What does turning a microscope’s focus knob do to a blurred specimen?
It makes the specimen look clearer.
Which scientist used a microscope to examine a thin slice of cork?
Robert Hooke.
Which scientist named the tiny room-like structures seen in cork cells?
Robert Hooke.
What are all organisms made up of?
Cells.
Which cell types are animal cells according to the section?
Red blood cells, nerve cells, sperm cells, and egg cells.
Which cell types are plant cells according to the section?
Root hair cells and leaf cells.
What does photosynthesis produce from sunlight?
Food.
What does respiration release from food?
Energy.
What is diffusion?
The movement of substances from higher to lower concentration.
What is the size order from smallest to largest among a mitochondrion, human sperm cell, human egg cell, and human embryo?
Mitochondrion, human sperm cell, human egg cell, human embryo.
How is total magnification calculated from eyepiece and objective lens magnifications?
What does the nucleus store?
The genetic material.
Where does respiration take place in an animal cell?
In the mitochondrion.
What substance is the site of chemical reactions in an animal cell?
The cytoplasm.
What does the animal cell membrane allow substances to do?
Move across it.
Where does a scientist look to observe a specimen through a microscope?
Through the eyepiece.
How many lenses magnify the specimen through a microscope’s objective lens?
Three lenses.
Where is a specimen placed for magnification under a microscope?
On the stage.
How does an amoeba reproduce?
By binary fission.
Which gas do animal cells usually take in?
Oxygen.
Which gas do animal cells usually let out?
Carbon dioxide.
What should a diffusion investigation measure, and how should its measurements be selected?
It should measure an independent and a dependent variable using suitable units and a sensible measurement range.
Where is the red gel cube placed in Theo’s diffusion setup?
At the centre of clear gel in a Petri dish.
What is the volume of the red gel cube in Theo’s diffusion setup?
1 cm³.
What is the diameter of the Petri dish in Theo’s diffusion setup?
10 cm.
Which sperm cell structure propels it toward an egg?
The tail.
How does a sperm cell's head help it perform its job?
Its streamlined shape helps it move efficiently.
Why does a sperm cell contain many mitochondria?
They provide energy for its movement.
What type of organism are amoebas?
Protists.
Answer 19 questions on Cells and Microscopy.
1. A microscope image of a specimen appears blurred. What should the observer do to make it clearer?
2. A student is setting up a microscope to magnify a leaf sample. Where should the student place the sample?
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