JAMB - Biology (1990)

• 1

  Viruses are considered to be living organisms because they

  回答

  (A)

  possess transmittable characters
• 2

  Which of the following characteristics is common to Amoeba and Paramecium?

  回答

  (C)

  Contractile vacuole
• 3

  Hydra removes undigested food by

  回答

  (B)

  passing it through the mouth
• 4

  Which of the following groups of invertebrates reproduces by budding?

  回答

  (D)

  Coelenterata
• 5

  The algae, bryophytes and pteridophytes are similar in that they

  回答

  (C)

  require moisture for fertilization
• 6

  The spores of ferns are dispersed by

  回答

  (A)

  wind
• 7

  

  The part labelled 3 is the

  回答

  (C)

  auxillary bud
• 8

  

  Which part of the twig produces auxins?

  回答

  (D)

  1
• 9

  Which of the following animals has homodont dentition?

  回答

  (C)

  Lizard
• 10

  In which of the following does external fertilization takes place?

  回答

  (A)

  Toad
• 11

  In the tapeworm the suckers on the scolex are used for

  回答

  (B)

  holding fast to the host
• 12

  A feature which adapts birds to flight is the possession of

  回答

  (B)

  light bones
• 13

  The nephridia in the earthworm form part of the

  回答

  (D)

  excretory system
• 14

  which of the following disease is rarely spread by a housefly?

  回答

  (A)

  Yellow fever
• 15

  Which type of the following cells is thin-walled and living at maturity?

  回答

  (B)

  Sieve tube
• 16

  The mode of nutrition in which digestion is extracellular is

  回答

  (D)

  saprophytic
• 17

  The first step in the process of photosynthesis is the

  回答

  (A)

  activation of the chlorophyll
• 18

  Which of the following food substance will produce a brick-red colour when warmed with Benedict's solution?

  回答

  (A)

  Glucose
• 19

  The organ which secretes digestive enzymes as well as hormones is the

  回答

  (C)

  pancreas
• 20

  The vilius in the small intestine is significant because it

  回答

  (A)

  increase the surface area for absorption
• 21

  If a ring of bark and phloem is removed from a stem, the

  回答

  (D)

  movement of minerals is hardly affected
• 22

  Transpiration can be measured with a

  回答

  (C)

  potometer
• 23

  Excretory products responsible for the red, purple and blue colours of flowers are called

  回答

  (C)

  anthocyanins
• 24

  Etiolation is caused by the influence of

  回答

  (D)

  light
• 25

  Muscles are indirectly attached to bones by means of

  回答

  (C)

  tendons
• 26

  During mammalian embryo development, large amounts of oestrogen and progesterone are produced in the

  回答

  (C)

  placenta
• 27

  Fruits which develop without fertilization are described as

  回答

  (B)

  pathencorpic
• 28

  

  The type of placentation shown in the figure above is a

  回答

  (A)

  parietal
• 29

  The elephant grass is propagated vegetatively by means of

  回答

  (D)

  stolons
• 30

  The part of the ear that is concerned with balance is the

  回答

  (A)

  semi-circular canals
• 31

  In organism where the 2nd number of chromosomes is 16, the number of chromosomes in each gamete will be

  回答

  (C)

  8
• 32

  What will be the result of the first filial generation (F₁) and the second filial generation (F₂) of a mono-hybrid cross between pure line normal-winged Drosophilia flies and pure line short-winged flies, if the gene for the normal wing is dominant?

  回答

  (D)

  F₁ flies all normal-winged and three-quarters of F₂ flies are normal-winged
• 33

  

  What stage during cell division is represented in the figure above?

  回答

  (C)

  Anaphase
• 34

  An individual in the AB blood group is a universal recipient for blood donation because

  回答

  (D)

  there are no anti-A and anti-B antibodies in the serum
• 35

  Haemophilia results from the mutation of the genes

  回答

  (A)

  in the sex chromosome
• 36

  In a savanna ecosystem the abiotic factors include

  回答

  (B)

  water, temperature and soil
• 37

  

  Which of the following is an omnivore?

  回答

  (C)

  Mouse
• 38

  which of the organisms will have the lowest population in an ecosystem?

  回答

  (A)

  Hawk
• 39

  The salinity of a brackish enviroment

  回答

  (D)

  increase during dry season
• 40

  Physiological adaptation to very dry condition in animals is called

  回答

  (B)

  aestivation
• 41

  Which set of disease is spread mainly by insect vectors?

  回答

  (D)

  Malaria, cholera and river blindness
• 42

  Which of the following constitute pollution?

  回答

  (B)

  loud disco sound
• 43

  An acidic soil can be improved upon by

  回答

  (C)

  flocculation
• 44

  What do bacteria in root nodules derive from the host plant?

  回答

  (A)

  Protection and minerals
• 45

  Free nitrogen is released to the atmosphere by

  回答

  (C)

  denitrifying bacteria