Biological Classification: common misconceptions

If your child says… “Once we name a group, it cannot change.”

Ask together

Which grouping uses the new information about cells and feeding?

What’s true

New evidence can change where an organism belongs.

If your child says… “All bacteria cause disease.”

Ask together

How does making curd fit your claim about all bacteria?

What’s true

Many bacteria are useful, and only some cause disease.

If your child says… “Diatom deposits are piles of living cell contents.”

Ask together

Which part is hard enough to remain after the soft contents decay?

What’s true

Diatomaceous earth comes from lasting silica walls after the cells die.

If your child says… “Cell contents and nuclei always fuse together.”

Ask together

If nuclei remain separate after cell contents join, has nuclear fusion happened?

What’s true

Plasmogamy joins cell contents, while karyogamy joins nuclei.

If your child says… “The generations mean summer and winter forms.”

Ask together

Does changing the season itself join gametes or halve chromosome sets?

What’s true

Gametophytes produce gametes and sporophytes produce spores, regardless of the season.

If your child says… “Viruses can multiply by themselves.”

Ask together

Where does the diagram show new particles being assembled?

What’s true

Viruses depend on a living host cell's machinery for reproduction.