Practice post utme rsu biology 2018 Past Questions

Question 1

A plant has a root system that consists of a taproot and a lateral root system. The taproot is 10 cm long and the lateral roots are 5 cm long. If the plant is placed in a solution with a concentration of 0.1 M sucrose, what is the rate of sucrose uptake by the lateral roots?

A. 0.5 mmol/s

B. 1.0 mmol/s

C. 1.5 mmol/s

D. 2.0 mmol/s

Question 2

In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?

A. 0.64

B. 0.36

C. 0.16

D. 0.04

Question 3

In the human body, what is the primary function of the xylem in the vascular system?

A. To transport water and minerals from the roots to the leaves

B. To transport glu\cose and amino acids from the leaves to the roots

C. To provide structural support to the plant

D. To regulate the plant's water potential

Question 4

A diagram of the human digestive system is shown below. Identify the structure labeled B.

A. Esophagus

B. Stomach

C. Duodenum

D. Jejunum

Question 5

In a population of 1000 individuals, 60% are heterozygous for the ABO blood group system. If 20% of the population is type A, 40% is type B, and 40% is type AB, what is the genotype of the individual who is type AB?

A. IAi

B. IBi

C. IAIB

D. IAiB

Question 6

In the context of excretion and osmoregulation, what is the primary function of the kidneys in maintaining homeostasis?

A. To regulate blood pH levels

B. To remove waste products from the body

C. To maintain water balance in the body

D. To regulate electrolyte balance

Question 7

In the human body, what is the primary function of the blood in the circulatory system?

A. To transport oxygen and nutrients to the cells

B. To transport waste products and carbon dioxide away from the cells

C. To regulate the body's temperature

D. To provide structural support to the body

Question 8

A person is experiencing respiratory distress due to a severe asthma attack. Which of the following is a primary function of the alveoli in the lungs?

A. Gas exchange

B. Filtering of blood

C. Production of surfac\tant

D. Regulation of pH

Question 9

The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?

A. Random mating

B. No mutation

C. No gene flow

D. No natural selection

Question 10

In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?

A. 0.64

B. 0.36

C. 0.16

D. 0.84

Question 11

In a random sample of 1000 people, 250 are left-handed. What is the probability of randomly selecting a left-handed person?

A. 0.25

B. 0.3

C. 0.35

D. 0.4

Question 12

A plant has a genotype of 'Rr' for the flower color gene. If the plant is crossed with a plant having the genotype 'RR', what is the probability that the offspring will have the genotype 'RR'?

A. 0.5

B. 0.25

C. 0.75

D. 0.33

Question 13

In the process of cellular respiration, what is the primary function of the electron transport chain?

A. To generate ATP through substrate-level phosphorylation

B. To pump protons across the mitochondrial membrane

C. To produce NADH and FADH2

D. To reduce oxygen to water

Question 14

A 2.5 L solution of 0.1 M NaCl is diluted to 5 L. What is the new concentration of NaCl?

A. 0.02 M

B. 0.04 M

C. 0.05 M

D. 0.1 M

Question 15

A patient has a fever of 38.5°C. If the normal body temperature is 37°C, what is the percentage increase in body temperature?

A. 2%

B. 4%

C. 6%

D. 8%

POST UTME RSU 2018 Biology | Objective

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