WAEC 2023 BIOLOGY QUESTION AND ANSWERS THEORY AND OBJECTIVES.
In this post you will read the waec 2023 biology obj & theory answers.
(1a)
Classification of living things is the process of organizing and categorizing organisms into hierarchical groups based on their similarities and evolutionary relationships. It involves grouping organisms into various levels of classification, from broad categories to more specific ones, to facilitate the study and understanding of biodiversity.
(1bi)
FUNGI:
(i) They are used in the decomposition of organic matter
(ii) They form symbiotic relationships with plants
(iii) They are used to combat plant diseases
(iv) They are used in the production of enzymes
(1bii)
PLANTS:
(i) They serve as primary source of food for humans and animals
(ii) They provide raw materials for farming
(iii) They are applied in medicinal and pharmaceutical industry
(iv) They contribute to soil stabilization.
(1c)
[TABULATE]
PHYLA OF KINGDOM ANIMALIA=
(i) Phylum Chordata
(ii) Phylum Arthropoda
(iii) Phylum Mollusca
(iv) Phylum Porifera
=EXAMPLES=
(i) Homo sapiens
(ii) Apis mellifera
(iii) Octopus vulgaris
(iv) Spongilla lacustris
(2a)
[FILL IN THE TABLE WITH THIS]
IRON:
Function:
(PICK ANY ONE)
-Chlorophyll formation
-Electron transport in photosynthesis
-Enzyme activation
-Nitrogen fixation
Effects of deficiency in plants:
(PICK ANY ONE)
-Chlorosis (yellowing of leaves)
-Stunted growth
-Reduced fruit and seed production
-Interference with nutrient uptake
MOLYBDENUM:
Function:
(PICK ANY ONE)
-Nitrogen fixation
-Enzymatic reactions
-Iron uptake and utilization
-Seed germination and growth
-Chlorophyll formation
Effects of deficiency in plants:
(PICK ANY ONE)
-Reduced nitrogen fixation
-Chlorosis (yellowing of leaves)
-Impaired sulfur metabolism
-Abnormal phosphorus uptake
-Altered enzyme activity
POTASSIUM
Function:
(PICK ANY ONE)
-Osmotic regulation
-Enzyme activation
-Protein synthesis
Effects of deficiency in plants:
(PICK ANY ONE)
-Stunted growth.
-Leaf chlorosis.
-Weak stems.
-Reduced flower and fruit production.
-Increased susceptibility to diseases and pests.
COPPER
Function:
(PICK ANY ONE)
-It plays a vital role in activating various enzymes within plants
-It helps to facilitate photosynthesis
-It helps facilitate respiration in plants
(PICK ANY ONE)
Effects of deficiency in plants:
-Stunted growth
-Yellowing of leaves
-Death of plant tissue
-Reduced fertility
-Increased susceptibility to diseases
NITROGEN
Function:
(PICK ANY ONE)
-It helps in building proteins
-It is a fundamental constituent of nucleic acids and DNA
-It helps in formation of chlorophyll
-It helps in energy transfer and metabolism
-It is an enzyme co-factor
Effects of deficiency in plants:
(PICK ANY ONE)
-Reduced photosynthesis
-Poor protein synthesis
-Leaf necrosis
-Increased susceptibility to diseases and pests.
-Impaired nutrient transport
(2b)
(PICK ANY THREE)
(i) Fruits and Vegetables
(ii) Grains and Cereals
(iii) Legumes and Pulses
(iv) Nuts and Seeds
(v) Dairy Products
(vi) Meat, Poultry, and Fish
(2ci)
BUCCAL CAVITY:
(PICK ANY TWO)
(i) The buccal cavity is the entry point for food and liquids into the digestive system.
(ii) The buccal cavity is responsible for chewing or masticating food.
(iii) The buccal cavity contains salivary glands that produce saliva.
(iv) The buccal cavity plays a vital role in speech production.
(2cii)
DUODENUM
(PICK ANY TWO)
(i) The duodenum receives partially digested food from the stomach and continues the process of digestion.
(ii) The duodenum is involved in the absorption of nutrients from digested food.
(iii) The duodenum plays a role in regulating the overall process of digestion.
(iv) The duodenum secretes several important hormones that regulate various aspects of digestion.
(2ciii)
STOMACH
(PICK ANY TWO)
(i) One of the primary roles of the stomach is to store food temporarily after it has been ingested.
(ii) The stomach aids in the mechanical digestion of food through muscular contractions known as peristalsis.
(iii) The stomach secretes gastric juices, primarily composed of (HCl) and enzymes such as pepsin, which play a crucial role in chemical digestion.
(iv) The stomach controls the rate at which food is released into the small intestine.
(2d)
Glucose and fructose
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: Predatori
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.
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.
BIOLOGY OBJECTIVE ANSWERS
01-10: CABADCCBCD
11-20: DBCDDBDBBC
21-30: ADABDAADCD
31-40: BBCBDCBBBA
41-50: ABCCBCACDA
COMPLETED.
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