The unit in one line
One chapter — diagnostic features and classification from Protozoa to Chordata — carrying 4 of Zoology's 40 questions. That makes it the heaviest single chapter in Zoology.
Read in this order
- Non-chordate phyla (11 min) — Protozoa to Hemichordata: level of organisation, symmetry, germ layers, coelom, one diagnostic feature and named genera per phylum, and the "which phylum first showed it" table.
- Chordata and the vertebrate classes (9 min) — the chordate characters, the three subphyla, and the seven vertebrate classes compared on skin, heart, temperature and reproduction.
About 20 minutes in all. The one-screen phylum summary table is the revision card for the night before.
How it is asked
Recall is "which phylum has…" and "an example of…". Understanding is ordering features by when they first appeared, or explaining why Hemichordata is not a chordate. Application is identifying an animal from a described specimen: body cavity, symmetry, heart chambers, skin.
Then practise
The chapter test under Practice › Topics draws on questions written across every phylum and class. With four marks on one chapter, it is worth sitting twice.