JAMB - Biology (2025)

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

The structure labelled I is adapted for
答え
(D)
sucking
4
A complex feeding relationship between organisms in a habitat that involves transfer of energy in form of food is
答え
(A)
food web
5
One of the characteristics of insect pollinated flowers is
答え
(C)
scented flowers
6
The process by which plants absorb water from the soil through their roots is
答え
(C)
osmosis
7
The bright colouration of the flower of a flowering plant is an adaptation for
答え
(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
答え
(C)
pituitary
9
One of the components of peripheral nervous system is
答え
(D)
sensory neurones
10
When the cotyledons appear above the soil during germination is called
答え
(B)
epigeal
11
The type of teeth used for tearing in man is labelled
答え
(D)
II
12
Which of these animals create their natural habitats in burrows?
答え
(A)
Bush rat
13
The green-brown colour of grasshopper's body in dry grass field is an adaptation for
答え
(A)
camouflage
14
Which of the following is an advantage of cross fertilization?
答え
(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
答え
(C)
comparative anatomy
16
Example of animal exhibiting mating colouration is
答え
(A)
agama lizard
17
Which of the following is the excretory organ in birds?
答え
(B)
kidneys
18
Whose theory of evolution supports that characters acquired through use or disuse are transmitted to offspring?
答え
(D)
Larmark
19
The most suitable soil for crops cultivation in Nigeria is
答え
(B)
loamy
20
When calyx of a flower is joined together, it is called
答え
(A)
gamosepalous
21
Which of the following statements about poliomyelitis is correct?
答え
(D)
It is capable for paralysing the limbs.
22
What is the phenotype of the offspring produced in F\(_1\)?
答え
(D)
Heterozygous tall
23
The cortex of a herbaceous stem is made up of
答え
(D)
parenchyma and collenchyma
24
The most advanced spermatophyte that forms the largest group of plant kingdom is the
答え
(B)
angiosperm
25
Which of the following is a medium of transportation in animal cells?
答え
(D)
Blood
26
The part labelled I is the
答え
(D)
nucleus
27
Which of these is an estuarine habitat?
答え
(A)
Lagoon
28
The mouth parts of a grasshopper are adapted for
答え
(C)
biting and chewing
29
The following are factors that affect the population growth of an organism except
答え
(C)
natality
30
In ecological succession, the final stable community is called
答え
(A)
climax
31
The innermost layer of mammalian epidermis is
答え
(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?
答え
(A)
\(\frac{1}{2}\)
33
The structure that helps in the formation of cilia and flagella is
答え
(B)
centriole
34
The vertebrate bone responsible for the attachment of the abdominal muscles is
答え
(C)
lumber
35
The canine teeth are prominent in which group of animals?
答え
(A)
Carnivores
36
Translocation of manufactured food in plants is through the
答え
(B)
phloem cells
37
The most advanced organism in an evolutionary trend among the following is
答え
(C)
earthworm
38
One of the following adapts baobab tree to savanna habitat.
答え
(D)
Presence of thick bark
39
Albinism is a disorder caused by
答え
(C)
recessive genes
40
An example of a reflex action is
答え
(C)
coughing
41
Which of the following is an example of vestigial structure?
答え
(B)
Human appendix
42
The correct base pair in DNA molecule is
答え
(D)
adenine - thymine
43
Population replacement among species of organisms in a given habitat under competition is due to
答え
(C)
natural selection
44
Appendix in humans and caecum in herbivores are evidences of evolution from
答え
(A)
vestigial organ
45
A form of adaptive colouration that helps animals to remain unnoticed is
答え
(D)
countershading
46
Genetically Modified Organisms (GMO) food products are of benefit to farmers because they are
答え
(A)
resistant crop varieties
47
The variation that can be applied in crime detection is
答え
(D)
fingerprints
48
The date palm is commonly planted in Sahel zone of
答え
(B)
Borno
49
The region of a flower stalk attached to flower parts is
答え
(D)
receptacle
50
Which of the following processes takes place in the carbon cycle?
答え
(A)
Combustion
51
An instrument used in measuring plants growth is
答え
(B)
auxanometer
52
Chlamydomonas belongs to the phylum
答え
(B)
protophyta
53
The part of the flower that is brightly coloured and attract pollinating agents such as insects is labelled
答え
(A)
III
54
Which of the following blood groups will clump when mixed with anti-a antibody serum?
答え
(A)
A and AB
55
Which of these is the correct arrangement of tissues in herbaceous roots from the circumference to the center?
答え
(A)
piliferous layer, cortex, pericycle, vascular tissue and pith
56
The part labelled I is the
答え
(C)
shell
57
The function of the organelle labelled II is to
答え
(D)
coordinate the activities of the cell
58
The cell component that stores waste products is the
答え
(C)
vacuoles
59
Which of these plants is considered to be common in an estuarine habitat?
答え
(D)
Mangrove
60
Renal artery branches and divides into a mass of blood capillaries in the Bowman's capsule called
答え
(C)
glomerulus
61
Glucose → ethanol + CO\(_2\)

