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Biology
UTME / JAMB 2000
Reproduction in Plants & Animals
Diagram
Solution
The part labelled II is the
Attached Figure / Diagram
A
mesocarp
B
pericarp
C
endocarp
D
epicarp
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
It is the mesocarp, In a typical fruit the mescarp is the middle layer. It is found in between the endocarp and epicarp
Source: Myschool Past Questions Archive (Record #6561)
Biology
UTME / JAMB 2000
Variety of Organisms & Classification of Living Things
Diagram
Solution
The fruit represented is mainly dispersed by?
Attached Figure / Diagram
A
animals
B
water
C
wind
D
birds
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Coconuts identified above have also adapted several mechanisms to be able to propagate.
Coconuts are dispersed by water, a process called hydrochory. Coconuts are well-suited for aquatic dispersal because they are:
Buoyant: The coconut's dry, fibrous mesocarp and hard endocarp make it float when its external layers dry out.
Waterproof and salt-resistant: The coconut's husk protects the seed from salty ocean water and predators.
Large and heavy: Coconuts are too heavy to be carried by wind or squirrels.
They rely majorly on seed dispersal through water and by human activities.The primary method of coconut dispersal is by water, a process known as hydrochory.
Source: Myschool Past Questions Archive (Record #6562)
Biology
UTME / JAMB 2000
Variety of Organisms & Classification of Living Things
Diagram
Solution
The range at which soil essential elements concentration is recorded for optimal plant growth is marked
Attached Figure / Diagram
A
IV
B
III
C
II
D
I
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
I - Lag phase II - log phase or exponential phase (Growth) III - Stationary phase IV - Death phase
The range at which soil essential elements concentration is recorded for optimal plant growth is during the log phase, which is a phase of rapid growth in plants:
Log phase: This is the phase of rapid growth in plants.
Lag phase: This is the initial phase of growth when the rate of growth is very slow.
Stationary phase: This is the phase when the rate of growth starts decreasing and finally stops
Stationary / steady phase is where finally growth stops.
The range at which soil essential elements concentration is recorded for optimal plant growth is marked II.
Source: Myschool Past Questions Archive (Record #6568)
Biology
UTME / JAMB 2000
Nervous, Hormonal Coordination & Sense Organs
Solution
Which of the following growth activities in plants is brought about by gibberellins?
A
Rapid cell division
B
Tropic response
C
Cell elongation
D
Main cell elongation
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Gibberellins are plant growth regulators that cause cell elongation. Gibberellins stimulate cell elongation by altering the rheological properties of the cell wall; as a consequence, the water potential of the cell is lowered allowing for water uptake and therefore an increase in cell volume.
Cytokinins are the plant hormones that promote rapid cell division.
Auxin is the plant hormone that controls tropic responses in plants.Auxin causes cells on the shaded side of a plant to grow longer, which makes the plant bend toward the light(Phototropism). Auxin has the opposite effect in roots, where the shaded side grows less, causing the root to bend away from the light(Geotropism).
Source: Myschool Past Questions Archive (Record #6569)
Biology
UTME / JAMB 2000
Respiration & Gaseous Exchange
Solution
Which of the following are adaptations of animals to aquatic habitats?
A
Gills, streamlined bodies and lateral lines
B
Lateral line, streamlined bodies and lungs
C
Gills, scaly skin and lungs
D
Gills, streamlined bodies and spiracles
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Aquatic animals have many adaptations that help them survive in water, including:
Streamlined body: This shape reduces water resistance and helps animals swim easily.
Gills: These respiratory organs allow aquatic animals to extract oxygen from water.
The lateral line is a network of sensory organs that helps fish sense vibrations, pressure changes, and water movements.
Source: Myschool Past Questions Archive (Record #6570)
Biology
UTME / JAMB 2000
Basic Ecological Concepts, Ecosystems & Biomes
Solution
Which of the following is an adaptation of tropical rainforest species?
A
Few stomata
B
Thick bark
C
Buttress roots
D
Reduced leaves
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Tropical rainforest species have buttress roots for their adaptations. Few stomata, Thick bark and Reduced leaves adaptive features of Desert plants. Option C is the correct answer
Source: Myschool Past Questions Archive (Record #6571)
Biology
UTME / JAMB 2000
Basic Ecological Concepts, Ecosystems & Biomes
Solution
In a food chain, each succeeding level in a forward direction represents
A
an increase in the number of individuals
B
a decrease in the number of individuals
C
an increase in the biomass of individuals
D
a gain in the total energy being transferred
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
A food chain describes how energy and nutrients move through an ecosystem. At the basic level there are plants that produce the energy, then it moves up to higher-level organisms like herbivores. After that when carnivores eat the herbivores, energy is transferred from one to the other.
