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 24 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
An owl's large eyes
A.Take in oxygen from the water
B.Stop animals eating the stem
C.Gather enough light to hunt at night
D.Stores water and stops it drying out
2.Draw a line from each one to its match.
A flower's bright petals
Lungs
A plant's roots
A heart
A.Anchor it in the soil and take in water
B.Take in oxygen from the air
C.Pumps blood around the body
D.Attract insects that carry pollen
LessonPrint · 4-LS1-1 · Set 24 · free to copy for classroom use
Answer key — What the Structure Is For
Set 24. Prints on its own sheet.
1.1. A fish's gills — A (Take in oxygen from the water) 2. A rose's thorns — B (Stop animals eating the stem) 3. A cactus's thick waxy stem — D (Stores water and stops it drying out) 4. An owl's large eyes — C (Gather enough light to hunt at night)
2.1. A flower's bright petals — D (Attract insects that carry pollen) 2. Lungs — B (Take in oxygen from the air) 3. A plant's roots — A (Anchor it in the soil and take in water) 4. A heart — C (Pumps blood around the body)
Last reviewed 2026-09-05. Aligned to 4-LS1-1 of the Next Generation Science Standards.