Bony fishes and the marsh frog’s external structure
Answers are for parents and teachers.
1
Compare a sturgeon and a carp (skeleton, scales, rarity).
Sturgeon: mostly cartilage skeleton, bony plates, some rare; carp: bone skeleton, scales, widespread.
2
Write 4 points on fish importance for people.
Meat and roe; fish oil; fishmeal (feed and fertiliser); sport and leisure.
3
Write 3 differences between frog and fish in external structure.
Frog: movable head, legs, eyelids; fish: fixed head, fins, no eyelids.
4
Why is it important that a frog’s skin stays moist?
It breathes through the skin; mucous glands keep it from drying.
5
Which structural adaptation matters for a frog’s jumping?
Long strong hind legs, pelvic girdle, strong muscles.