POST UTME BABCOCK UNIVERSITY 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In asexual reproduction, what is the primary mechanism by which genetic variation is introduced into a population?
A. Mutation
B. Gene flow
C. Genetic drift
D. Genetic recombination
Question 2
In the xylem transport system, what is the primary function of the xylem parenchyma cells?
A. To transport water and minerals from the roots to the leaves
B. To store food and water for the plant
C. To provide structural support to the plant
D. To produce hormones that regulate plant growth
Question 3
What is the term for the movement of water from the roots to the leaves of a plant?
A. Transpiration
B. Translocation
C. Osmosis
D. Diffusion
Question 4
A population of rabbits is introduced to a new island. Over time, the population grows exponentially. Which of the following mathematical models best describes this growth?
A. Exponential growth model: N(t) = N0 * e^(kt)
B. Logistic growth model: N(t) = N0 / \( 1 + Ae^\( -kt \ \))
C. Linear growth model: N(t) = N0 + kt
D. Sigmoid growth model: N(t) = N0 / \( 1 + e^\( -kt \ \))
Question 5
In the context of evolutionary theory, what is the primary mechanism by which genetic drift acts on a population?
A. Mutation
B. Gene flow
C. Genetic drift
D. Natural selection
Question 6
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
A. Nucleus
B. Mitochondria
C. Chloroplast
D. Vacuole
Question 7
A species of bird has a beak shape that is adapted for cracking open nuts. What is the likely selective pressure driving this adaptation?
A. Predation pressure
B. Competition for food
C. Climate change
D. Availability of nuts
Question 8
In the nervous system, what is the primary function of the synapse?
A. To transmit nerve impulses from one neuron to another
B. To store nerve impulses for later use
C. To provide structural support to the neuron
D. To produce hormones that regulate body functions
Question 9
In the process of photosynthesis, what is the role of the enzyme RuBisCO in the Calvin cycle?
A. It catalyzes the conversion of CO2 into a 3-carbon molecule.
B. It is responsible for the regeneration of RuBP.
C. It is involved in the light-dep\endent reactions.
D. It is a key enzyme in the light-indep\endent reactions.
Question 10
What is the process by which an organism's genetic information is passed from one generation to the next?
A. Mutation.
B. Genetic drift.
C. Natural selection.
D. Heredity.
Question 11
In the process of growth and regulation, what is the primary function of the auxin hormone?
A. To promote cell elongation and cell division
B. To inhibit cell growth and cell division
C. To regulate stomatal opening and clo\sing
D. To produce flowers and fruits
Question 12
Which of the following is a characteristic of a prokaryotic cell?
A. Presence of a true nucleus.
B. Presence of mitochondria.
C. Lack of a true nucleus.
D. Presence of a cell wall.
Question 13
A patient is diagnosed with a bacterial infection caused by a gram-negative bacterium. Which of the following antibiotics would be most effective in treating this infection?
A. Penicillin
B. Ciprofloxacin
C. Vancomycin
D. Metronidazole
Question 14
In the human digestive system, what is the primary function of the pancreas?
A. Production of bile.
B. Production of digestive enzymes.
C. Absorption of nutrients.
D. Storage of food and water.
Question 15
A diagram of the human eye is shown below. Identify the part labeled 'A'?
A. Cornea
B. Iris
C. Retina
D. Lens

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