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NOTICE  Waec 2018 EXPO - Biology Practical (POSTED)

#1
Hello Bloggerians,

How has your exams been so far? Great I suppose. Uhmmm! Humans! Humans! Humans!
Despite the emphasis I laid after the English Paper, you guys just decided to ignore my simple request. Well, it's alright. Such is life anyway..

Just keep refreshing, Biology Practical would be posted shortly. Make sure you invite your friends to this blog oh, so they don't miss out on the goodies.

Most of the answers are in picture format, that's why I delayed. Sorry.


Specimen A – Mosquito Larva
Specimen B – Maggot
Specimen C – Gill of a fish
Specimen D – Mammalian Lung
Specimen E – Dicotyledonous Leaf
Specimen F – Membranous wing of a cockroach.

Questions
1a. Identify specimen A and B
b. What is the habitat(s) of specimen A and B?
c. State four adaptive features each of specimens A and B
d. Name the respiratory structure in specimen A and B
e. At what stage of development is specimen A and B?
f. Into what stage will specimen A and B develop?
g. Name then organism from which specimen A and B developed
h. Name the type of food on which specimen A and B feed
i. How long does it takes for specimen A and B to develop into the next stage?
j. State the type of metamorphosis common to specimen A and B
k. Draw a well labelled diagram [10- 12cm long] of specimen A and B

Answers
1a. Specimen A is Culex Mosquito Larva
Specimen B is Maggot
b. Specimen A – stagnant water| water in a container| ponds| lakes| puddles| pools| still water.
Specimen B – decayed substances, especially proteinous foods rotten fruits| dead and decayed organic matter proteinous juice e.g. Meat or fish juice.

c. Features in specimen A
- Presence of siphon for breathing
- Presence of mouth brush for sweeping small organisms in water into the mouth.
- Presence of jointed body
- Presence of antenna (pair) for feeling
Features in specimen B
- Presence of spiracles for gaseous exchange
- Presence of jointed body
- Presence of anus for excreting wastes

- Presence of spines on body for protection
d. The respiratory structure in specimen A is the Hollowed breathing tube called Siphon
The respiratory structure in specimen B is the Spiracles and the moist Body Surface.

e. Larva stage of development (second stage)
f. Pupa stage of development (third stage)
g. Specimen A developed from Culex mosquito
Specimen B developed from Housefly
h. Specimen A feed on bacteria from the water
Specimen B feed on proteinous juice| decayed materials.
i. Specimen A takes 2-14 days to develop into the next stage
Specimen B takes 3-8 days to develop into the next stage
j. complete metamorphosis
k.

Questions
2a. Identify specimen C and D
b. give the function of each of specimen C and D
c. Give the general characteristics of specimen C and D
d. Give the organism(s) name(s) from which specimen C and D are obtained and name the habitat to which each belong.
e. Give any other two functions of specimen C and D apart from the general function.
f. Draw a well labelled diagram of specimen C and state the function of each of the labelled part.
g. Give the observable differences between specimen C and D

Answers
2a. specimen C is the gill of a fish Pisces
Specimen D is piece of mammalian lung Terrestrial mammals
b. the function of specimen C in the organism is for gaseous exchange and similar in function to specimen D
Specimen C is from aquatic while D from terrestrial habitats
c. characteristics of specimen C and D which adapt them to their functions.
I. They are highly vascularized or have a lot of blood vessels
II. They have thin surfaces
III. They are soft and moist
IV. They have irregular surfaces to create large surface area.
d. Specimen C is obtained from fishes – aquatic habitat

Specimen D is obtained from mammals – terrestrial habitat
e. Apart from gaseous exchange, specimen c performs the function
- sieving away particles in the water before passing it out through the operculum of fishes
- contains dissolve blood particles for circulation

Specimen D performs the function of
- receiving deoxygenated blood from the pulmonary artery
- helping in blood circulation
f.
g. Observable differences between specimen C and D

Specimen C Specimen D
Presence of gill arch Presence of trachea
Presence of filaments Presence of alveoli
Presence





Best Regards
Dr Mind
08064037783


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#2
(1ai)
A - Stagnant water (aquatic habitat)
B - Decomposing matter(terrestrial habitat)

(1aii)
A- Mosquito(Anopheles).
B- Housefly.

(1aiii)
A - Arthropoda (phylum)
Insecta (class)

B - Arthropoda (phylum)
Insecta (class)

(1b)
Specimen A
(i) It has bristles.
(ii) It has horny jaw.
(iii) It has siphon

Specimen B
(i) It has a hook.
(ii) It has mouth.
(iii) It has spiracles.

(1ci)
In a tabular form
Under A
(i) It has not got a hook
(ii) It has a bristle.
(iii) It has siphon
(iv) It has mouth brush.

Under B
(i) It has a hook
(ii) It doesn't have a bristle.
(iii) It does not have siphon.
(iv) It does not have mouth brush.

(1cii)
(i) They are both segmented organisms.
(ii) They both have mouth.
(iii) Both have thorax
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#3
If you are on whatsapp, just message me and get all the answers via image form.. I've been trying to upload it here.. It's not going fine...

Those who contacted me on whatsapp have all gotten the images...
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#4
(04-16-2018, 10:25 AM)drmind Wrote: If you are on whatsapp, just message me and get all the answers via image form.. I've been trying to upload it here.. It's not going fine...

Those who contacted me on whatsapp have all gotten the images...


Yes
08124398885
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#5
2a)
i)C- Tilapia fish
D- Rat
E- Mango plant
ii)Excretion
iii)
(a)Presence of gill filament which helps in gaseous exchange
(b)Presence of gill rakers which traps particles that might damage the delicate gill filament
©Gill arch which is bony and holds the gulls filament in shape

2b)
i)• Both have thin surface
ii)• Both are moist

2bii)
Tabulate
Under C
(a)Gill arch is present
(b)Gill filament is present
©Gill rackers is present

Under D
(a)Gill arch is absent
(b)Gill filament is absent
©Gill rackers is absent
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#6
(4ai)
Sepals,petals,carpels and stamen

(4aii)
(i) Sepals - 5
(ii) Petals - 5
(iii)Carpels - 1
(iv) Stamen - 10

(4b)
(i) Sex-monoecious
(ii) Presence of both carpels and stamen

(4c)
(i) Bilateral
(ii) It can be cut vertically into two similar halves through one plane

(4d)
K - Insect
L - Wind
 Reply
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#7
Message me on whatsapp - 08064037783

For the drawings..


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