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Waec Expo 2024 Biology Practical Answers

[5/24, 9:11 AM] Solution:

1.
a.
Phylum: Chordata
Class: Aves

b.
Three observable features of specimen B (whole liver from domestic fowl) could include:

  1. Dark red color
  2. Smooth texture
  3. Irregular shape

c.
(i) Functions of specimen B (whole liver from domestic fowl) to the organism:

  1. Metabolism: The liver plays a crucial role in metabolizing nutrients and detoxifying harmful substances.
  2. Storage: The liver stores essential nutrients such as vitamins and minerals.
  3. Regulation: The liver helps regulate blood sugar levels and cholesterol levels.

(ii) Functions of specimens D (whole gizzard from domestic fowl) and E (whole intestine from domestic fowl) to the organism:
D. Grinding: The gizzard helps grind food particles before digestion.
E. Absorption: The intestine absorbs nutrients from digested food.

(iii) Adaptations of specimens D and E to the functions stated in 1(c)(ii):
D. Tough lining: The gizzard has a tough lining made of keratin to aid in grinding food effectively.
E. Villi: The intestine has finger-like projections called villi to increase surface area for better nutrient absorption.
[5/24, 9:21 AM] Solution: -BIOLOGY SPECIMENS-

A] Gill of Fish { Freshly Produced }
B] Whole Liver of a Domestic Fowl with gall bladder attached in a Petridish {Fresh Produce }
C] Lungs from a Domestic Fowl on a White Tile [ Freshly Produced ]
D] Whole Gizzard from a Domestic Fowl Spreed in a Tray { Freshly Produced }
E] Whole Intestine from a Domestic Fowl Spreed in a Tray [ Freshly Produced }
F} Ginger Rhizome { Fresh }
G] Onion Bulb
H] Leaf of Bryophyllum { With Adventurous Root }
J] Cassava Stem
K] Cassava Rubber
L] Thoracic Vertebra
M] Humerus Bone
N] Mango Seed { Dry }
P] Femur Bone
Q] Lumbar Vertebra
R] Orange Seed [ Dry ]


[5/24, 9:36 AM] Solution: WAEC BIOLOGY PRACTICAL

(1a)
Phylum: Chordata
Class: Aves

(1b)
(i)Dark red color
(ii)Smooth texture
(iii)Irregular shape

(1c)
(i)metabolizing nutrients and detoxifying harmful substances.
(ii)stores essential nutrients such as vitamins and minerals.
(iii)regulate blood sugar levels and cholesterol levels.

(1cii)
Spec D. Grinding: The gizzard helps grind food particles before digestion.
Spec E. Absorption: The intestine absorbs nutrients from digested food.

(1ciii)
Spec D; possession of grit
Spec E; possession of large surface area

(1d)
TABULATE
Under observation
(i)red litmus turn blue
(ii)No effect on blue litmus

-Under inference-
(i) Alkaline
(ii)Not acidic

[5/24, 9:50 AM] Solution: (2a)
(i)for propagation
(ii)serve as storage organ
(iii)For photosynthesis
(iv)For gaseous exchange

(2bi)
Spec F; for propagation
Spec K; serve as storage organ

(2bii)
Spec F; it is reproductive in nature
Spec K; due to the nature of it surface

(2biii)
Spec F; root
Spec K; stem

More coming
[5/24, 9:50 AM] Solution: (1a)
Phylum: Chordata
Class: Aves

(1b)
(i)Dark red color
(ii)Smooth texture
(iii)Irregular shape

(1c)
(i)metabolizing nutrients and detoxifying harmful substances.
(ii)stores essential nutrients such as vitamins and minerals.
(iii)regulate blood sugar levels and cholesterol levels.

(1cii)
Spec D. Grinding: The gizzard helps grind food particles before digestion.
Spec E. Absorption: The intestine absorbs nutrients from digested food.

