Observing Cells Quiz

What are all living things made of?

• Tissues

• Cells

• Organs

• Systems

Answer explanation

All living things are made of cells, which are the basic units of life. Tissues, organs, and systems are made up of cells, but the fundamental building block is the cell itself.

Who first used a microscope to look at cork cells about 350 years ago?

• Isaac Newton

• Robert Hooke

• Charles Darwin

• Albert Einstein

Answer explanation

Robert Hooke was the first to use a microscope to examine cork cells in 1665, coining the term 'cell' for the small compartments he observed. This groundbreaking work laid the foundation for cell biology.

Which instrument do scientists use to look at very small objects in detail?

• Telescope

• Microscope

• Binoculars

• Magnifying glass

Answer explanation

Scientists use a microscope to examine very small objects in detail, as it provides high magnification and clarity. In contrast, telescopes are for distant objects, binoculars for viewing at a distance, and magnifying glasses offer limited magnification.

What is the smallest unit of life?

• Atom

• Tissue

• Cell

• Organ

Answer explanation

The smallest unit of life is the cell. Cells are the basic building blocks of all living organisms, capable of performing life processes, unlike atoms, tissues, or organs, which are larger structures made up of cells.

What does 'making an observation' mean in science?

• Guessing what will happen

• Looking carefully and in detail at an object

• Writing down results only

• Using only your eyes

Answer explanation

In science, 'making an observation' means looking carefully and in detail at an object. This process involves gathering information through careful examination, rather than just guessing or using limited senses.

Why are thin slices used when observing objects under a microscope?

• To make them look bigger

• To allow light to pass through

• To make them easier to hold

• To see more colours

Answer explanation

Thin slices are used under a microscope to allow light to pass through the specimen. This transparency is essential for clear observation and detailed examination of the object's structure.

What is the total magnification if the eyepiece lens is ×10 and the objective lens is ×40?

• 400

• 50

• 140

• 4

Answer explanation

Total magnification is calculated by multiplying the eyepiece magnification by the objective magnification. Here, 10 (eyepiece) × 40 (objective) = 400. Therefore, the correct answer is 400.

Which part of the microscope holds the slide?

• Stage

• Lens

• Light

• Eyepiece

Answer explanation

The stage of the microscope is the flat platform where slides are placed for observation. It supports the slide and allows for easy manipulation and focusing, making it the correct answer.

Which part of the microscope do you look through?

• Stage

• Eyepiece

• Objective lens

• Coarse focus

Answer explanation

The eyepiece is the part of the microscope you look through to see the magnified image of the specimen. The stage holds the slide, the objective lens magnifies the image, and the coarse focus adjusts the focus.

What does the fine focus knob do on a microscope?

• Adjusts light

• Brings the object into clear detail

• Moves the slide

• Changes magnification

Answer explanation

The fine focus knob on a microscope is used to bring the object into clear detail by making small adjustments to the focus, allowing for a sharper image. This is essential for observing fine structures.