2021 WAEC Biology Practical Specimen And Answer

2021 WAEC Biology Practical Specimens And Answer

Specimen A: Cervical Vertebra Mammal

Location of Specimen A

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These are endoskeleton that is found in the neck region of mammals in man, they are seven in number. The first cervical vertebra is called the atlas while the second is called the axis, the third to seven bones are the normal cervical bones.

Characteristics of Atlas Specimen A C1

• It has a flat and broad transverse process
• The neural Spine is very short or Absent.
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• The centrum is Absent
• It has a vertebraterial canal for the passage of blood vessels

Characteristics of Atlas Specimen A C2

• It has a broad and flat centrum
• It has a vertebraterial canal
• It articles with the atlas through the odontoid process

Characteristics of Normal Specimen A C7

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• The C7 may process cervical ribs
• C7 formen may transmit the posterior vertebral Vein ( if doubled)

Functions Of the Axis

• It allows the head turned easily, I.e twisting of the head
• It has a pair of the short transverse process
• There is a large neural canal and neural arch
• A large cylindrical centrum is present

Function of Atlas

• It permits the nodding of the head

 

 

Specimen B: Thoracic Vertebra Mammal

Location: The thoracic vertebra is found in the chest region in man, they are twelve in numbers.

Characteristics of Specimen B

• The specimen B has a long and prominent neural spine when projects upward and backward
• It has a pair of the short transverse process
• There is a Waec Biology practical specimen Answer 2021large neural canal and neural arch

The function of Specimen B

• It aids the attachment of the ribs
• Muscles of the specimen are back and are attached to the neural spring
• It assists in breathing alongside the ribs

 

 

Structure of Specimen B

They are larger than the cervical but smaller than the lumbar vertebra in size, which is Heart Shaped.

Specimen C: Lumber Vertebra Mammal

Location: Specimen C are found in the upper abdominal Region

Characteristics of Specimen C

• It has a large, flattened transverse process
• It has a broad and flat neural spine
• It has a large and thick centrum
• It has well-developed pie and post-Zygapopheses

Functions of the Specimen C

• The lumber Vetebra Provides attachment for abdominal muscles
• They bear the considerable weight of the body

 

The shape of Specimen C

They are very large vertebra bodies that have kidney-shaped

Similarities between Specimen A, B, and C

• The presence of Neural canal
• The presence of the Neural spine
• Present of Facet

Differences between Specimen A, B, and C

Specimen A	Specimen B		Specimen C
Absent of Centrum	Present of centrum		Present of Centrum
The Neural Spine is Absent		The present of Neural Spine		The present of neural Spine
It has a flat and broad transverse		It has a pair of the short transverse process		It has a large flattened transverse process

 

Specimen L: Adult Mosquito ( freshly obtained)

Phylum: Specimen L is Arthropod

Class:     Specimen L is Insecta

Habitat of Specimen L

Specimen lives in unkept, dirty overgrown bushes and stagnant water (pour some water in a container with a wide mouth. Leave it outside a house around which some bushes are growing. After some days, you are likely to see a freshly adult mosquito

Sex of Specimen L

Female Mosquito

Life History of Specimen L

Specimen L exhibits complete metamorphosis, I.e the fertilized eggs develop to lava, then larva to pupa, and finally to adult or imago.

The female mosquito lays about 2-7 batches of eggs, each batch consisting of about 100 eggs at a time which is lay inside a container holding water.

The entire life cycle from an egg to an adult takes approximately 8 – 10days. Pupae develop into flying mosquitoes in 2 – 3 days

What kind of metamorphosis does Specimen L undergo

It undergoes a complete metamorphosis which is egg – larvae – pupa – Adult

Mode of Feeding of Specimen L

The mosquito has a unique mouthpart modified for piercing and sucking blood.

Economics Importance of Specimen L

• They serve as food for many species
• They transfer diseases
• They feed on blood
• They cause disaster to humans ( death)

Observable Features of Specimen L

• The presence of Abdomen/Abdominal segment; for digestion, excretion, and reproduction
• The presence of antenna; For sensitivity
• Present of wing/feathering hair; for a defense to flight
• Present of eye; for vision/sight/seeing
• Present of maxillary palp; use to taste the quality of the food

 

Diagram of mosquito (side view)

Ways to control Specimen L

• Stagnant water should not be allowed to exist near the dwelling place
• Insecticides should be sprayed on any stagnant water either the eggs, larvae, and pulpae
• Bushes around houses, schools, churches, hospitals, should be cleared
• It is advisable to sleep under a mosquito net in other to avoid adult mosquito bites

Specimen M ( Butterfly)

Habitat of Specimen M: They lives in quiet forest and pasture

Phylum: Specimen M is Arthropod

Class: Specimen M is Insecta

Life History of Specimen M

Specimen M exhibits, complete metamorphosis ad they undergo four stages of metamorphosis which are egg – larvae – pupa – Adult

Mode of Feeding of Specimen M

The specimen has a unique mouthpart modified which is used in sucking the nectar of flowers.

Economic Importance of Specimen M

• They serve as food to some species mostly in the food chain
• They play important role in pollinating flowers ( pollination of flowers)
• They feed on flowers by sucking the nectar of flowers

Observable Features of Specimen M

• The presence of Abdomen/Abdominal segment; for digestion, excretion, and reproduction
• The presence of antenna; For sensitivity
• Present of wing/feathering hair; for camouflage
• Present of eye; for vision/sight/seeing
• Present of maxillary siphoning: For sucking/feeding
• The presence of legs; for locomotion

 

Physical / Behavioural Adaptation of Specimen M ( Butterfly)

• The strew like tongue also called the proboscis help them to survive
• The monarch’s ways color tells predators they are poisonous to eat
• Their behavioral Adaption include their ability to migrate from cold winter (the ability of metamorphosis)
• As caterpillars (lava), they eat milkweed which contains poison. The adaptation makes them taste terrible to most predators

Specimen N:  ( Sugar Ant)

Habitat of Specimen N

Specimen N lives in a cupboard, kitchen, uncovered food, homes.

Phylum: Specimen N is Arthropod

Class: Specimen N is Insecta

Life History of Specimen N

Specimen M exhibits, complete metamorphosis ad they undergo four stages of metamorphosis which are egg – larvae – pupa – Adult

Mode of Feeding of Specimen N

The specimen N ( Sugar Ant feed by chewing and scrapping)

Economic Importance of Specimen N (sugar Ant)

• It helps to keep the environment clean
• They act as decomposers by feeding on organic waste like sugar, insect, and dead animals
• They are destructive
• Specimen N act as a predator to other insect and their eggs
• They serve as a source of food for some invertebrate and vertebrate

How to control Specimen N

• Keeping the kitchen clean
• Emptying your trash regularly and eliminating moisture whenever possible
• Keeping food well sealed in proper storage containers.

Diagram of Specimen N (Dorsal view)

Similarities between specimen L M and N

• They have the same division (  such as head, thorax, and abdomen)
• They all have the same complete metamorphosis stages ( they have the same life cycle)

Difference between Specimen L, M, and N

Specimen L Mosquito	Specimen M Butterfly	Specimen N Sugar Ant
Mosquito feed on blood	Butterfly feed on by collecting nectar	Sugar Ant feed on sugar or fruit
Mosquito feed by piercing and sucking	Butterfly feed by sucking only	Sugar Ant feed by chewing and scrapping
Mosquito lay an egg on water	Butterfly lay eggs on plants
They protect themselves by quick fly	They protect themselves through camouflage by folding their wings	They protect themselves by the attack and defend by bitting

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