WAEC GCE 2024 Biology Objective , Essay and Practical Question & Answer Now Available

BIOLOGY PRACTICAL

(2ai)
A: Monocotyledonae
B: Dicotyledonae

(2aii)
A: Stem
B: Root

(2aiii)
I: Epidermis
II: Cortex
III: Endodermis
IV: Pericycle
V: Xylem
VI: Phloem
VII: Pith
VIII: Epidermis
IX: Cortex
X: Central vascular bundle

(2b)
(i) Protection: V
(ii) Transport of food: II
(iii) Transport of water and mineral salts: III
(iv) Absorbing of water from soil: VIII
(v) Support: VII

(2c)
IV: Large surface area, thin walls for efficient absorption.
VIII: Root hairs increase surface area, thin cell walls for water absorption.

(2d)
(i)A has a circular arrangement of vascular bundles, while B has a scattered arrangement.
(ii)A shows distinct vascular bundles, B does not.
(iii)A has a defined outer layer (epidermis), B shows a less defined boundary.
(iv)A is a typical dicot stem cross-section, B resembles a monocot root cross-section.

(2e)
(i) Transport of food: Translocation
(ii) Transport of water and mineral salts: Transpiration
(iii) Absorption of water from soil: Osmosis

WAEC GCE 2024 BIOLOGY OBJECTIVE
01-10: ADCDCCBDCD
11-20: CCCBCDDABA
21-30: BADADBDDAC
31-40: ABCCCBCCCA
41-50: DCDABCDDBA

2024 WAEC GCE BIOLOGY THEORY ANSWERS

(1ai)
(i)Body structure (number of segments, presence of cephalothorax, etc.)
(ii)Number and structure of appendages (legs, antennae, etc.)
(iii)Presence and structure of wings (if applicable)
(iv)Type of mouthparts and feeding structure

(1aii)
(i)Presence of gills or book lungs (indicating aquatic or terrestrial habitat)
(ii)Structure and adaptation of legs (e.g., webbed feet for aquatic habitat)

(1b)
(i)A semipermeable membrane (e.g., dialysis tubing)
(ii)A sucrose solution of varying concentrations
(iii)A potato or other plant tissue
(iv)A balance or scale to measure mass changes

(1c)
To calculate the length of the drawing, multiply the actual length by the magnification factor.
Length of drawing = actual length × magnification
= 10 cm × 1.5
= 15 cm

(1di)
(i)Accuracy: The drawing should accurately represent the organism or structure being depicted.
(ii)Proportion: The drawing should be in proportion, with all parts of the organism or structure correctly sized relative to each other.
(iii)Labeling: The drawing should be clearly labeled, with all important features identified.
(iv)Clarity: The drawing should be clear and easy to understand, with clean lines and minimal clutter.

(1dii)
(i)Dorsal view: A view of the organism from the back or top.
(ii)Ventral view: A view of the organism from the front or bottom.
(iii)Lateral view: A view of the organism from the side.

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(2a)
The feces of lizards are more solid than those of mammals due to the differences in their digestive systems. Lizards are ectothermic, meaning they rely on external sources of heat to regulate their body temperature. This slower metabolism allows them to extract more water from their food, resulting in more solid and less watery feces compared to the typically more liquid feces of mammals.

(2b)
(PICK ANY FIVE)
(i) Saliva
(ii) Gastric juice
(iii) Pancreatic juice
(iv) Bile
(v) Intestinal juice (from the small intestine)
(vi) Mucus

(2c)
(PICK ANY THREE)
(i) Pepsin
(ii) Trypsin
(iii) Chymotrypsin
(iv) Elastase
(v) Carboxypeptidase A
(vi) Carboxypeptidase B

(2di)
(PICK ANY THREE)
(i) Both are biological catalysts
(ii) Both are involved in regulating biological processes
(iii) Both are produced by specialized cells or tissues
(iv) Both have a specific target or substrate
(v) Both require specific conditions (temperature, pH, etc.) to function optimally
(vi) Both can be affected by inhibitors

(2dii)
In Tabular Form

=HORMONES=
(PICK ANY THREE)
(i) Act as signaling molecules
(ii) Transported in the bloodstream
(iii) Influence distant target cells
(iv) Regulate complex processes
(v) Act at low concentrations
(vi) Have long-lasting effects

=ENZYMES=
(PICK ANY THREE)
(i) Act as catalysts
(ii) Act locally at the site of their production
(iii) Influence specific chemical reactions
(iv) Facilitate specific metabolic processes
(v) Act at higher concentrations
(vi) Have short-lived effects

(2e)
(i) Glucose – 1 molecule
(ii) Water – 6 molecules
(iii) Oxygen – 6 molecules

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(4ai)

Organic evolution refers to the gradual change in the characteristics of living organisms over generations due to processes such as natural selection, genetic mutation, and adaptation. This leads to the development of new species from ancestral forms.

(4aii)

(I) Fossil records.
(II) Comparative anatomy (e.g., (III) homologous and analogous structures).
(III) Embryological similarities.
(IV) Molecular evidence (e.g., DNA and protein similarities).
(V) Biogeographical distribution of species.

(4bi)

The theory of use and disuse, proposed by Jean-Baptiste Lamarck, suggests that organisms can develop or lose characteristics based on how frequently they use or fail to use certain body parts. For example, frequently used body parts become more developed, while unused parts may diminish over generations.

(4bii)

Jean-Baptiste Lamarck.

(4biii)

(I) Giraffe – The lengthening of their necks due to stretching to reach higher leaves.
(II) Ducks – Development of webbed feet for swimming.

(4c)

Mutations are random changes in an organism’s genetic material (DNA or RNA). They introduce new genetic variations, which may provide adaptive advantages in changing environments. Beneficial mutations can increase an organism’s fitness and contribute to evolutionary processes through natural selection.

(4d)

Aestivation: Lizard.
Basking: Lizard.
Territoriality: Monkey.
Hibernation: Polar bear or Bat.