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 7 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 flower's bright petals
A fish's gills
A duck's webbed feet
A cactus's thick waxy stem
A.Attract insects that carry pollen
B.Stores water and stops it drying out
C.Push against the water to swim
D.Take in oxygen from the water
2.Draw a line from each one to its match.
A plant's roots
Tiny tubes inside a stem
An owl's large eyes
A bird's hollow bones
A.Carry water up to the leaves
B.Keep it light enough to fly
C.Anchor it in the soil and take in water
D.Gather enough light to hunt at night
LessonPrint · 4-LS1-1 · Set 7 · free to copy for classroom use
Answer key — What the Structure Is For
Set 7. Prints on its own sheet.
1.1. A flower's bright petals — A (Attract insects that carry pollen) 2. A fish's gills — D (Take in oxygen from the water) 3. A duck's webbed feet — C (Push against the water to swim) 4. A cactus's thick waxy stem — B (Stores water and stops it drying out)
2.1. A plant's roots — C (Anchor it in the soil and take in water) 2. Tiny tubes inside a stem — A (Carry water up to the leaves) 3. An owl's large eyes — D (Gather enough light to hunt at night) 4. A bird's hollow bones — B (Keep it light enough to fly)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.