The chemical reaction above represents the process of
答え
(B)
fermentation
62
Agglutination occurs in blood transfusion when the
答え
(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
答え
(A)
splash zone
64
Which of the following differentiates photosynthesis from respiration?
答え
(B)
Oxygen is usually liberated.
65
Use the diagram above to answer the questions that follow

The part labelled II is the
答え
(A)
Liver
66
In which state of Nigeria is Obudu game reserve located?
答え
(A)
Cross Rivers
67
In Nigeria, the major climatic factor that determines the distribution of organisms is
答え
(D)
rainfall
68
The slender and stick-like shapes of the stick insect is a structural adaptation for
答え
(C)
protection and defense
69
In a community with limited resources, the less vigorous species are eliminated due to
答え
(C)
competition
70
Which of the following statements is correct about sedimentation of a given soil?
答え
(A)
Decaying organic matter remains afloat.
71
Which of the following exists at the organ level of organization?
答え
(C)
Onion bulb
72
The organization that provides emergency needs of children globally is
答え
(A)
UNICEF
73
A repeating unit of a very large DNA molecule is made up of
答え
(C)
nucleotides
74
Which of the following is an effect of carbon monoxide on humans?
答え
(B)
Reducing oxygen carrying capacity of blood
75
The constantly dividing cells found at the apex of roots and stem during growth is
答え
(B)
apical
76
Macronutrients required by plants include
答え
(D)
Calcium
77
The longest single bone in human is the
答え
(C)
femur
78
One characteristic which differentiates bats from birds is that bats
答え
(D)
possess mammary glands
79
The part labelled II is the
答え
(C)
uterus
80
The biological association between bacteria and protozoa in the rumen of cattle is an example of
答え
(A)
symbiosis
81
In which of the following organisms does niche differentiation serve as a means of reducing intraspecific competition?
答え
(C)
Tilapia
82
Seaweeds and Barnacles are common flora and fauna found in which of these habitats?
答え
(D)
Marine
83
Competition between cow and goat for scarce grasses during dry season can be described as
答え
(C)
interspecific
84
The oxygen transported to all parts of the body during blood circulation is used for the
答え
(D)
release of energy from food
85
The presence of tiny, non-functional hind leg bones inside a whale's body suggests that whales
答え
(B)
evolved from ancestors that had legs
86
The genetic make up of an organism is referred to as the
答え
(D)
genotype
87
The ability of chameleon to change its colour to that of the environment is for
答え
(C)
defence
88
One of the following is a reflex action
答え
(A)
sneezing
89
Proteins are macromolecules made of smaller units called
答え
(D)
amino acids
90
Transparency of water is measured using a
答え
(C)
secchi disc
91
The maximum number of organisms that the resources in the habitat can support is referred to as
答え
(C)
carrying capacity
92
Desert plants are usually called
答え
(D)
xerophytes
93
An example of a plant whose flower is dispersed by wind is
答え
(D)
cypsela
94
An example of a saprophytic organism is
答え
(A)
rhizopus
95
Absorption of nutrients in ferns is through
答え
(D)
rhizome
96
Which of these insects has a piercing and sucking mouthpart?
答え
(A)
mosquito
97
The segregation of genes occurs during
答え
(A)
gamete formation
98
Which of the following is a behavioural adaptation of animals for avoiding adverse weather conditions?
答え
(C)
Hibernation
99
A medium of transportation of materials in plants is the
答え
(C)
cell sap
100
The artery that carries blood to the heart is
答え
(A)
coronary
101
The blood vessel that takes away deoxygenated blood from the kidney is
答え
(A)
renal vein
102
The relationship between fungus and alga in lichen is an example of
答え
(B)
mutualism
103
The digestive enzyme pepsin is active in
答え
(C)
acidic medium
104
One of the following is an epidemic diseases in Nigeria
答え
(D)
cholera
105
The two - hoofed toes of camels allow easy walking on desert because of
答え
(B)
enlarged foot surface
106
Which of these animals uses buccal respiration?
答え
(A)
Toad
107
The prevalence of pests and diseases which affect plants and animals in a terrestrial habitat is
答え
(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
答え
(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?
答え
(D)
1 : 2: 1
110
A structure associated with an open circulatory system is
答え
(D)
haemocoel
111
Long beak with saw-like edges is an adaptation in
答え
(C)
pelican
112
The zone in an ecosystem that provides habitat for living organism is referred to as
答え
(C)
biosphere
113
An example of application of variation is
答え
(A)
paternity determination
114
The level of organization in onion bulb is
答え
(D)
organ
115
The type of germination in which the cotyledons remain below the soil surface is
答え
(C)
hypogeal