Unicellular and Multicellular Organisms

Unicellular and Multicellular Organisms Worksheet (Grade 6 Science, TEKS 6.13B)

How do one-celled and many-celled organisms carry out the jobs of life? This one-page sheet compares unicellular organisms such as bacteria, amoebas, and yeast with multicellular organisms such as oak trees, mushrooms, and deer. It explains specialized cells and clears up the idea that unicellular always means "germ."

What's Inside

• A Big Question box and a doodle banner of unicellular and multicellular organisms
• A short reading on one cell doing it all and cells sharing the work
• Activity 1: Students write U or M for six organisms
• Activity 2: Students match four causes to their effects
• A visual answer key with answers marked in red

How Teachers Use It

Use it as practice or a quick check for TEKS 6.13B. The sheet takes about 10 minutes, needs no prior knowledge, and prints clearly in black and white.

This worksheet is part of the Reading in Science series for grade 6. It supports TEKS 6.13B: identify and compare the basic characteristics of organisms, including prokaryotic and eukaryotic, unicellular and multicellular, and autotrophic and heterotrophic. It is one of eleven connected TEKS 6.13 sheets: cell theory (6.13A), the basic characteristics of organisms (6.13B), and variation and survival (6.13C), plus a vocabulary review.

Why It Works

Each sheet opens with a Big Question, teaches the key terms in plain words with simple black-and-white doodles, and then asks students to use only what the page taught. Activities stay at the circle, sort, match, and fill-in level, so students can finish in about 10 minutes, and the visual answer key lets teachers check work fast.