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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)
Biology
UTME / JAMB 2000
Variety of Organisms & Classification of Living Things
Solution
In a group of male Agama lizards, the one with the brightest head colour is the
A
dominant
B
youngest
C
oldest
D
largest
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
In a group of male agama lizards, the dominant male is the one with the brightest head color because he is establishing dominance through displays of his colours. Male agama lizards also establish dominance by threatening each other through nodding and weaving
Source: Myschool Past Questions Archive (Record #6581)
Biology
UTME / JAMB 2000
Variation & Genetics (Heredity)
Solution
Example of water-borne and sex linked diseases are?
A
taeniasis and malaria
B
cholera and gonorrhoea
C
typhoid and syphilis
D
dracunculiasis and haemophilia
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Dracunculiasis, also called Guinea-worm disease, is a parasitic infection by the Guinea worm, Dracunculus medinensis. A person becomes infected from drinking water that contains water fleas infected with guinea worm larvae.
some of the more familiar sex-linked traits are hemophilia, red-green color blindness, congenital night blindness, some high blood pressure genes, Duchenne muscular dystrophy, and also Fragile X syndrome.
Source: Myschool Past Questions Archive (Record #6582)
Biology
UTME / JAMB 2000
Adaptation & Evolution
Solution
The mutation theory of organic evolution was propounded by
A
Gregor Mendel
B
Hugo de Vries
C
Jean Lamarck
D
Charles Darwin
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
In his own time, Hugo De Vries was best known for his mutation theory
Source: Myschool Past Questions Archive (Record #6583)
Biology
UTME / JAMB 2000
Population Ecology, Habitats & Conservation
Solution
A certain savanna grasshopper changes colour from green during the rainy season to brown during the dry season and black after dry season bush fires. The reason for these colour changes is that the
A
grasshopper is getting older
B
environmental temperature is changing
C
grasshopper is avoiding predation
D
grasshopper is frequently moulting
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Savanna grasshoppers change color to camouflage themselves from predators and to match their surroundings:
Rainy season: Grasshoppers are green in the middle of the rainy season when vegetation is lush.
Dry season: Grasshoppers are brown in the dry season when vegetation is dry.
After a fire: Grasshoppers quickly evolve darker colors to match the altered habitat after a fire. These darker colors disappear as the landscape recovers.
Source: Myschool Past Questions Archive (Record #6584)
Biology
UTME / JAMB 2000
Variety of Organisms & Classification of Living Things
Solution
Complex social behaviour and organization are found mostly in
A
insects
B
birds
C
reptiles
D
mammals
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Complex social behavior and organization are mostly found in mammals. Mammals are warm-blooded animals that have fur or hair, and most of them give birth to live young. Many mammals live in complex social groups and have well-defined social structures.
Source: Myschool Past Questions Archive (Record #6585)
Biology
UTME / JAMB 2000
Population Ecology, Habitats & Conservation
Solution
Which of the following structural features are adapted for uses other than water conservation?
A
Succulent stems
B
Scales in animals
C
Spines in plants
D
Feathers in birds
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Succulents are plants with thickened, fleshy parts that store water in arid climates or soil conditions.
Succulent stems have several adaptations that help them in ways other than water conservation, including:
Thermal capacity
Succulents have a high thermal capacity, which means they can tolerate high tissue temperatures. This is because their size, density, and water content help slow radiative heat loss at night.
Habitat
Succulents can provide shelter and habitat for reptiles like lizards and snakes. The cool, moist environment of their leaves and stems can be especially important in arid regions.
Shade
Succulents can provide shade to the plant by growing straight up. This shade slows down transpiration, which helps the plant keep its water longer.
Color
Some succulents have white-green stems to help reflect sunlight and prevent overheating.
Source: Myschool Past Questions Archive (Record #6586)
Biology
UTME / JAMB 2000
Population Ecology, Habitats & Conservation
Solution
Which of the following structural features are adapted for uses other than water conservation?
A
Succulent stems
B
Scales in animals
C
Spines in plants
D
Feathers in birds
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Succulents are plants with thickened, fleshy parts that store water in arid climates or soil conditions.
Succulent stems have several adaptations that help them in ways other than water conservation, including:
Thermal capacity
Succulents have a high thermal capacity, which means they can tolerate high tissue temperatures. This is because their size, density, and water content help slow radiative heat loss at night.
Habitat
Succulents can provide shelter and habitat for reptiles like lizards and snakes. The cool, moist environment of their leaves and stems can be especially important in arid regions.
Shade
Succulents can provide shade to the plant by growing straight up. This shade slows down transpiration, which helps the plant keep its water longer.
Color
Some succulents have white-green stems to help reflect sunlight and prevent overheating.
Source: Official Exam / Past Question Archive
Mathematics
UTME / JAMB 1999
Sets, Logic & Venn Diagrams
Solution
A group of market women sell at least one of yam, plantain and maize. 12 of them sell maize, 10 sell yam and 14 sell plantain. 5 sell plantain and maize, 4 sell yam and maize, 2 sell yam and plantain only while 3 sell all the three items. How many women are in the group?
A
25
B
19
C
18
D
17
medium Difficulty
Verified Correct Answer: Option A
Step-by-Step Mathematical Solution
Let the three items be M, Y and P.
n{M ∩ Y} only = 4-3 = 1
n{M ∩ P) only = 5-3 = 2
n{ Y ∩ P} only = 2
n{M} only = 12-(1+3+2) = 6
n{Y} only = 10-(1+2+3) = 4
n{P} only = 14-(2+3+2) = 7
n{M∩P∩Y} = 3
Number of women in the group = 6+4+7+(1+2+2+3) as above =25 women.
Source: Myschool Past Questions Archive (Record #6)
Mathematics
UTME / JAMB 1999
Indices, Logarithms & Surds
Solution
If log\(_810\) = X, evaluate log\(_85\) in terms of X.
A
\(\frac{1}{2}\)X
B
X-\(\frac{1}{4}\)
C
X-\(\frac{1}{3}\)
D
X-\(\frac{1}{2}\)
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
\(log_810\) = X = \(log_8{2 x 5}\)
\(log_82\) + \(log_85\) = X
Base 8 can be written as \(2^3\)
\(log_82 = y\)
therefore \(2 = 8^y\)
\(y = \frac{1}{3}\)
\(\frac{1}{3} = log_82\)
taking \(\frac{1}{3}\) to the other side of the original equation
\(log_85 = X-\frac{1}{3}\)
explanation courtesy of Oluteyu and Ifechuks
OR
Given \(\log_8 10 = X\), we can express \(\log_8 5\) as follows:
\(\log_8 5 = \log_8 \left( \frac{10}{2} \right) = \log_8 10 - \log_8 2\)
Using the change of base formula, we find:
\(\log_8 2 = \frac{\log 2}{\log 8} = \frac{1}{3}\)
Thus, substituting back, we get: \(\log_8 5 = X - \log_8 2 = X - \frac{1}{3}\)
Source: Myschool Past Questions Archive (Record #9)