Robert Hooke and the First Observation of Cells

The question asks about the material Robert Hooke first observed under his magnifying device when he made the discovery of the cell.

Robert Hooke was a renowned English scientist in the 17th century. He used a microscope he built himself to observe various objects. One of his significant observations led to the discovery of the cell.

Material Observed by Robert Hooke

When Robert Hooke was studying different materials under his microscope, he prepared very thin slices of a specific material derived from a tree. This material was cork.

He observed the cork slices and saw a structure that reminded him of the small rooms or compartments found in a monastery. He called these tiny compartments "cells," a term derived from the Latin word "cellula," meaning a small room.

This observation of thin slices of cork in 1665 marked the first time cells were seen and described, leading to the coining of the term "cell" in biology.

Looking at the options provided:

• Pollen grains: While pollen grains were later observed by others, they were not the first material observed by Robert Hooke leading to the discovery of the cell.
• Leaf section: Plant tissues like leaves were observed by early microscopists, but cork was the specific material Hooke used for his famous observation.
• Flower parts: Similar to leaf sections, other plant parts were observed, but the initial observation of "cells" was made in cork.
• Thin slices of cork: This is the material that Robert Hooke observed, revealing the tiny compartments he named "cells."

Therefore, the material Robert Hooke first observed under his magnifying device during the discovery of cell was thin slices of cork.