9. (a) (i) In biology, what is meant by the term organ?
(ii) In school, a light microscope is normally used to examine cells and tissues - Leaving Cert Biology - Question 9 - 2010
Question 9
9. (a) (i) In biology, what is meant by the term organ?
(ii) In school, a light microscope is normally used to examine cells and tissues. Name a more powerful typ... show full transcript
Worked Solution & Example Answer:9. (a) (i) In biology, what is meant by the term organ?
(ii) In school, a light microscope is normally used to examine cells and tissues - Leaving Cert Biology - Question 9 - 2010
Step 1
In biology, what is meant by the term organ?
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Answer
In biology, an organ is defined as a collection of tissues that work together to perform a specific function. Different types of tissues form organs that contribute to the overall operation of the organism.
Step 2
Name a more powerful type of microscope that is used to show what cells are made of in much greater detail (cell ultrastructure).
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Answer
The type of microscope that is more powerful and used for viewing cell ultrastructure is an electron microscope.
Step 3
Name the plant that you used.
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Answer
The plant used in this experiment can be any named dicot plant, for example, a sunflower (Helianthus annuus).
Step 4
How did you make a section of the stem and prepare it for examination?
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Answer
To make a section of the stem, I used a scalpel or a backed blade to carefully cut the stem into thin slices. The sections were then prepared by placing them onto a slide, and I added a few drops of water. I also covered it with a cover slip to avoid contact with air.
Step 5
Describe how you examined your section of stem once you had placed the slide on the stage of the microscope.
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I started by ensuring the light source was on and used the low power objective first. I looked through the eyepiece and moved the slide until the section was in view. I then adjusted to a higher objective for more detail, using the coarse focus knob initially followed by the fine focus knob.
Step 6
Which of the following diagrams, A or B, best represents what was seen on your slide?
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Answer
Diagram B best represents what was seen on the slide, as it shows the characteristic structure of a dicotyledonous stem.
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