JAMB - Biology (2025)

1
The process that brings about the cooling effect on the body of mammals is
Sagot
(A)
sweat excretion
2
Which of the following controls protein and enzyme syntheses in the cytoplasm of the cell?
Sagot
(B)
Nucleus
3
Use the diagram above to answer the question that follows.

The structure labelled I is adapted for
Sagot
(D)
sucking
4
A complex feeding relationship between organisms in a habitat that involves transfer of energy in form of food is
Sagot
(A)
food web
5
One of the characteristics of insect pollinated flowers is
Sagot
(C)
scented flowers
6
The process by which plants absorb water from the soil through their roots is
Sagot
(C)
osmosis
7
The bright colouration of the flower of a flowering plant is an adaptation for
Sagot
(A)
reproduction
8
Use the diagram above to answer the questions that follow

The endocrine gland that is located in the part labelled I is
Sagot
(C)
pituitary
9
One of the components of peripheral nervous system is
Sagot
(D)
sensory neurones
10
When the cotyledons appear above the soil during germination is called
Sagot
(B)
epigeal
11
The type of teeth used for tearing in man is labelled
Sagot
(D)
II
12
Which of these animals create their natural habitats in burrows?
Sagot
(A)
Bush rat
13
The green-brown colour of grasshopper's body in dry grass field is an adaptation for
Sagot
(A)
camouflage
14
Which of the following is an advantage of cross fertilization?
Sagot
(B)
It leads to the production of healthier offspring.
15
In most vertebrates, the common basic plan with a skull, vertebral column and a pair of girdle is an evidence of evolution from
Sagot
(C)
comparative anatomy
16
Example of animal exhibiting mating colouration is
Sagot
(A)
agama lizard
17
Which of the following is the excretory organ in birds?
Sagot
(B)
kidneys
18
Whose theory of evolution supports that characters acquired through use or disuse are transmitted to offspring?
Sagot
(D)
Larmark
19
The most suitable soil for crops cultivation in Nigeria is
Sagot
(B)
loamy
20
When calyx of a flower is joined together, it is called
Sagot
(A)
gamosepalous
21
Which of the following statements about poliomyelitis is correct?
Sagot
(D)
It is capable for paralysing the limbs.
22
What is the phenotype of the offspring produced in F\(_1\)?
Sagot
(D)
Heterozygous tall
23
The cortex of a herbaceous stem is made up of
Sagot
(D)
parenchyma and collenchyma
24
The most advanced spermatophyte that forms the largest group of plant kingdom is the
Sagot
(B)
angiosperm
25
Which of the following is a medium of transportation in animal cells?
Sagot
(D)
Blood
26
The part labelled I is the
Sagot
(D)
nucleus
27
Which of these is an estuarine habitat?
Sagot
(A)
Lagoon
28
The mouth parts of a grasshopper are adapted for
Sagot
(C)
biting and chewing
29
The following are factors that affect the population growth of an organism except
Sagot
(C)
natality
30
In ecological succession, the final stable community is called
Sagot
(A)
climax
31
The innermost layer of mammalian epidermis is
Sagot
(D)
malphigian layer
32
In a cross involving a heterozygous red flower plant (Rr) and a white flowered plant (rr), what is the probability that the offspring will be Rr?
Sagot
(A)
\(\frac{1}{2}\)
33
The structure that helps in the formation of cilia and flagella is
Sagot
(B)
centriole
34
The vertebrate bone responsible for the attachment of the abdominal muscles is
Sagot
(C)
lumber
35
The canine teeth are prominent in which group of animals?
Sagot
(A)
Carnivores
36
Translocation of manufactured food in plants is through the
Sagot
(B)
phloem cells
37
The most advanced organism in an evolutionary trend among the following is
Sagot
(C)
earthworm
38
One of the following adapts baobab tree to savanna habitat.
Sagot
(D)
Presence of thick bark
39
Albinism is a disorder caused by
Sagot
(C)
recessive genes
40
An example of a reflex action is
Sagot
(C)
coughing
41
Which of the following is an example of vestigial structure?
Sagot
(B)
Human appendix
42
The correct base pair in DNA molecule is
Sagot
(D)
adenine - thymine
43
Population replacement among species of organisms in a given habitat under competition is due to
Sagot
(C)
natural selection
44
Appendix in humans and caecum in herbivores are evidences of evolution from
Sagot
(A)
vestigial organ
45
A form of adaptive colouration that helps animals to remain unnoticed is
Sagot
(D)
countershading
46
Genetically Modified Organisms (GMO) food products are of benefit to farmers because they are
Sagot
(A)
resistant crop varieties
47
The variation that can be applied in crime detection is
Sagot
(D)
fingerprints
48
The date palm is commonly planted in Sahel zone of
Sagot
(B)
Borno
49
The region of a flower stalk attached to flower parts is
Sagot
(D)
receptacle
50
Which of the following processes takes place in the carbon cycle?
Sagot
(A)
Combustion
51
An instrument used in measuring plants growth is
Sagot
(B)
auxanometer
52
Chlamydomonas belongs to the phylum
Sagot
(B)
protophyta
53
The part of the flower that is brightly coloured and attract pollinating agents such as insects is labelled
Sagot
(A)
III
54
Which of the following blood groups will clump when mixed with anti-a antibody serum?
Sagot
(A)
A and AB
55
Which of these is the correct arrangement of tissues in herbaceous roots from the circumference to the center?
Sagot
(A)
piliferous layer, cortex, pericycle, vascular tissue and pith
56
The part labelled I is the
Sagot
(C)
shell
57
The function of the organelle labelled II is to
Sagot
(D)
coordinate the activities of the cell
58
The cell component that stores waste products is the
Sagot
(C)
vacuoles
59
Which of these plants is considered to be common in an estuarine habitat?
Sagot
(D)
Mangrove
60
Renal artery branches and divides into a mass of blood capillaries in the Bowman's capsule called
Sagot
(C)
glomerulus
61
Glucose → ethanol + CO\(_2\)