Source: Myschool Past Questions Archive (Record #6572)
Biology
UTME / JAMB 2000
Variety of Organisms & Classification of Living Things
Solution
The disaster that would have the least destructive impact on animal life and balance in nature is
A
chemical pollution
B
forest fires
C
oil spillage
D
grasshopper pests
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
All the options have destructive impacts on human but the grasshopper pest has the least. Option D
Source: Myschool Past Questions Archive (Record #6573)
Biology
UTME / JAMB 2000
Basic Ecological Concepts, Ecosystems & Biomes
Solution
The legs and beak of an egret resemble those of the heron because they
A
both feed on fishes
B
are both birds
C
occupy similar niche
D
occupy the same trophic level
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
A trophic level is defined as the role an organism plays within a food chain. These roles can include primary producers, consumers, and detritivores. Both egrets and the heron play the same role in a food chain. However, the long legs and the beaks of egret and herons are adaptive for their ecological niche as well as their feeding behaviour. These are more comprehensive compared to other adaptive features.
Source: Myschool Past Questions Archive (Record #6574)
Biology
UTME / JAMB 2000
Basic Ecological Concepts, Ecosystems & Biomes
Solution
The factors that determine the distribution of vegetation zones are
A
temperature, light, rain and humidity
B
light, humidity, air and mist
C
temperature, light, air and humidity
D
humidity, snow, frost and dew
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Some of the vegetative zones we have are tropical rainforest, grasslands, deserts, montane forests, deciduous forests etc. However, the factors that determine the distribution of vegetation zones are climatic factors(temperature,sunlight, wind,humidity etc),edaphic factors(Soil-related), biotic factors(animals etc).
Source: Myschool Past Questions Archive (Record #6575)
Biology
UTME / JAMB 2000
Variation & Genetics (Heredity)
Solution
A cross between an albino female and a genetically normal male will result in offspring that are
A
all albino
B
all phenotypically normal
C
all genetically normal
D
half albino and half normal
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
A phenotypic ratio is a numerical comparison of the different observable traits in an organism's offspring. Phenotypic ratios are used to compare one phenotype to another, and are often analyzed during genetic studies.
The albino female and a genetically normal male will result in offspring that have traits that are common of the two parents.- option B is the answer
Source: Myschool Past Questions Archive (Record #6576)
Biology
UTME / JAMB 2000
Basic Ecological Concepts, Ecosystems & Biomes
Solution
The pollutants that contribute to the depletion of the ozone layer in the atmosphere are
A
radioactive materials
B
oxides of sulphur
C
oxides of carbon
D
chlorofluorocarbons
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Chlorofluorocarbons (CFCs) deplete the ozone layer by releasing chlorine atoms that react with ozone molecules. When chlorofluorocarbons (CFC) drift upwards towards the stratosphere, they come in contact with the Ozone layer. This leads to a chemical reaction where the CFC molecules are broken up by ultraviolet radiation, releasing chlorine atoms, which are able to destroy ozone molecules. The correct answer is option D
Source: Myschool Past Questions Archive (Record #6577)
Biology
UTME / JAMB 2000
Variety of Organisms & Classification of Living Things
Solution
The surest way to combine the best qualities of both parents in the offspring is by
A
cross-breeding
B
inbreeding
C
selective breeding
D
pure breeding
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Crossbreeding, or hybridization, is the process of mating two different varieties or strains to produce offspring with desirable traits from both parents.
Source: Myschool Past Questions Archive (Record #6578)
Biology
UTME / JAMB 2000
Variation & Genetics (Heredity)
Solution
Blood grouping in human beings is derived from combinations of
A
two different alleles
B
four different alleles
C
three different alleles
D
two different genes
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
The four main blood groups A, B, AB, and O are controlled by three alleles: A, B, and O.The four main blood groups A, B, AB, and O are controlled by three alleles: A, B, and O. As humans are diploid, only two of these can be present in any one genotype. In other words, only two of these alleles are present at the same time in a person's cell.
Source: Myschool Past Questions Archive (Record #6579)
Biology
UTME / JAMB 2000
Supporting Tissues & Skeletal System
Solution
The older fossil-bearing rocks, in contrast to the more recent ones, are more likely to contain?
A
animal rather than plant remains
B
invertebrates rather than birds
C
flowering plants rather than mosses
D
reptiles rather than fishes
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The Older fossil-bearing rocks contain more invertebrates than birds because vertebrates first appear in the fossil record about 500 million years ago. Fossils are most commonly found in sedimentary rocks because organisms must be buried quickly to become fossilized. When buried, minerals from water accumulate in the bones of dead plants and animals, which leads to the formation of fossil.
Source: Myschool Past Questions Archive (Record #6580)