Classification: domains, kingdoms and scientific names
Grade 9 Science Worksheet - Challenge Me
Circle the best answer.
“Tree (real groups, not to scale):” Bo reads a nested tree. How many of the eight levels do the dog and the honey mushroom share?
- Zero: the kingdoms differ, and kingdom is the top level
- Eight: both are in Eukarya, so they share each level
- One: the domain Eukarya, since the kingdoms differ
- Two: the domain and the kingdom, since fungi are close to animals
Read this first
Dog and wolf (real facts)
level dog wolf genus Canis Canis species lupus lupus extra subspecies name familiaris not used here Esme reads two names. The dog is a subspecies of the wolf. How many of the eight levels do the dog and the wolf share?
- Eight: domain through species
- Nine: the subspecies counts as a ninth level
- Six: domain through family
- Seven: domain through genus
Hippopotamus, pig and whale (real facts)
observation fact what a hippopotamus resembles more a pig, not a whale what DNA analysis suggests the hippopotamus may be the closest living relative of the whale Jun reads that a hippopotamus looks more like a pig than a whale. Why can DNA evidence still move it nearer the whale?
- A grouping is fixed once scientists name it, so a DNA result cannot change where the hippopotamus sits
- Looks can mislead, so DNA evidence can place a hippopotamus nearer the whale
- DNA copies body shape, so it matches how animals look in any grouping
- A hippopotamus has no DNA that scientists can compare
How prokaryotes were grouped (real facts)
period grouping until the 1970s all prokaryotes counted as bacteria later two domains, Archaea and Bacteria reason for the change large genetic differences Kira knows Archaea and Bacteria cells both lack a nucleus. Why are they now two separate domains?
- Archaea cells are far larger than Bacteria cells
- Their genes differ so much that DNA evidence supports two branches
- Both lack a nucleus, so Archaea are still a kind of Bacteria
- Archaea cells have a nucleus, which Bacteria cells lack
Horizontal gene transfer (real facts)
feature fact meaning genes pass between unrelated species common in Bacteria and Archaea in Eukarya rarer and less important Luz learns that genes can pass between distantly related species. What does this do to a simple branching tree?
- It merges Bacteria and Archaea into one species
- It changes nothing, since a tree already shows these links between branches
- It shows that Bacteria and Archaea are not prokaryotes
- It complicates the simple tree, so scientists test new models
Notebook
Notes on the three domains (classmate's notebook), 4 lines. Columns: line, entry. Line 1: Life is sorted into three domains: Bacteria, Archaea and Eukarya. Line 2: Bacteria and Archaea cells have no nucleus, so both are prokaryotes. Line 3: Archaea cells have a nucleus, which is why they are not Bacteria. Line 4: Eukarya cells have a nucleus, so animals, plants and fungi belong there.
Milo reads a classmate's notebook about the three domains. Which line has the mistake?
- Line 1: kingdoms, not domains, form the first split of the tree
- Line 2: Bacteria and Archaea are one domain, since neither has a nucleus
- Line 3: Archaea cells have no nucleus, and other differences set them apart
- Line 4: fungi have no nucleus, so they belong with Bacteria
Notebook
Notes on the wolf's name (classmate's notebook), 4 lines. Columns: line, entry. Line 1: The wolf's scientific name has two words, Canis lupus. Line 2: The first word, Canis, is the genus and starts with a capital letter. Line 3: The second word, lupus, names the wolf by itself, so Canis can be dropped. Line 4: Both words are written in italics.
Noah reads a classmate's notebook about the wolf's name. Which line has the mistake?
- Line 1: a scientific name needs three words
- Line 2: the genus Canis is not needed, since lupus alone names the wolf
- Line 4: scientific names are written in plain type, not italics
- Line 3: the species word needs its genus to make a scientific name
Notebook
Notes on a dog and a cat (classmate's notebook), 4 lines. Columns: line, entry. Line 1: The dog and the cat are both in class Mammalia. Line 2: They are also both in order Carnivora. Line 3: Sharing an order means they must share a genus too. Line 4: Counting from domain, they share five levels.
Pia reads a classmate's notebook about a dog and a cat. Which line has the mistake?
- Line 2: the cat is not in an order with the dog
- Line 1: the dog and the cat are in different classes
- Line 4: they share eight levels, not five, when counting from domain
- Line 3: sharing an order does not mean sharing a genus
DNA match for three model plant species (model data)
species match with group G (percent) match with group H (percent) species 1 96 62 species 2 94 60 species 3 63 95 Ren reads DNA results for three model plant species that were grouped together by flower shape. Which claim and reason fit best for species 3?
- Species 1 and 2 move to group H, since species 3 matches H well
- Species 3 stays in group G, since a grouping is fixed once it is named
- Species 3 may move to group H, since its DNA matches H more closely
- Species 3 stays in group G, since flower shape outranks DNA results
Names of the wolf and the dog (real facts)
animal scientific name wolf Canis lupus dog Canis lupus familiaris Zee reads two scientific names. Which claim and reason fit best for the wolf's scientific name?
- Canis lupus familiaris is the name, since the wolf is a subspecies of the dog
- Canis is the name, since the genus is the lowest level
- lupus is the name, since the species word names the wolf alone
- Canis lupus is the name, since it joins the genus and the species