JAMB BIOLOGY Questions 2020 | Jamb Biology Repeated Questions

JAMB Biology Questions for 2020/2021 Examination.

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The Joint Admissions and Matriculations Board is a Nigerian entrance examination board for tertiary-level institutions. The board conducts entrance Unified Tertiary Matriculation Examination for prospective undergraduates into Nigerian universities.

JAMB BIOLOGY Questions 2020.

OBJECTIVES

1. A noticeable adaptation of the animal to its aquatic habitat is the possession of
A. webbed digits B. four limbs C. a wide mouth D. large eyes

2. The similarity among organisms belonging to the same group will be least within each
A. order B. family C. species D. kingdom

3. Hermaphroditic reproduction can be found among the
A. annelids and molluscs B. pisces and amphibians C. coelenterates and platyhelminthes D. arthropods and nematodes

4. One distinctive feature in the life history of liverworts is that they exhibit
A. vegetative reproduction B. alternation of generation C. sexual reproduction D.asexual reproduction

5. The cell component that is present in a prokaryotic cell is the
A. ribosome B. mitochondrion C. chloroplast D. nuclear envelope

6. In the egg of a bird, the embryo is located in the
A. yolk B. embryo disc C. chalaza D. albumen

7. An insect whose economic importance is both harmful and benefit is the
A. butterfly B. mosquito C. blackfly D. tsetsefly

8. If water that has been coloured red is poured at the base of a wilting plant, it will appear as a red stain in the cells of the
A. phloem B. parenchyma C. xylem D. epidermis.

9. The stunted growth of a leguminous plant suffering from nitrogen deficiency may be corrected by inoculating the soil with
A. saprophytic bacteria B. rhizobium C. denitrifying bacteria D. nitrosomonas.

10. The part of the mammalian digestive system where absorption of nutrients takes place is the. A. duodenum B. colon C. ileum D. oesophagus

11. The dark reaction of photosynthesis involves the
A. release of oxygen and the splitting of water, B. photolysis of water and the production of starch, C. reduction of carbon (IV) oxide to organic compounds, D. splitting of water into hydrogen ions

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12. The most important hormone that induces the ripening of fruit is
A. Cytokinin B. Indole acetic acid C. Ethylene D. Gibberellin

13. Metabolic production of urea is carried out in the
A. urinary bladder and kidney B. pancreas C. kidney and malphigian tubule D. liver

14. In mammalian males, the excretory and reproductive system share the
A. ureter B. testes C. vas deferens D. urethra

15. The best method of propagating sugarcane is by
A. stem cuttings B. seed sowing C. layering D. grafting

16. The response of plants to external stimuli in a non-
directional manner is known as
A. nastic movement B. photropism C. tactic D. geotropism

17. Homologous pairs of chromosomes separate during
A. meiosis B. cytolysis C. mitosis D. cleavage

18. An example of a caryopsis is
A. coconut B. tomato C. guava D. maize grain

19. A limiting factor in a plant population near a chemical factory is likely to be
A. humidity B. pH C. wind D. light

20. The pioneer organisms in ecological succession are usually the
A. lichens B. algae C. ferns D. mosses

21. Mycorrhiza is an association between fungi and
A. roots of higher plants B. ilamentous algae C. bacteria D. protozoans

22. A density-dependent factor that regulates the population size of organisms is
A. sudden flood B. disease C. fire outbreak D. drought

23. The most effective method of dealing with non-biodegradable pollution is by
A. burying B. dumping C. incineration D. recycling

24. Soil fertility can best be conserved and renewed by the activities of
A. microbes B. earthwormsv C. man D. rodents

25. One example of fossil fuels is
A. coral B. limestone C. firewood D. coal

26. If the pair of allelels for baldness is given as Bb, a female carrier will be denoted by
A. XBXb B. XBXB C. XbY D. XBY

27. An organism that has been extensively used to test the chromosome theory of heredity is
A. Homo sapiens B. Drosophila melanogaster C. Zea Mays D. Musea domestica

30. A feature associated with the Y-chromosome in humans is
A. facial hairs B. prominent fingernails C. long eyelashes D. enlarged breast

31. A man and his wife are both heterozygous for the sickle-cell trait. The likely percentage of their offspring that will be either carriers or sicklers is
A. 50% B. 25% C. 75% D. 100%

32. The type of reproduction that leeds to variation in animal and plant populations is
A. budding B. vegetative C. asexual D. sexual

33. If a DNA strand has a base sequence TCA, its complementary strand must be
A. ATG B. GAT C. AGT D. TAG

34. Which of the following requires the use of carbon dating to prove that evolution has occurred?
A. Biochemical similarities B. Molecular records C. Fossil Records D. Comparative anatomy

35. The presence of sunken stomata and the folding of leaves are adaptations to
A. prevent entry of pathogens B. prevent guttation C. remove excess water D. reduce water loss

36. Spines and shells on animals are adaptations for
A. physical defence B. camouflage C. chemical defence D. mimicry

37. The inactive state exhibited by an animal during hot dry seasons is termed
A. aestivation B. dormancy C. resting D. hibernation

38. An insect with a mandibulate mouth part will obtain its food by
A. chewing B. chewing and sucking C. sucking D. biting and chewing

39. An example of cryptic colouration is the
A.bright marks on a poisonous tropical frog on variegated leaves
B. bright colour of an insect-pollinated flower
C. mottled colours on moths that rest on lichens
D. green colour of a plant

40. An argument against Lamarck’s heory of evolution is that
A. acquired traits cannot be passed onto the offspring
B. disuse of body part cannot weaken the part
C. disused part is dropped off in the offspring
D. traits cannot be acquired through constant use of body parts.