(1ciii)
Spec D; possession of grit
Spec E; possession of large surface area

(1d)
TABULATE
Under observation
(i)red litmus turn blue
(ii)No effect on blue litmus

-Under inference-
(i) Alkaline
(ii)Not acidic

(1dii)
(i)emulsification of fats
(ii)Give forces it’s colour
(iii) Digestion

(1ei)
Digestive system

(1eii)
D

(1fi)
Heterotrophic

(1fii)
Maize

[5/24, 9:11 AM] Solution: 1.
a.
Phylum: Chordata
Class: Aves

b.
Three observable features of specimen B (whole liver from domestic fowl) could include:
1. Dark red color
2. Smooth texture
3. Irregular shape

c.
(i) Functions of specimen B (whole liver from domestic fowl) to the organism:
1. Metabolism: The liver plays a crucial role in metabolizing nutrients and detoxifying harmful substances.
2. Storage: The liver stores essential nutrients such as vitamins and minerals.
3. Regulation: The liver helps regulate blood sugar levels and cholesterol levels.

(ii) Functions of specimens D (whole gizzard from domestic fowl) and E (whole intestine from domestic fowl) to the organism:
D. Grinding: The gizzard helps grind food particles before digestion.
E. Absorption: The intestine absorbs nutrients from digested food.

(iii) Adaptations of specimens D and E to the functions stated in 1(c)(ii):
D. Tough lining: The gizzard has a tough lining made of keratin to aid in grinding food effectively.
E. Villi: The intestine has finger-like projections called villi to increase surface area for better nutrient absorption.
[5/24, 9:21 AM] Solution: *-BIOLOGY SPECIMENS-*


A] Gill of Fish { Freshly Produced }
B] Whole Liver of a Domestic Fowl with gall bladder attached in a Petridish {Fresh Produce }
C] Lungs from a Domestic Fowl on a White Tile [ Freshly Produced ]
D] Whole Gizzard from a Domestic Fowl Spreed in a Tray { Freshly Produced }
E] Whole Intestine from a Domestic Fowl Spreed in a Tray [ Freshly Produced }
F} Ginger Rhizome { Fresh }
G] Onion Bulb
H] Leaf of Bryophyllum { With Adventurous Root }
J] Cassava Stem
K] Cassava Rubber
L] Thoracic Vertebra
M] Humerus Bone
N] Mango Seed { Dry }
P] Femur Bone
Q] Lumbar Vertebra
R] Orange Seed [ Dry ]
[5/24, 9:36 AM] Solution: *WAEC BIOLOGY PRACTICAL*

(1a)
Phylum: Chordata
Class: Aves

(1b)
(i)Dark red color
(ii)Smooth texture
(iii)Irregular shape

(1c)
(i)metabolizing nutrients and detoxifying harmful substances.
(ii)stores essential nutrients such as vitamins and minerals.
(iii)regulate blood sugar levels and cholesterol levels.

(1cii)
Spec D. Grinding: The gizzard helps grind food particles before digestion.
Spec E. Absorption: The intestine absorbs nutrients from digested food.

(1ciii)
Spec D; possession of grit
Spec E; possession of large surface area

(1d)
TABULATE
Under observation
(i)red litmus turn blue
(ii)No effect on blue litmus

-Under inference-
(i) Alkaline
(ii)Not acidic


*MORE COMING*
[5/24, 9:50 AM] Solution: (2a)
(i)for propagation
(ii)serve as storage organ
(iii)For photosynthesis
(iv)For gaseous exchange

(2bi)
Spec F; for propagation
Spec K; serve as storage organ

(2bii)
Spec F; it is reproductive in nature
Spec K; due to the nature of it surface

(2biii)
Spec F; root
Spec K; stem

More coming
[5/24, 9:50 AM] Solution: (1a)
Phylum: Chordata
Class: Aves

(1b)
(i)Dark red color
(ii)Smooth texture
(iii)Irregular shape

(1c)
(i)metabolizing nutrients and detoxifying harmful substances.
(ii)stores essential nutrients such as vitamins and minerals.
(iii)regulate blood sugar levels and cholesterol levels.

(1cii)
Spec D. Grinding: The gizzard helps grind food particles before digestion.
Spec E. Absorption: The intestine absorbs nutrients from digested food.

