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Biology
UTME / JAMB 1995
Variety of Organisms & Classification of Living Things
Solution
The F1 of a cross between a tall and a dwarf plant was tall. The F1 was advanced to F2. How many of 120F2 plants will be dwarf?
A
30
B
60
C
90
D
120
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
See the image above
Source: Myschool Past Questions Archive (Record #5669)
Biology
UTME / JAMB 1995
Variation & Genetics (Heredity)
Solution
All the sons of a colour-blind woman will be coloured blind regardless of the state of the father because
A
the egg determines the phenotype of the son
B
sons inherit the sex chromosome of their mothers
C
the father's sex chromosomes is weaker in sons
D
sex-linked traits express dominance in females
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Colour blindness, specifically red-green colour blindness, is a sex-linked recessive trait, meaning the genes responsible are located on the X chromosome, making it more common in males.
In the case of X-linked dominant traits, a single copy of the dominant allele on the X chromosome is sufficient for a female to express the trait, as they have two X chromosomes. If a female inherits one X chromosome with a dominant allele, she will express the trait, regardless of whether the other X chromosome carries a recessive allele.
Males with an X-linked dominant trait will always express it, as they only have one copy of the X chromosome.
X-linked recessive traits are expressed in females only if they inherit two copies of the recessive allele, one on each X chromosome.
Source: Myschool Past Questions Archive (Record #5671)
Biology
UTME / JAMB 1995
Adaptation & Evolution
The slender, long and slightly curved beak of the sun-bird is an adaptation for breeding for feeding on
A
nectar
B
small seeds
C
big seeds
D
insects
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #5672)
Biology
UTME / JAMB 1995
Variety of Organisms & Classification of Living Things
Scales on reptiles are a feature for
A
conserving water
B
conserving food
C
protecting the skin
D
locomotion
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #5673)
Biology
UTME / JAMB 1995
Adaptation & Evolution
The colour of the ventral surface of a fish is lighter than that of the dorsal. This is mainly
A
an adaptation for movement
B
an adaptation for camouflage
C
for attracting mates
D
for regulating body temperature
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #5675)
Biology
UTME / JAMB 1995
Basic Ecological Concepts, Ecosystems & Biomes
The least evidence in support of the theory of evolution is provided by the study of
A
anatomy
B
ecology
C
geology
D
embryology
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #5676)
Biology
UTME / JAMB 1995
Variety of Organisms & Classification of Living Things
Solution
From which group of animals are the mammals generally believed to have most recently evolved?
A
Reptiles
B
Fish
C
Amphibians
D
Birds
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
The mammals are believed to have evolved from Therapsid (mammal-like) reptiles some 220 million years ago in the Triassic period, before the first birds.
So, the correct answer is 'Reptiles'
A major transition in the evolution of life occurred when mammals evolved from one lineage of reptiles. This transition began during the Permian (286 - 248 million years ago) when the reptile group that included Dimetrodon gave rise to the "beast-faced" therapsids. (The other major branching, the "lizard-faced" sauropsids, gave rise to birds and modern reptiles). These mammal-like reptiles in turn gave rise to the cynodonts e.g. Thrinaxodon during the Triassic period.
Source: Myschool Past Questions Archive (Record #5677)
Biology
WAEC / WASSCE 1995
Variety of Organisms & Classification of Living Things
At what level of organisation is Amoeba?
A
Tissue
B
Organ
C
Cellular
D
System
E
Filament
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #18081)
Biology
WAEC / WASSCE 1995
Variety of Organisms & Classification of Living Things
Which of these could be regarded as an advantage of complexity in higher organisms?
A
there is no cellular differentiation
B
Cellular differentiation leads to loss of independence of the cells
C
Complexity stops at cellular differentiation only
D
Cellular differentiation leads to internal structural specialization
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #18083)
Biology
WAEC / WASSCE 1995
Variety of Organisms & Classification of Living Things
Which of the following organisms is one-celled and free-living?
A
Volvox
B
Spirogyra
C
Rhizopus
D
Chlamydomonas
E
Hydra
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #18094)
Biology
WAEC / WASSCE 1995
Cell Structure, Organization & Cell Division
One of the differences between plant and animal cells is that in plants
A
'cells have less distinct outline, but animal cells have distinct outline
B
ell wall is made of cellulose, but animal cell wall is made of chitin
C
large vacuoles are absent, but present in animals
D
plastids are absent, but present in animals
E
carbohydrates are stored as starch, but as glycogen in animals.
medium Difficulty
Verified Correct Answer: Option E
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #18096)
Biology
WAEC / WASSCE 1995
Respiration & Gaseous Exchange
Carbondioxide enters the stomata during photosynthesis through the process known as
A
osmosis
B
active transport
C
diffusion
D
inhalation
E
ventilation
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #18099)
Biology
WAEC / WASSCE 1995
Supporting Tissues & Skeletal System
Which of the following groups carry out similar functions in living things?
A
Vertebral column, chitin, and guard cells
B
Sclerenchyma, cartilage and chitin
C
Tendon, chitin and neurone
D
Collenchyma, Intercellular spaces and blood vessels
E
Blood vessels, lymph and shell
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #18102)
Biology
WAEC / WASSCE 1995
Supporting Tissues & Skeletal System
Which of the following statements is correct?
A
biceps muscles has its origin on the head of the humerus
B
biceps muscle is inserted at the ulna
C
triceps muscle originated at the scapula and head of the humerus
D
ulna is pulled up when the biceps is relaxed
E
radius is the point of insertion of triceps muscle
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #18112)
Biology
WAEC / WASSCE 1995
Supporting Tissues & Skeletal System
Solution
Which of the following pairs of tissues is responsible for strengthening the plant?
A
Phloem and Epidermis
B
Parenchyma and Cambium
C
Collenchyma and Sclerenchyma
D
Collenchyma and Cambium
E
Xylem and Cambium
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Collenchyma cells have thin primary walls with some areas of secondary thickening. Collenchyma provides extra mechanical and structural support, particularly in regions of new growth. Sclerenchyma cells have thick lignified secondary walls and often die when mature. Sclerenchyma provides the main structural support to a plant.
Source: Myschool Past Questions Archive (Record #18114)