2012 Waec Practical Expo Released

Here is the latest expo for the 2012 WAEC Practical. Please read well and don't rely fully on stuffs like this. We are only trying to help you and you should also help yourself. Remember that heaven helps those who help themselves.


Specimen A=> Garden egg fruit

Specimen B===> Tridax fruit

Specimen C===> Grain Weevil

Specimen D===> Tick

Specimen E===> Rat {wet preserved}

Specimen F===> Atlas vertebra of a
small mammal

Specimen G===> Axis vertebra of a
small mammal specimen

Specimen H===> Cervical vertebra of
a Small mammal

Specimen J===> Tilapia fish [web preserved]

Specimen K===> Toad

Specimen L===> Lizard
NOTE===> Specimen F,G & H are peculiar to Candidate in Ghana, Sierra-leone & the Gambia Only.

BIOLOGY PRACTICAL QUESTION



question 1. Classify Specimen A and B

question 2. State the agent of dispersal for Specimen A and B

question 3. Draw a label diagram of Specimen B.

question 4. Cut Specimen A into two longitudinal Section and label.

question 5. State two economic usefulness of Specimen E,D,C

question 6. State two way by which specimen C,D,E can be preserved

question 7. Name the habitat of Specimen J,K,L.

question 8. State two adaptive features of
Specimen J and L to live in their
respective habitat.

question 9. Mention two adaptive Features of Specimen K to live on land and in water.

BIOLOGY PRATICAL ANSWER 2012

ANS: Specimen A: garden egg: Features:

i) epicarp is soft and flesh

ii) many seeds are present

iii) epicarp is edible
iv) it is dispersed by ant.
ECONOMIC USEFULNESS:

i) used in Control of blindness

ii) good for ulcer patients

iii) helps to Control obesity. The type of placentation is axile. The botanical name is [solanum
melonge]

Specimen B: Tridax fruits: the botanical name is procumbenis and the family name is calyx. It is a true fruit. It develop from a Superior ovary and have one seed.

The mode of dispersion is by wind because it is small and light.

i) they act as Vector of diseases

ii) they cause great annoyance and irritation to host

iii) bites may become a source of secondary infection.
Control measures:

i) by picking

ii) by using insecticides

iii) burning the grass where a the graze. Different between weevil and tick: weevil Tick.

1) Antenna present-antenna
absent

2) rostrum present-rostrum absent

3) bristle absent present.
Similarities btw weevil and tick.

1) both have head-thorax and abdomen. Both have jointed legs.

Specimen J: tilapia fish-bony fish. Phylum-chlordata. Sub-phylum-vertebra. Class-pisces. Habitat-aquatic.

Adaptation of fish to its
environments.
  Streamlined body: this allows for easy movement in water.
Gills: offer an efficient means of
respiration in water.

Scales: they protect against injury, control movement of salt in and out of fish body

Specimen K:- toad. Phylum-
chordata. Class-amphibia. Habitat- live both on land and aquatic habitat. External features the body is divided into head and trunk.
Adaptation of the toad of life. On land: presence of hind limb for hopping. On water web on the hind limb for swimming over
streamlined shaped for easy movement Absence of neck to reduce friction during swimming.

Specimen L- agama Lizard, phylum-chorama-class-reptill. Habitat-terrestial. Adaptation of lizard to terrestrial habitat: limbs are develop for movement on land.