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