(1ciii)
Spec D; possession of grit
Spec E; possession of large surface area

(1d)
TABULATE
Under observation
(i)red litmus turn blue
(ii)No effect on blue litmus

-Under inference-
(i) Alkaline
(ii)Not acidic

(1dii)
(i)emulsification of fats
(ii)Give forces it’s colour
(iii) Digestion

(1ei)
Digestive system

(1eii)
D

(1fi)
Heterotrophic

(1fii)
Maize


[5/24, 9:56 AM] Solution:

(2a)

BIOLOGY PRACTICAL ANSWERS!
++++++++++++++++++++++++++++++++

(1a)
Phylum: Chordata
Class: Aves

(1b)
(PICK ANY THREE)
(i) It is dark red in color with greenish gall bladder
(ii) It has smooth firm texture
(iii) It has an irregular shape
(iv) It is large and lobed, with the attached gall bladder small and enlogated

(1ci)
(PICK ANY THREE)
(i) It helps in metabolizing nutrients and detoxifying harmful substances.
(ii) It stores essential nutrients such as vitamins and minerals.
(iii) It regulate blood sugar levels and cholesterol levels.
(iv) It stores and releases bile
(iv) It helps domestic fowls in digestion fatty food

(1cii)
Specimen D:
(PICK ANY ONE)
-It helps grind food particles before digestion.
-It responds to changes in the coarseness of the diet
-It helps in regulating feed flow

Specimen E:
(PICK ANY ONE)
-The intestine absorbs nutrients from digested food.
-It aids in complete digestion of proteins
-It eliminates waste products

(1ciii)
Specimen D:
-Possession of tough lining made of keratin to aid gringing food effectively

Specimen E: Possession of finger-like projection called villi to increase surface area for better nutrient absorption

(1di)
TABULATE
-Under observation:
(i) Red litmus turn blue
(ii) No effect on blue litmus

-Under inference:
(i) Alkaline
(ii) Basic

(1dii)
(PICK ANY THREE)
(i) It helps in emulsification of fats
(ii) It aids in the absorption of fat-soluble vitamins
(iii) It aids in neutralization of Stomach Acid
(iv) It helps in the excretion of waste products from the liver, including bilirubin and excess cholesterol
(iv) It aids in digestion

(1ei)
Digestive system

(1eii)
Specimen D

(1fi)
Heterotrophic

(1fii)
(PICK ANY ONE)
-Maize
-Fruits
-Soybean
++++++++++++++++++++++++++++++++

(2a)
(i)for propagation
(ii)serve as storage organ
(iii)For photosynthesis
(iv)For gaseous exchange

(2bi)
Spec F; for propagation
Spec K; serve as storage organ

(2bii)
Spec F; it is reproductive in nature
Spec K; due to the nature of it surface

(2biii)
Spec F; root
Spec K; stem

(2c)
TABULATE
Under: Spec F;
(i)small size
(ii)Presence of nodes
(iii) terminal bod id present
(iv) Absence of adventurous root

Under: Spec K;
(i)big size
(ii)Absence of node
(iii)terminal bod is absent
(iv)presence of adventurous root

(2cii)
Grey colour

(2d)
Diagram coming soon
++++++++++++++++++++++++++++++++

(3a)
L-chest (middle portion of there)

Q-Lower back repion of the Spine


(3bi)
TABULATE
(PICK ANY FOUR)
L || Q

UNDER L
(i) Smaller and have a heart-shaped body
UNDER Q
(i) Larger and have a kidney -Shaped body

UNDER L
(ii) occur after the Cervical vertebra
UNDER Q
(ii) occur below the thoraic vertebrae

UNDER L
(iii) Tranverse processes are fairly large
UNDER Q
(iii) Tranverse processes are lage and blunt

UNDER L
(iv) Curve in the posterior direction
UNDER Q
(iv) Curve in the ananterior direction

UNDER L
(v) intervertebral disk is thin
UNDER Q
(v) intervertebral disk is massive


(3bii)
(i) Both have a Single Spinous process projecting Posteriorly.
(ii) Both have Superior and inferior articular.
(iii) Both posseses a pair tranverse processes.
(iv) Both have  a vertebral arch.
(v) Both have vertebral body.

(3ci)
M
(i) Scapula
(ii) Ulna and radius

P
(i) Pelius
(ii) Tibia
(iii) Patella

(3cii)
For L
*Before*
Cervical vertebrae

*After*
Lumbar vertebrae

For Q
*Before*
Thoraic vertebrae

*After*
Sacral vertebrae
++++++++++++++++++++++++++++++++
Completed.!!

MORE COMING

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