WORKSHEET Prac 1: Microscopy, Cells & Organisms
Biology 1A
Worksheet Assessment
Prac 1: Microscopy, Cells and Organisms
Student names for prac pair
(as on MyLearning)
Student number
(“a number”)
Gurvansh Kairon
3194170
Mohammadullah mansoori
3216541
Demonstrator for this prac: Jarryd
Submit the worksheet on MyLearning (once per pair) before you leave the class!
Task 1.1 – Organism of your choice number 1 (10 marks – labels, scale bar, figure legend, micrograph)
A
Figure 1. A spider (Order Araneae) thorax and legs viewed under a compound microscope at a
magnification factor of 400x, investigating major external features. Setae are essential structures for
arachnids such as spiders, to allow for, adhesion and sensory perception. They serve as mechanoreceptors
for spiders, allowing them to detect mechanical signals and thus process them. These setae further divide
into smaller hair-like structures to allow for adhesion through Van der Waals interactions. The fangs of a
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WORKSHEET Prac 1: Microscopy, Cells & Organisms
Biology 1A
spider also play an essential role in their spider. Many spider species can produce venom. The fangs are
used in conjunction with venom, for self-defence and capturing prey.
Task 1.2. Organism of your choice number 2 (10 marks – labels, scale bar, legends, micrograph)
Figure 2. In the following figure above it shows a magnified fly. This fly was placed under a compound
microscope with magnifications of 0.67 and 10: making a total magnification of 6.7x. The fly is labelled as
shown, with scientific names for specific parts of its body. Furthermore, the flies’ wings are out of focus,
thus, cannot be analysed. Hence, why the focus is on the setae. The setae or seta of a fly are the tiny hair
bristles that cover most of their body. These tiny bristles are made of chitin and are connected directly to
the fly’s nervous system therefore acting as an advanced sensitive sensory receptor.
Task 1.3 – Organism of your choice number 3 (10 marks – labels, scale bar, legends, micrograph)
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WORKSHEET Prac 1: Microscopy, Cells & Organisms
Biology 1A
Figure 3. Presence of Eimeria tenella (Family Eimeriiddae), a single-celled parasite known to cause coccidiosis,
observed under a compound microscope with a magnification factor of 400x. Coccidiosis is the disease caused
to poultry by parasites such as Eimeria tenella. The parasite is host-specific, thus only infects young chickens,
who lack immunity, are in poor condition, or use feed and watering points contaminated with faeces. It is one
of the seven protozoan parasites that cause avian coccidiosis in poultry. Eimeria tenella is contracted through
faecal-oral route, where infected chickens excrete oocysts (single-celled, thick-walled structures) in faecal
matter.
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