leaves
B.Stop animals eating the stem
C.Protects the tiny plant inside until it sprouts
D.Push against the water to swim
LessonPrint · 4-LS1-1 · Set 6 · free to copy for classroom use
Answer key — What the Structure Is For
Set 6. Prints on its own sheet.
1.1. A cactus's thick waxy stem — C (Stores water and stops it drying out) 2. A heart — A (Pumps blood around the body) 3. A skeleton — B (Holds the body up and lets it move) 4. Lungs — D (Take in oxygen from the air)
2.1. A seed's hard coat — C (Protects the tiny plant inside until it sprouts) 2. A rose's thorns — B (Stop animals eating the stem) 3. Tiny tubes inside a stem — A (Carry water up to the leaves) 4. A duck's webbed feet — D (Push against the water to swim)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.