The chemical reaction above represents the process of
Sagot
(B)
fermentation
62
Agglutination occurs in blood transfusion when the
Sagot
(A)
antigen and antibody in the donor and the recipient are incompatible
63
Part of the littoral zone of the marine habitat above the high tide mark, wetted by spray of water from breaking of waves is referred to as the
Sagot
(A)
splash zone
64
Which of the following differentiates photosynthesis from respiration?
Sagot
(B)
Oxygen is usually liberated.
65
Use the diagram above to answer the questions that follow

The part labelled II is the
Sagot
(A)
Liver
66
In which state of Nigeria is Obudu game reserve located?
Sagot
(A)
Cross Rivers
67
In Nigeria, the major climatic factor that determines the distribution of organisms is
Sagot
(D)
rainfall
68
The slender and stick-like shapes of the stick insect is a structural adaptation for
Sagot
(C)
protection and defense
69
In a community with limited resources, the less vigorous species are eliminated due to
Sagot
(C)
competition
70
Which of the following statements is correct about sedimentation of a given soil?
Sagot
(A)
Decaying organic matter remains afloat.
71
Which of the following exists at the organ level of organization?
Sagot
(C)
Onion bulb
72
The organization that provides emergency needs of children globally is
Sagot
(A)
UNICEF
73
A repeating unit of a very large DNA molecule is made up of
Sagot
(C)
nucleotides
74
Which of the following is an effect of carbon monoxide on humans?
Sagot
(B)
Reducing oxygen carrying capacity of blood
75
The constantly dividing cells found at the apex of roots and stem during growth is
Sagot
(B)
apical
76
Macronutrients required by plants include
Sagot
(D)
Calcium
77
The longest single bone in human is the
Sagot
(C)
femur
78
One characteristic which differentiates bats from birds is that bats
Sagot
(D)
possess mammary glands
79
The part labelled II is the
Sagot
(C)
uterus
80
The biological association between bacteria and protozoa in the rumen of cattle is an example of
Sagot
(A)
symbiosis
81
In which of the following organisms does niche differentiation serve as a means of reducing intraspecific competition?
Sagot
(C)
Tilapia
82
Seaweeds and Barnacles are common flora and fauna found in which of these habitats?
Sagot
(D)
Marine
83
Competition between cow and goat for scarce grasses during dry season can be described as
Sagot
(C)
interspecific
84
The oxygen transported to all parts of the body during blood circulation is used for the
Sagot
(D)
release of energy from food
85
The presence of tiny, non-functional hind leg bones inside a whale's body suggests that whales
Sagot
(B)
evolved from ancestors that had legs
86
The genetic make up of an organism is referred to as the
Sagot
(D)
genotype
87
The ability of chameleon to change its colour to that of the environment is for
Sagot
(C)
defence
88
One of the following is a reflex action
Sagot
(A)
sneezing
89
Proteins are macromolecules made of smaller units called
Sagot
(D)
amino acids
90
Transparency of water is measured using a
Sagot
(C)
secchi disc
91
The maximum number of organisms that the resources in the habitat can support is referred to as
Sagot
(C)
carrying capacity
92
Desert plants are usually called
Sagot
(D)
xerophytes
93
An example of a plant whose flower is dispersed by wind is
Sagot
(D)
cypsela
94
An example of a saprophytic organism is
Sagot
(A)
rhizopus
95
Absorption of nutrients in ferns is through
Sagot
(D)
rhizome
96
Which of these insects has a piercing and sucking mouthpart?
Sagot
(A)
mosquito
97
The segregation of genes occurs during
Sagot
(A)
gamete formation
98
Which of the following is a behavioural adaptation of animals for avoiding adverse weather conditions?
Sagot
(C)
Hibernation
99
A medium of transportation of materials in plants is the
Sagot
(C)
cell sap
100
The artery that carries blood to the heart is
Sagot
(A)
coronary
101
The blood vessel that takes away deoxygenated blood from the kidney is
Sagot
(A)
renal vein
102
The relationship between fungus and alga in lichen is an example of
Sagot
(B)
mutualism
103
The digestive enzyme pepsin is active in
Sagot
(C)
acidic medium
104
One of the following is an epidemic diseases in Nigeria
Sagot
(D)
cholera
105
The two - hoofed toes of camels allow easy walking on desert because of
Sagot
(B)
enlarged foot surface
106
Which of these animals uses buccal respiration?
Sagot
(A)
Toad
107
The prevalence of pests and diseases which affect plants and animals in a terrestrial habitat is
Sagot
(C)
biotic factor
108
The heritable disease caused by distorted shape of the red blood cell, hindering free flow of blood in the vessel is
Sagot
(D)
sickle cell anaemia
109
Use the illustration above to answer the question that follows

What is the genotypic ratio of the F\(_2\) generation?
Sagot
(D)
1 : 2: 1
110
A structure associated with an open circulatory system is
Sagot
(D)
haemocoel
111
Long beak with saw-like edges is an adaptation in
Sagot
(C)
pelican
112
The zone in an ecosystem that provides habitat for living organism is referred to as
Sagot
(C)
biosphere
113
An example of application of variation is
Sagot
(A)
paternity determination
114
The level of organization in onion bulb is
Sagot
(D)
organ
115
The type of germination in which the cotyledons remain below the soil surface is
Sagot
(C)
hypogeal