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Biology for Advanced Level Secondary Schools

ferns which are currently not existing (c) Given the wealth of information,
(extinct). knowledge, techniques, and skills
(c) It allows critical thinking and required to classify organisms, natural

development of inquiry minds. This classification is limited to taxonomic
experts.
is because description based on
FOR ONLINE READING ONLY
morphological, physiological, anatomical, Activity 2.1: Classification of living
and embryological features of a newly organisms

discovered species has to be made before
a decision on its proper placement to a Materials
taxon is reached. Earthworms, a Pinus branch, a fern
plant (Dryopteris sp. or Pteridium
(d) It is accurate, since it involves plenty aquilinum), a grasshopper, a butterfly,
of scientific research to gather enough a young maize plant, mature bean
information before the actual placement plant, a mouse, grass (Panicum sp. or
of an organism to a particular taxon is
done. Hyparrhenia sp.), a housefly, tilapia, a
hand lens, a note book, pen, and pencil

Demerits of natural system of Procedure
classification
(a) It makes classification of organisms (a) Collect the above mentioned
specimens.
tedious, expensive and time
consuming. It is very difficult, since (b) Observe each specimen carefully
it requires much information in order and use the hand lens provided, then
answer the questions that follow.
to place the organisms into their
respective groups.
Questions
(b) It is not stable, as it changes with the 1. Record any three observable
increasing diversity of organisms and features of each specimen.
new discoveries based on expanding
knowledge, science and technology. 2. Classify the specimens into two
It was the discovery of the light major groups, citing the criteria
microscope that led to the discovery used to classify them.
of kingdom Protista. Later, with 3. Using the features recorded in
the invention of the scan electron number 1 above, classify the
microscope, it made it easy to separate collected organisms into any three
Archaea and Eubacteria into different broad groups and state the criteria
groups within the same kingdom used to classify them.
Monera.

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