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 4 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 rose's thorns
A cactus's thick waxy stem
Lungs
A.Take in oxygen from the air
B.Stores water and stops it drying out
C.Take in oxygen from the water
D.Stop animals eating the stem
2.Draw a line from each one to its match.
An owl's large eyes
A duck's webbed feet
A goat's split hooves
A seed's hard coat
A.Gather enough light to hunt at night
B.Push against the water to swim
C.Protects the tiny plant inside until it sprouts
D.Grip on steep rocky slopes
LessonPrint · 4-LS1-1 · Set 4 · free to copy for classroom use
Answer key — What the Structure Is For
Set 4. Prints on its own sheet.
1.1. A fish's gills — C (Take in oxygen from the water) 2. A rose's thorns — D (Stop animals eating the stem) 3. A cactus's thick waxy stem — B (Stores water and stops it drying out) 4. Lungs — A (Take in oxygen from the air)
2.1. An owl's large eyes — A (Gather enough light to hunt at night) 2. A duck's webbed feet — B (Push against the water to swim) 3. A goat's split hooves — D (Grip on steep rocky slopes) 4. A seed's hard coat — C (Protects the tiny plant inside until it sprouts)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.