Download 2.1 Organisms – Further questions and answers Q1. Bk Ch2 S2.1

2.1 Organisms – Further questions and answers
Q1.
Bk Ch2 S2.1 FQ1
Light and electron microscopes together provide a clear picture of the structure of living cells.
Summarise the limitations of the light microscope, compared with the electron microscope.
A1.
a
Bk Ch2 S2.1 FA1
The light microscope has a much smaller resolving power than the electron microscope. It has a resolution of up to
0.2 m compared with the electron microscope’s resolving power of 0.0002 m. Whereas the light microscope can
be used to view objects as small as individual cells in general detail and larger organelles such as the nucleus, the
electron microscope can resolve even the tiniest of organelles as well as view their internal structure.
Q2.
Bk Ch2 S2.1 FQ2
Suggest why there is no description of cells in the writing of biologists 400 years ago.
A2.
Bk Ch2 S2.1 FA2
The microscope was not invented until the 17th century. Until then there was no instrument available to magnify objects
as small as cells. Because cells are too small to be seen with the naked eye, biologists were not able to view or describe
them.
Q3.
Bk Ch2 S2.1 FQ3
Study the diagram of the following cell. Is it an animal cell or a plant cell? Give three reasons for your answer.
A3.
Bk Ch2 S2.1 FA3
Plant cell. The cell has a thick, rigid cell wall. Chloroplasts are evident within the cell. The cell has large vacuoles.
2.1 Cell theory FQA
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