Welcome to your GRADE 7 GENERAL SCIENCE CHAPTER 4
After carefully reading the following 30 questions, choose the correct answer.
1.
What are the two main types of microscopes mentioned in the text?
2.
Which part of the microscope is the lens at the top that you look through?
3.
What is the term for the ability of a microscope to show two close objects as separate?
4.
Who was the first person to use the term "cell" after observing cork?
5.
Which scientist discovered the nucleus in 1831?
6.
Which organelle is known as the "powerhouse" of the cell?
7.
What is the thin, flexible outer layer that controls what enters and leaves the cell?
8.
Which organelle is responsible for protein synthesis?
9.
What structure is present in plant cells but absent in animal cells?
10.
Which organelle contains chlorophyll and is used for photosynthesis?
11.
What is the jelly-like substance where most chemical reactions occur in the cell?
12.
Which part of the cell controls all cell activities and contains genetic material?
13.
Which microscope part is used to bring the specimen into sharp focus after rough focusing?
14.
What is a single-celled organism called?
15.
Which organelle is responsible for packaging and distributing proteins?
16.
What are organisms made of many cells called?
17.
Which part of the microscope holds the slide in place?
18.
What did Rudolf Virchow state in 1855?
19.
What is the total magnification if the eyepiece is 10x and the objective is 40x?
20.
Which organelle contains enzymes that digest waste materials?
21.
What is the structural and functional unit of all living things?
22.
Which organelle is very large in plant cells and provides structural support?
23.
What is the primary component of the plant cell wall?
24.
Which microscope part rotates to change the objective lenses?
25.
Which organelle is present in animal cells but usually absent in plant cells?
26.
What is the basic function of the cell's plasma membrane?
27.
Which of these is an example of a unicellular organism?
28.
Which part of the microscope controls the amount of light reaching the specimen?
29.
What structure separates the nucleus from the cytoplasm?
30.
What is the name of the microscope part you hold when carrying it?
