POST UTME OSUSTECH 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 cm long stem of a plant is cut and placed in a test tube containing 20 ml of water. The stem is then placed in a warm place. After 24 hours, the stem has grown to 4.2 cm. Calculate the rate of elongation of the stem.
A. 0.05 cm/h
B. 0.1 cm/h
C. 0.15 cm/h
D. 0.2 cm/h
Question 2
What is the role of the mitochondria in cellular respiration?
A. The mitochondria is responsible for the breakdown of glu\cose to produce ATP
B. The mitochondria is responsible for the synthesis of ATP from glu\cose
C. The mitochondria is responsible for the breakdown of proteins to produce ATP
D. The mitochondria is responsible for the breakdown of fats to produce ATP
Question 3
A diagram of the human eye is shown below. What is the function of the structure labeled 'Y'?
A. B\ending of light rays
B. Detection of light
C. Regulation of light entry
D. Focus of light
E. Transmission of visual signals
Question 4
What is the primary function of the pancreas in the human body?
A. To produce hormones to regulate blood sugar levels
B. To produce digestive enzymes to break down food
C. To produce insulin to regulate blood pressure
D. To produce glucagon to regulate blood sugar levels
Question 5
A diagram of the human eye is shown below.
A. The cornea is the transparent part of the eye.
B. The iris is the colored part of the eye.
C. The retina is the light-sensitive tissue at the back of the eye.
D. The lens is the flexible part of the eye that changes shape to focus light.
Question 6
A plant grows from a seedling to a mature plant in 30 days. If the growth rate is proportional to the square root of the plant's height, and the initial height is 10 cm, what is the height of the plant after 20 days?
A. 20 cm
B. 30 cm
C. 40 cm
D. 50 cm
Question 7
A cell in a plant root hair is shown below. What is the function of the structure labeled 'X'?
A. Storage of water and salts
B. Site of protein synthesis
C. Regulation of cell growth
D. Transport of nutrients
E. Maintenance of cell shape
Question 8
What is the primary mechanism of gas exchange in plants?
A. Diffusion through the cell membrane
B. Active transport across the stomata
C. Passive transport through the cuticle
D. Osmosis through the xylem
Question 9
A diagram of a human eye is shown below. Identify the part labeled 'B'.
A. Cornea
B. Iris
C. Retina
D. Lens
Question 10
What is the primary function of the pituitary gland in the human body?
A. To produce hormones to regulate growth and development
B. To produce hormones to regulate metabolism and energy balance
C. To produce hormones to regulate reproductive functions
D. To produce hormones to regulate blood pressure and fluid balance
Question 11
A diagram of the human circulatory system is shown below.
A. The heart is the pump that circulates blood throughout the body.
B. The arteries are the blood vessels that carry oxygenated blood away from the heart.
C. The veins are the blood vessels that carry deoxygenated blood back to the heart.
D. The capillaries are the tiny blood vessels where exchange of oxygen and nutrients occurs.
Question 12
A population of 1000 individuals has a mean height of 170 cm and a s\tandard deviation of 10 cm. If a random sample of 50 individuals is taken, what is the probability that the sample mean height is greater than 175 cm?
A. 0.05
B. 0.01
C. 0.005
D. 0.0005
Question 13
What is the primary function of the epidermis in plants?
A. To produce roots and stems
B. To produce leaves and flowers
C. To protect the plant from pathogens and pests
D. To regulate water and nutrient uptake
Question 14
In the cell cycle, what is the primary function of the G2 phase?
A. DNA replication
B. Mitosis
C. Interphase
D. Synthesis of organelles
Question 15
A bacterium has a mutation that causes it to produce a toxin that is lethal to humans. If the bacterium has a doubling time of 30 minutes and a population growth rate of 0.5 per hour, what is the population size after 2 hours?
A. 1.6 x 10^6
B. 3.2 x 10^6
C. 6.4 x 10^6
D. 12.8 x 10^6

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