Classification: domains, kingdoms and scientific names

Grade 9 Science Worksheet - Building Confidence

Circle the best answer.

1. Read this first

   The dog's groups from largest to smallest (real facts)

   step	group of the dog
   1	Eukarya
   2	Animalia
   3	Chordata
   4	Mammalia
   5	Carnivora
   6	Canidae
   7	Canis
   8	lupus

2. 1.

   Ari reads the dog's groups from largest to smallest. Which level of classification is step 1, Eukarya?

   • Domain: the first and largest group
   • Kingdom: the first and largest group
   • Phylum: a group inside each kingdom
   • Class: a group inside each phylum
3. 2.

   Esme reads the dog's groups from largest to smallest. Which level of classification is step 7, Canis?

   • Genus: the first word of a scientific name
   • Family: a group that holds several genera
   • Species: the second word of a scientific name
   • Order: a group that holds several families
4. 3.

   “real groups, not to scale” Jun reads a tree of life. Split W is at its base and makes the three groups shown. Which level of classification are these groups?

   • Domains: the largest groups, made at the first split
   • Kingdoms: the largest groups, made at the first split
   • Classes: groups made inside each phylum
   • Phyla: groups made inside each kingdom

5. Tree of life (real groups, not to scale)

   The base of the tree makes three groups. Group Bacteria holds Escherichia coli and Deinococcus radiodurans. Group Archaea holds Haloarcula marismortui. Group Eukarya holds the honey mushroom and the garden pea.

6. 4.

   Kira reads a tree of life. Which organism sits in the same domain as Escherichia coli?

   • the honey mushroom
   • the garden pea
   • Haloarcula marismortui
   • Deinococcus radiodurans
7. 5.

   Luz reads a tree of life. How many domains does it show?

   • Three: Bacteria, Archaea and Eukarya
   • Two: Archaea are counted inside Bacteria
   • Five: one domain for each organism shown
   • Eight: one domain for each level of classification

8. A cell card (real facts)

   feature	what the cell has
   DNA location	inside a nucleus with a membrane around it

9. 6.

   Milo reads a cell card. Which domain holds an organism with this kind of cell?

   • Archaea: its cells have a nucleus too
   • Plantae: a kingdom whose cells have a nucleus
   • Bacteria: its cells have a nucleus too
   • Eukarya: its cells have a nucleus

10. Two domains compared (real facts)

    group	nucleus	peptidoglycan in the wall
    Bacteria	no	yes
    Archaea	no	no

11. 7.

    Noah compares two domains on a card. What do cells of Bacteria and Archaea share?

    • Both have walls that contain peptidoglycan
    • Both have a nucleus that holds their DNA
    • Both sit in one domain, since they share cell features
    • Both lack a nucleus, so both are prokaryotes

12. Parts of a scientific name (real facts)

    part	word
    first word	Canis
    second word	lupus

13. 8.

    Ren reads the scientific name of the wolf. Which word is the genus?

    • Canis lupus: both words together make the genus
    • lupus: the second word, which names the wolf by itself
    • Canis: the first word, written with a capital letter
    • Wolf: the common name is the genus

14. Garden pea (real facts)

    part	word
    genus	Pisum
    species	sativum

15. 9.

    Tala writes the scientific name of the garden pea. Which spelling follows the rules?

    • Pisum sativum: genus capitalized, species lowercase
    • Pisum Sativum: both words capitalized
    • pisum Sativum: species capitalized, genus lowercase
    • pisum sativum: both words lowercase

16. Scientific names (real facts)

    organism	scientific name
    wolf	Canis lupus
    garden pea	Pisum sativum

17. 10.

    Zee reads two scientific names. Which two levels make up a scientific name?

    • Species alone: one word, such as lupus
    • Domain and kingdom: two words, such as Eukarya Animalia
    • Genus and species: two words, written in italics
    • Family and genus: two words, such as Canidae Canis