41. The type of reproduction that is common to both Hydra and yeast is
A. grafting B. budding C. conjugation D. binary fission

42. Epigeal germination of a seed is characterized by
A. lack of growth of the hypocotyls
B. more rapid elongation of the hypocotyls than the epicotyl
C. more rapid elongation of the epicotyl than the hypocotyl
D. equal growth rate of both the .hypocotyl and epicotyl.

43. All living cells require water because it
A. is a medium that neutralizes acids in cells
B. is the main source of energy for the cells
C. prevents the development of diseases in cell
D. is a medium for all metabolic reactions.

44. The surface of an alveolus in a mammals is well supplied
with tiny blood vessels known as
A. capillaries B. arteries C. arterioles D. venules

45. Nervous control differs from hormonal control in that the former
A. is a slower process
B. involves only chemical transmission
C. has no specific pathway
D. produces short-term changes

46. Identical twins inherit their genes from
A. One egg and two sperms B. two eggs and a sperm C. the same egg and sperm D. different eggs and sperms

47. Paternity disputes can most accurately be resolved through the use of
A. DNA analysis B. fingerprinting C. tongue-rolling D. blood group typing

48. Sex-linked genes are located on
A. X-and Y-chromosomes B. homologous chromosomes C. X- chromosomes D. Y- chromosome.

49. In a Mendelian cross of red and white varieties of the four o’clock plant, the Fgeneration expresses incomplete dominance by having flowers which are
A. multicoloured B. pink C. red D. white

50. Insects are considered the most successful among the Invertebrates because they
A. survive in various environmental conditions B. possess the ability to change their forms C. possess exoskeletons D. have wing for flight.

JAMB BIOLOGY QUESTIONS TODAY 2020…

1 :- movement of manufactured food from the leaves to other part of the plant is
CORRECT ANSWER =
translocation
2 :- the part where fertilization takes place is labelled
CORRECT ANSWER =
III
3 :- the level of organization in onion bulb is
CORRECT ANSWER =
organ
4 :- the possession of short string and conical beak for picking and cracking seed is an adaptive feature of
CORRECT ANSWER =
weaver bird
5 :- gaseous exchange in plants takes place through the
CORRECT ANSWER =
stomata
6 :- the part labelled ii is the
CORRECT ANSWER =
suture
7 :- predominance of grasses with scattered trees are characteristics features of
CORRECT ANSWER =
grassland
8 :- in plants, auxin is produced in the
CORRECT ANSWER =
apices
9 :- the blood group AB is called
CORRECT ANSWER =
universal acceptor
10 :- a diploid individual carrying two different alleles if a gene on its two homologous chrosomes is referred to as
CORRECT ANSWER =
heterozygote
11 :- photosynthesis, respiration and decay are important processes which brings about the recycling of
CORRECT ANSWER =
carbon(iv)oxide
12 :- the illustration represents
CORRECT ANSWER =
mitosis
13 :- which of the following structural feature is involved in regulating heat loss from the body
CORRECT ANSWER =
body size and shape
14 :- dissolved gasses, turbidity and density are ecological that affect
CORRECT ANSWER =
aquatic habitat
15 :- under secretion of pituatry hormones in children leasd to
CORRECT ANSWER =
dwarfism
16 :- the law of the inheritance of acquired traits was postulated by
CORRECT ANSWER =
lamarck
17 :- a trait that is expressed in an offspring when two individuals with constracting characters are crossed is
CORRECT ANSWER =
dorminant
18 :- which of the following is a biotic factor in an ecosystem
CORRECT ANSWER =
predation
19 :- organis that belongs to the kingdom protista are referred to as
CORRECT ANSWER =
eukaryotes
20 :- which of the following is a decomposer in a terrestial habitat?
CORRECT ANSWER =
bacteria
21 :- which of the following air pollutant results in acid rain
CORRECT ANSWER =
nitrogen oxide
22 :- which of the following features describes Euglena as a plant and an animal
CORRECT ANSWER =
ability to response to light stimulus
23 :- the function of swim blader in Tilapia fish is
CORRECT ANSWER =
for buoyancy
24 :- the causative organism of ameobic dysentry is
CORRECT ANSWER =
entamoeba hystolytica
25 :- a person with blood AB can donates to person with blood group
CORRECT ANSWER =
AB
26 :- the genetic constitution of an organism is referred to as its
CORRECT ANSWER =
genotype
27 :- the diagram represents a
CORRECT ANSWER =
hibiscus flower
28 :- the diagram labelled ii is
CORRECT ANSWER =
metaphase
29 :- in evolution the appendix in humans is an evidence from
CORRECT ANSWER =
vestigial organ
30 :- secondary succesion takes place
CORRECT ANSWER =
in abondoned farmland
31 :- the level of organization of a cow heart is
CORRECT ANSWER =
organ
32 :- a sudden loss of black pigment from the skin of an African can be attributed to
CORRECT ANSWER =
mutation in the skin cell
33 :- intra specific competition occur due to
CORRECT ANSWER =
limited resources
34 :- in which part of the body can the diagram be found
CORRECT ANSWER =
neck region
35 :- the characteristics feature of trachepphyta is that they
CORRECT ANSWER =
are vascularized
36 :- Borgu game ireserve is located in
CORRECT ANSWER =
Niger state
37 :- the function of the part labelled I is for
CORRECT ANSWER =
protection
38 :- the part labelled ii is the
CORRECT ANSWER =
neural canal
39 :- an area very low rainfall and high evaporation rate is referred to as
CORRECT ANSWER =
savanna
40 :- ammonification takes place in
CORRECT ANSWER =

both aerobic and anaerobic

ANSWERS

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