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?

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

   Bo reads the dog's groups from largest to smallest. Which level of classification is step 5, Carnivora?

   • Order: a group inside a class, holding families
   • Family: a group inside an order, holding genera
   • Phylum: a group inside a kingdom, holding classes
   • Class: a group inside a phylum, holding orders

4. 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.

5. 3.

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

   • Haloarcula marismortui
   • the garden pea
   • Deinococcus radiodurans
   • the honey mushroom
6. 4.

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

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

7. A cell card (real facts)

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

8. 5.

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

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

9. Two domains compared (real facts)

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

10. 6.

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

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

11. A cell card (real facts)

    feature	what the cell has
    nucleus	no
    peptidoglycan in the wall	yes

12. 7.

    Pia reads a card for a cell. Which domain fits this cell?

    • Bacteria: no nucleus, and a wall with peptidoglycan
    • Animalia: a kingdom of animal cells
    • Eukarya: its DNA sits inside a nucleus
    • Archaea: no nucleus, so it fits Archaea as well

13. Parts of a scientific name (real facts)

    part	word
    first word	Canis
    second word	lupus

14. 8.

    Ren reads the scientific name of the wolf. Which word is 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
    • Canis lupus: both words together make the genus

15. Garden pea (real facts)

    part	word
    genus	Pisum
    species	sativum

16. 9.

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

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

17. Scientific names (real facts)

    organism	scientific name
    wolf	Canis lupus
    garden pea	Pisum sativum

18. 10.

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

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