2025 WAEC GCE SECOND SERIES (NOVEMBER) BIOLOGY: 2025 WAEC GCE Second Series BIOLOGY QUESTIONS AND ANSWERS (4877)

(1ai)
Metamorphosis is a series of gradual changes in forms and structures of an insect from egg stage to adult stage or imago.

(1aii)
In a tabular form:

Two types of Metamorphosis:
I. Complete netamorphosis

II. Incomplete metamorphosis

Three examples each of insects that undergo the type of Metamorphosis:

Complete metamorphosis:
(i) House fly
(ii) Mosquito
(iii) Butterfly

Incomplete metamorphosis:
(i) Cockroach
(ii) Grasshopper
(iii) Termite

(1aiii )
I. Complete metamorphosis is a form of metamorphosis that involves four different stages that is from egg - larva - pupa - adult.

II. Incomplete metamorphosis is a form of metamorphosis that involves two or three different stages, that is from egg - nymph - adult.

(1b)
(i) Maggot - Housefly.
(ii) Chrysalis- Aphid
(iii) Caterpillar - Butterfly
(iv) Nymph - Grasshopper

(2ai)
As the meal passes through the mouth. The meal remain unaffected because there is no chemical substances to act on them.

(2aii)
As it passes through the duodenum, the meal is been converted from fat to fatty acid.

(2b)
DIAGRAM [https://i.imgur.com/RwLILnl.jpg]

(2ci)
It is the wavelike movement of bolus (food substance) through the oesophagus down to the stomach.

(2cii)
(i) Tongue
(ii) Stomach
(iii) Small intestine

(3)

(5)