Biology JAMB CBT Practice Questions & Answers 2021 SET 1

  

Biology JAMB CBT Practice Questions & Answers 2021 SET 1

1.A group of closely related organisms capable of interbreeding to produce the fertile offspring are known as members of a

A. Kingdom
B. class
C. family
D. species

Correct Answer: Option D
Explanation

Species could be likened to offspring or heredity of a lineage. Hence, they are alike


2. A beaker of pond water containing few specimens of Euglena was placed in a dark room for two weeks. At the end of this period, the specimens of Euglena were still alive because they were

A. able to carry out holozoic nutrition
B. able to carry out photosynthesis using carbon dioxide in the pond water
C. better adapted to life in darkness than to life in light
D. not overcrowded

Correct Answer: Option A


3.The cytoplasm of a cell is considered a very important component because it
A. regulates the amount of energy in the cell
B. suspends all cell organelles
C. is the outermost part of the cell
D. is solely responsible for cell division

Correct Answer: Option B


4





Use the diagram shown to answer the question. After an hour, the level of water in the thistle funnel will
A. rise
B. fall
C. remain the same
D. double


Correct Answer: Option A


5





Use the diagram shown to answer the question. The experiment above is used to demonstrate the process of
A. transportation
B. water culture
C. diffusion
D. osmosis

Correct Answer: Option D






6





Use the diagram shown to answer the question. In plant cells, the role of the membrane is played by the
A. nucleolus
B. cell wall
C. cytoplasm
D. mitochondrion

Correct Answer: Option B


7. Red blood cells were found to have burst open after being placed in distill for an hour. This phenomenon is known as

A. plasmolysis
B. diffusion
C. haemolysis
D. wilting

Correct Answer: Option C


8.The curvature movement of plants in response to the stimulus of water is called

A. hydrotropism
B. geotropism
C. Phototropism
D. thigmotropism

Correct Answer: Option A


9.The overall reaction in glycolysis can be summarised as

A. CHO -----> CHO+ 4H + ATP

B. CHO -----> 2CHO+ 4H + 2ATP
C. CHO -----> 2CHO+ 4H + ADP
D. CHO -----> 2CHO+ 4H + 2ADP



Correct Answer: Option B


10.The longest bone in the body is the
A. humerous
B. femur
C. scapula
D. tibia

Correct Answer: Option B


11. Which of the following structures is not a skeletal material?

A. Chitin
B. Cartilage
C. Bone
D. Muscle

Correct Answer: Option D


12. The reason why the flow of blood through the capillaries is very slow is

A. because the walls of Capillaries are very thin
B. to avoid high blood pressure
C. to ensure that the individual does not get dizzy
D. to allow adequate time for exchange of materials

Correct Answer: Option D


13.Which of the following groups of organisms has kidney as the excretory organ?

A. Fishes, amphibians, birds, man
B. Fishes, amphibians, annelids, insects
C. Fishes, reptiles, birds, tapeworm
D. Fishes, protozoans, amphibians, man

Correct Answer: Option A


14.Which of the following features is not a characteristic of arteries? Arteries

A. possess valves at internals throughout their length
B. have thick muscular and elastic walls
C. carry blood away from the heart
D. transport oxygenated blood with the exception of the pulmonary artery

Correct Answer: Option A



15





The graph below shows the results of a laboratory investigation which measured the body temperatures of a lizard and a bird under changing artificial conditions. Use it to answer the question.

Which of the statements below is valid?
A. The bird's blood was always warmer than that of the lizard
B. The body temperature of the bird varied less than that of the lizard during changes in environmental temperature
C. The body temperature of the bird remained constant despite changes in environmental temperature
D. The body temperature of the lizard was always close to that of the environmental temperature

Correct Answer: Option C




16





The graph below shows the results of a laboratory investigation which measured the body temperatures of a lizard and a bird under changing artificial conditions. Use it to answer the question.

What physiological term can used to describe the regulation of the body temperature of the of the Lizard?
A. Homeostasis
B. Homoithermy
C. Poikilothermy
D. Osmoregulation

Correct Answer: Option C


17. The reason why hospitals use saline solutions as drip Instead of water is

A. because salt is a preservative
B. to prevent contamination of the body
C. to maintain the composition of body fluids
D. to increase the number of blood cells

Correct Answer: Option C


18.The part of the ear which contains nerve cells sensitive to sound vibrations is the

A. cochlea
B. ampulla
C. tympanum
D. malleus

Correct Answer: Option A


19. Spectacles with convex lenses correct long-sightedness by

A. converging the light rays before they enter the eye
B. diverging the light rays before they enter the eye
C. reducing the light intensity before it enters the eye
D. increasing the light intensity before it enters the eye

Correct Answer: Option A


20. A seed of a flowering plant can best be described as
A. radicle and plumule
B. the developed ovule
C. the embryo and endosperm
D. developed ovary

Correct Answer: Option B


21. Which of the following processes removes carbon from the atmosphere?

A. putrefaction
B. photosynthesis
C. volcanic eruption
D. burning of fuels

Correct Answer: Option B


22. Which of the following cycles involves the process of precipitation and transpiration?

A. water cycles
B. carbon cycle
C. nitrogen cycle
D. oxygen cycle

Correct Answer: Option A


23. What is the critical limiting factor for plants below the photic zone in an aquatic ecosystem?
A. availability of nutrients
B. availability of water
C. intensity of light
D. carbon dioxide concentration

Correct Answer: Option C


24. Which of the following instruments is used to estimate the number of plants in a habitat?

A. pooter
B. pitfall trap
C. quadrant
D. sweep net

Correct Answer: Option C


25. Which of the following statements is true about sandy soil?
A. has limited air space
B. is light and easy to dig
C. drains slowly
D. is heavy and poorly aerated

Correct Answer: Option B