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 13 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 bird's hollow bones
A heart
A goat's split hooves
A fish's gills
A.Pumps blood around the body
B.Keep it light enough to fly
C.Grip on steep rocky slopes
D.Take in oxygen from the water
2.Draw a line from each one to its match.
An owl's large eyes
A skeleton
A plant's roots
A flower's bright petals
A.Anchor it in the soil and take in water
B.Attract insects that carry pollen
C.Holds the body up and lets it move
D.Gather enough light to hunt at night
LessonPrint · 4-LS1-1 · Set 13 · free to copy for classroom use
Answer key — What the Structure Is For
Set 13. Prints on its own sheet.
1.1. A bird's hollow bones — B (Keep it light enough to fly) 2. A heart — A (Pumps blood around the body) 3. A goat's split hooves — C (Grip on steep rocky slopes) 4. A fish's gills — D (Take in oxygen from the water)
2.1. An owl's large eyes — D (Gather enough light to hunt at night) 2. A skeleton — C (Holds the body up and lets it move) 3. A plant's roots — A (Anchor it in the soil and take in water) 4. A flower's bright petals — B (Attract insects that carry pollen)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.