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 10 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 rose's thorns
Lungs
A seed's hard coat
A skeleton
A.Holds the body up and lets it move
B.Stop animals eating the stem
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 goat's split hooves
A fish's gills
A cactus's thick waxy stem
A heart
A.Grip on steep rocky slopes
B.Take in oxygen from the water
C.Stores water and stops it drying out
D.Pumps blood around the body
LessonPrint · 4-LS1-1 · Set 10 · free to copy for classroom use
Answer key — What the Structure Is For
Set 10. Prints on its own sheet.
1.1. A rose's thorns — B (Stop animals eating the stem) 2. Lungs — C (Take in oxygen from the air) 3. A seed's hard coat — D (Protects the tiny plant inside until it sprouts) 4. A skeleton — A (Holds the body up and lets it move)
2.1. A goat's split hooves — A (Grip on steep rocky slopes) 2. A fish's gills — B (Take in oxygen from the water) 3. A cactus's thick waxy stem — C (Stores water and stops it drying out) 4. A heart — D (Pumps blood around the body)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.