POST UTME MADONNA UNIVERSITY 2018 Biology | Objective

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Question 1
A plant's xylem is responsible for transporting water and minerals from the roots to the leaves. What is the primary mechanism by which this transport occurs?
A. Transpiration pull
B. Root pressure
C. Capillary action
D. Osmosis
Question 2
In the context of evolutionary theory, what is the primary mechanism by which species adapt to their environment?
A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation
Question 3
Which of the following is an example of a homo\logous structure?
A. The forelimbs of vertebrates
B. The wings of birds and insects
C. The eyes of vertebrates
D. The fins of fish
Question 4
A researcher is studying the growth of a population of bacteria. The population size is modeled by the equation ( P(t) = P_0 e^{kt} ). What is the doubling time of the population?
A. t = ln(2)/k
B. t = ln(2)/P_0
C. t = ln(2)/kP_0
D. t = k/ln(2)
Question 5
What is the primary function of the excretory system in humans?
A. To regulate body temperature
B. To remove waste products from the body
C. To maintain fluid balance
D. To produce hormones
Question 6
The process by which an organism reproduces without the involvement of gametes is called
A. Mitosis
B. Meiosis
C. Budding
D. Binary Fission
Question 7
A diagram of a plant cell is shown below. Which of the following organelles is responsible for protein synthesis?
A. Nucleus
B. Ribosome
C. Mitochondria
D. Endoplasmic reticulum
Question 8
In the context of respiration, what is the primary function of the mitochondria in the cell?
A. To produce ATP through the process of cellular respiration
B. To synthesize glu\cose from non-carbohydrate sources
C. To break down proteins into amino acids
D. To store energy in the form of glycogen
Question 9
What is the primary function of the xylem in plants?
A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the roots
C. To support the structure of the plant
D. To store food and water
Question 10
The process of osmoregulation in plants involves the movement of water and ions across the plasma membrane. Which of the following is a key player in this process?
A. Aquaporins
B. Proton pumps
C. Ion channels
D. ATPases
Question 11
The process of osmoregulation in an organism involves the regulation of water and electrolyte balance. What is the primary mechanism by which an organism regulates its water balance?
A. Through the process of excretion
B. Through the process of absorption
C. Through the process of diffusion
D. Through the process of osmosis
Question 12
A population of Drosophila melanogaster is being studied for its genetic variation. Which of the following genetic principles best explains the observed variation in wing shape?
A. Genetic drift
B. Gene flow
C. Mutation
D. Natural selection
Question 13
The process by which plants convert light energy into chemical energy is called
A. Respiration
B. Photosynthesis
C. Decomposition
D. Fermentation
Question 14
A diagram of a human eye is shown below. Which of the following parts of the eye is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 15
The growth and development of plants are influenced by various factors, including light, temperature, and water. Which of the following is a key player in plant growth and development?
A. Hormones
B. Nutrients
C. Water
D. Light

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