【PEP】Grade 7 Biology (Upper): First Encounters with the "Eyes" of the Microscopic World

A microscope is not only a precision optical instrument, but also aleap in human cognitive dimensions. It serves as humanity's "eye" for exploring the microscopic world, allowing us to transcend the limits of the naked eye and confirm that living things possesscellular structural features that distinguish them from non-living matter.

Core Logic: From the Macroscale to the Microscale

Unity of Life: Through the microscope, we observe the high degree of order that living things exhibit at the microscopic level — a fundamental distinction between life and non-life.
Interdisciplinary Perspective: It serves more than just biology — in medical diagnostics, semiconductor analysis, and chemical molecular research, it is an indispensable scientific platform.
Environmental Adaptation: Organisms use intricate microscopic structures (such as the stomata on plant leaves) to adapt to and influence their environment. The microscope reveals these survival strategies.

💡 Summary

Advances in microscope manufacturing have directly deepened research in the life sciences. The microscope has become a vital bridge connecting fundamental theory with real-world practice, such as environmental monitoring and medical testing.

QUESTION 1

Based on the appearance of this microscope (designed by Robert Hooke), where do you think the specimen should be placed? Which parts magnify the specimen?

The specimen is placed at the top of the tube; the pillar provides magnification.

The specimen is placed on the stage (or specimen holder); the eyepiece and objective lens provide magnification.

The specimen is placed on the mirror; the base provides magnification.

QUESTION 2

Practice moving the observed image to the center of the field of view. First, move the glass slide to the left — which direction does the image move? Think about the relationship between the direction the image moves and the direction you move the slide.

The image moves to the left; the directions are the same.

The image moves to the right; the directions are opposite.

The image does not move; there is no direct relationship.

QUESTION 3

Robert Hooke discovered "cells" in the 17th century. What is the most significant meaning of this discovery?

It proved that living things evolved from non-living matter.

It confirmed that living things possess cellular structural features that distinguish them from non-living matter.

It led to the invention of the world's first electron microscope.

QUESTION 4

In environmental science research, scientists use microscopes to observe microorganisms in water. What is the main purpose?

To measure water depth and flow rate.

To assess the degree of water pollution and its impact on ecosystem adaptation.

To study the molecular weight of chemical elements in water.

QUESTION 5

Which of the following best illustrates the logic that "technology drives science"?

The evolution of microscope manufacturing technology determines the depth of our understanding of the boundaries of life.

Scientific research only requires logical reasoning, not observation tools.

As long as you have naked eyes, you can observe all structures of a cell.