WAEC GCE Biology Practical past Questions and Answers

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WAEC GCE Biology Practical past Questions and Answers

WAEC GCE BIOLOGY PRACTICAL ANSWERS

(1a)
I – Placenta
II – Fallopian tube
III – Umbilical cord
IV – Amniotic fluid
V – Uterus wall
VI – Chorion
VII – Cervix
VIII – Foetus

(1b)
(i) II
(ii) VII
(iii) VII
(iv) II
(v) III

(1c)
(i) It helps in movement of part VIII which allows for proper bone growth
(ii) It helps to keep a constant temperature, protecting from heat loss.

(1d)
(i) Part III – Umbilical cord
(ii) Part IV – Amniotic fluid

(1ei)
(i) Human chorionic gonadotropin hormone (hCG)
(ii) Human placental lactogen (hPL)
(iii) Progesterone

(1eii)
(i) Human chorionic gonadotropin hormone (hCG) helps to support a growing embryo
(ii) Human placental lactogen (hPL) gives nutrition to the fetus
(iii) Progesterone stimulates the thickening of the uterine lining for implantation of a fertilized egg.

(1f)
(i) Barrier methods
(ii) Short-acting hormonal methods
(iii) Long-acting hormonal methods
(iv) Sterilization
(v) Spermicide
(vi) Fertility awareness methods.

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(2ai)
X – Leaf
Y – Stem
Z – Root

(2aii)
X – C
Y – B
Z – D

(2b)
(i) Xylem – B
(ii) Phloem – D

(2c)
(i) It transports water and nutrients from the plant to stems and leaves.
(ii) It translocates water and products of photosynthesis from source tissues.

(2d)
(i) Pith
(ii) It stores and transports nutrients throughout the plant.

(2ei)
Dicotyledonous

(2eii)
(i) Reticulate venation is present in the leaves.
(ii) Primary root radicle persists as Taproot.
(iii) Flowers tetramerous or pentamerous.

(2f)
X – It produces food for the plant by photosynthesis
Y – It conducts water and minerals to the leaves
Z – It absorbs water and nutrients from the soil.

(2g)
(i) Translocation
(ii) Transpiration

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(3ai)
Mosquito

(3aii)
A: Pupa
B: Eggs
C: Adult Mosquito
D: Larva

(3bi)
Complete metamorphosis

(3bii)
This is because it consists of four distinct stages that differ greatly in morphology.

(3ci)
I – Feathery hair
II – Respiratory trumpet
III – Egg raft
IV – Proboscis
V – Antenna
VI – Wing
VII – Hindleg
VIII – Siphon
IX – Lateral hair
X – Antenna

(3cii)
II – It is used for breathing
IV – It is used for piercing and sucking
V – It is used as movement receivers
VI – It is used for flight
VIII – It is used to breathe air at the water’s surface
X – It is used for sensing and gliding.

(3d)
B–>D–>A–>C
Eggs —> Larva —> Pupa —> Adult

(3e)
C:
(i) By the use of insecticides
(ii) By eliminating breeding areas.

D:
(i) By the use of larvicides
(i) By the removal of stagnant water

(3f)
(i) Possession of siphon for breathing
(ii) Possession of tracheal tube for breathing through the water surface.

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WAEC GCE BIOLOGY PRACTICAL QUESTIONS