WAEC 2023 Biology (Essay & OBJ) Answers
How to Pass WAEC Examination Excellently
- Know The WAEC Exam Format.
- Study with The WAEC Syllabus.
- Create A Study Timetable.
- Read Your SSCE Notes.
- Read and Study.
- Practice WAEC Past Questions.
- Join A Group Study.
- Practice WAEC Questions Online.
How many questions are to be answered in WAEC?
1a) The classification of living things involves grouping organisms based on their characteristics. The current classification system consists of Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species.
b)
(i) Fungi
1. Decomposition- Fungi decompose organic matter and recycle nutrients, contributing to soil health.
2. Medicine- Some fungi are used in medicine, such as Penicillium, which produces antibiotics.
3. Food- Edible mushrooms are a popular food item across the world. Certain fungi like yeast are used in baking and fermentation to produce wine and beer.
4. Industry- Fungi are used in industries like paper manufacturing and in the production of enzymes like citric acid and gluconic acid.
(ii) Plants
1. Food- Plants are a major source of food for humans and animals.
2. Oxygen production- Through photosynthesis, green plants produce oxygen which is essential to all living organisms.
3. Raw materials- Fibers are obtained from plants and are used to make clothing, paper, and other products. Plants like timber and bamboo are used for construction purposes.
4. Medicine- Many plants contain compounds with medicinal properties that are used in traditional medicine and pharmaceutical industry.
5(a) Sense organs are specialized structures in the body of living organisms that enable them to perceive and respond to environmental stimuli.
(5i)
1. Nose: Responds to airborne chemical substances like aroma or odors.
2. Taste buds: Detect chemicals present in food or solution to give the perception of taste.
3. Olfactory epithelium: Receives and detects dissolved substances in the mouth and throat, giving a sense of smell.
(5b)
1. Male lions: Patrol and mark their territory with urine to protect their pride of females and young ones.
2. Red squirrels: Territorial and have defined territories that they defend and mark using scent glands.
3. Male gorillas: Beat their chests and charge at intruders who try to enter their territory.
5(ii)
1. Swans: Mate for life and form long-term pair bonds that they maintain.
2. Seahorses: Form permanent pair bonds during breeding seasons and raise offspring together.
3. Prairie voles: A species of rodent that forms lifelong bonds and engages in behaviors like grooming and huddling to maintain social bonding.
*5e.*
1. Saprotrophic Nutrition: This type of nutrition involves the breakdown of dead organic matter.
Examples include mushrooms, fungi, and bacteria.
2. Parasitic Nutrition: This type of nutrition involves the absorption of nutrients from a living host.
Examples of organisms that use parasitic nutrition include tapeworms, fleas, and ticks.
3a) The types of relationships are:
I: Decomposition or saprophytic relationship
II: Commensalism
III: Mutualism
IV: Predation
V: Parasitism
3b) In relationship IV:
– Organism B: Prey
– Organism G: Predator
3c) Examples of organisms B to J
B: Dead tree
C: Vulture
D: Lion
E: Hermit crab
F: Sea anemone
G: Snake
H: Bee
J: Sheep
3d)
(i) The relationship that is most beneficial to the ecosystem is III (Mutualism).
(3dii) One reason for this is that mutualistic relationships involve interactions where both organisms benefit from each other’s presence, contributing to the overall stability and productivity of the ecosystem.
3e)
(I) Examples of organism A:
– Fungi (such as mushrooms or molds) that grow on decaying matter
– Bacteria that decompose organic material
(3eii) The group to which organism A belongs is the decomposers or decomposer organisms.
COMPLETED
