Read before you practise · 2 min
Read the Jawless Lamprey Life Cycle
Cyclostomes are jawless vertebrates; lampreys combine parasitism with a freshwater larval stage and migration.
NSEJS · Animal Kingdom · 1 linked question · 100% coverage
Know this first
Photosynthesis uses light energy to make food in green plant cells; transport tissues move water and sugar where they are needed.
Stomata · Leaf pores for gas exchangeXylem · Water-carrying tissuePhloem · Sugar-carrying tissue
Study deeper: NCERT Science · Animal Kingdom
See it
Track what enters, leaves and moves inside
CO₂ in
Leaf
O₂ out
H₂O rises from roots in xylem · sugar travels from the leaf in phloem
CO₂ enters through stomata; water arrives from roots; oxygen leaves the leaf. Sugar moves from the source leaf to use or storage sites.
Identify Petromyzon
Lampreys lack jaws and can attach as ectoparasites to fishes. Anadromous forms grow in the sea and migrate to freshwater to spawn; the ammocoete larva lives in freshwater.
OlympIQ exam lens
- ✓Petromyzon: jawless, often ectoparasitic.
- ✓Anadromous migration: sea to freshwater for spawning.
- ✓Ammocoete larva: freshwater.
OlympIQ trap
A jawless fish with an anadromous life cycle points to a lamprey, not a tunicate.
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