(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
(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 type of... show full transcript
Worked Solution & Example Answer:(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
An organ is defined as a group of tissues that work together to perform a specific function within an organism. Examples include the heart, lungs, and leaves.
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 electron microscope is a more powerful type of microscope used to examine cellular structures in much greater detail.
Step 3
Name the plant that you used.
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Answer
I used a bean plant (Phaseolus vulgaris) for the microscopic analysis.
Step 4
How did you make a section of the stem and prepare it for examination?
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To prepare the transverse section of the stem, I used a scalpel to cut a thin section of the stem. The section was then immersed in water to prevent it from drying out, and a cover slip was placed over the section to prepare it for examination under the microscope.
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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Once the slide was placed on the stage of the microscope, I first turned on the light source and used the low power objective lens to locate the section. I looked through the eyepiece and carefully adjusted the focus using the coarse focus knob. Once the section was in view, I switched to a higher power objective lens to obtain a more detailed view, and finely adjusted the focus with 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.
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