The History of Cell Theory

The History of Cell Theory Worksheet (Grade 6 Science, TEKS 6.13A)

How did scientists discover that living things are made of cells? This one-page sheet tells the story on a five-card timeline: Robert Hooke names cells in cork (1665), Antonie van Leeuwenhoek sees living one-celled organisms (1674), Matthias Schleiden and Theodor Schwann conclude that plants and animals are made of cells (1838 and 1839), and Rudolf Virchow states that all cells come from pre-existing cells (1855).

What's Inside

• A Big Question box and a five-card illustrated timeline
• A short note on what a scientific theory is
• Activity 1: Students write the letter of the scientist who made each discovery
• Activity 2: Four fill-in-the-blank sentences with a word bank
• A visual answer key with answers marked in red

How Teachers Use It

Use it as practice or a quick check for TEKS 6.13A. 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 6.13A: describe the historical development of cell theory and explain how organisms are composed of one or more cells, which come from pre-existing cells and are the basic unit of structure and function. 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.