Section B - JAMB CBT - BIOLOGY 1999 (50 Questions)

COMPUTER BASED TEST

JAMB CBT – BIOLOGY 1999(50 - Questions)
Instructions:
a) Each question carries one mark.
b) The questions have been divided into five sections
Section A (1 - 10)
Section B (11 - 20)
Section C (21 - 30)
Section D (31 - 40)
Section E (41 - 50)
c) Each section carries 10 questions and each section is meant to be answered separately.
d) You are advised to check the answers only after attempting the questions.
e) Once you click next, you can't go back, unless you start afresh.
f) You are graded once you click submit.

Section B - Biology 1999

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11. The Key event in the transition of the amphibians from water to land is the

a. Replacement of the gills with lungs
b. Possession of webbed limbs
c. Development of long hind limbs
d. Possession of tympanic membrane

12. In plant cells, the chloroplast are located

a. Inside the cell wall
b. Outside the protoplasm
c. Within the vacuole
d. Within the cytoplasm

13. In woody stems, gaseous exchange takes place through the

a. Micropyles
b. Stomata
c. Lenticles
d. Vessels

14. Substances manufactured by the leaves are transported to other parts of the plant through the

a. Xylem
b. Companion cells
c. Sieve tubes
d. Cambium

15. After a meal of yam has been digested, the highest concentration of glucose is to be found in the

a. Hepatic artery
b. Pulmonary vein
c. Hepatic portal vein
d. Posterior vena cava

16. The dark reaction of photosynthesis involves

a. Fixation of carbon(IV) oxide to give a six- carbon sugar
b. Fixation of carbon(IV) oxide with the help of oxygen
c. Use of carbon(IV) oxide to produce glucose using ATP
d. Fixation of carbon(IV) oxide on chlorophyll using hydrogen

17. Mammals acclimatize to reduce oxygen content at high altitudes by

a. The stimulation of marrow to reduce the amount of erythrocytes produced
b. Increasing the rate at which erythrocytes are destroyed
c. The stimulation of marrow to produce more erythrocytes
d. Increasing the breakdown of the protein portion of the erythrocytes

18. The modes of nutrition in Nitrobacter, Ascaris and Homo sapiens respectively are

a. photosynthetic, parasitic and holozoic
b. chemosynthetic, parasitic and holozoic
c. photosynthetic, parasitic and heterophytic
d. chemosynthetic, holophytic and holozoic

19. The richest sources of vitamin A are

a. Palm oil and groundnut oil
b. Palm oil and carrot
c. Rice and groundnut oil
d. Oranges and carrots

20. The forces that holds water together in the form of a stream within the xylem tube is the

a. Cohesion of water molecules to one another by hydrogen bonds
b. Force of gravity attracting the water molecules through the hydrogen bonds
c. Attraction between the water and xylem by osmotic force
d. Normal flow of water from the ground with the help of gravitational force.

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