Transport System Practice Questions
WAEC (West Africa) · WAEC Biology · 148 free MCQs with instant results and detailed explanations.
148
Total
45
Easy
74
Medium
29
Hard
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Sample Questions from Transport System
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following is the primary function of the xylem in plants?
A.
Transporting water and minerals from the roots to the leaves
B.
Transporting sugars from the leaves to the roots
C.
Storing nutrients for the plant
D.
Providing structural support to the plant
Show Answer & Explanation
Correct Answer: A
The xylem's primary function is to transport water and dissolved minerals from the roots to all parts of the plant, especially the leaves, which is essential for photosynthesis and nutrient uptake.
Q2
Easy
In the human circulatory system, what is the role of capillaries?
A.
To carry oxygenated blood from the heart to the body
B.
To facilitate gas exchange between blood and tissues
C.
To pump blood throughout the body
D.
To transport deoxygenated blood back to the heart
Show Answer & Explanation
Correct Answer: B
Capillaries are tiny blood vessels that connect arteries and veins. Their thin walls allow for the exchange of gases, nutrients, and waste products between blood and surrounding tissues.
Q3
Easy
Which of the following processes is primarily responsible for the movement of water in plants?
A.
Diffusion
B.
Active transport
C.
Transpiration
D.
Osmosis
Show Answer & Explanation
Correct Answer: C
Transpiration is the process through which water evaporates from the leaves of plants, creating a negative pressure that pulls more water up from the roots through the xylem, thus facilitating its movement.
Q4
Medium
Which of the following best describes the primary function of the xylem in plants?
A.
Transport of nutrients from roots to leaves
B.
Transport of water and minerals from roots to leaves
C.
Storage of food produced during photosynthesis
D.
Transport of glucose from leaves to roots
Show Answer & Explanation
Correct Answer: B
The xylem's primary function is to transport water and minerals absorbed by the roots to different parts of the plant, especially the leaves, where photosynthesis occurs.
Q5
Medium
In human beings, which component of blood is primarily responsible for the transport of oxygen?
A.
Plasma
B.
Platelets
C.
White blood cells
D.
Red blood cells
Show Answer & Explanation
Correct Answer: D
Red blood cells contain hemoglobin, which binds to oxygen in the lungs and carries it to tissues throughout the body, making them the primary transporters of oxygen in the blood.
Q6
Medium
What is the main purpose of the stomata in plant leaves?
A.
Absorb water from the soil
B.
Facilitate gas exchange
C.
Store nutrients
D.
Transport sugars to roots
Show Answer & Explanation
Correct Answer: B
Stomata are small openings on the leaf surface that allow for the exchange of gases, including the intake of carbon dioxide for photosynthesis and the release of oxygen.
Q7
Medium
Which of the following factors does NOT affect the rate of transpiration in plants?
A.
Humidity levels
B.
Soil moisture content
C.
Temperature
D.
Type of soil
Show Answer & Explanation
Correct Answer: D
While factors like humidity, soil moisture, and temperature directly influence transpiration rates, the type of soil does not inherently affect the rate of transpiration, making this the correct choice.
Q8
Hard
Which of the following statements best describes the role of the xylem in plants?
A.
Xylem transports water and minerals from the roots to the leaves.
B.
Xylem is primarily responsible for transporting organic nutrients throughout the plant.
C.
Xylem helps in the process of photosynthesis by transporting glucose.
D.
Xylem stores energy in the form of starch for later use.
Show Answer & Explanation
Correct Answer: A
Xylem is primarily responsible for the transport of water and minerals from the roots to other parts of the plant, particularly the leaves, making option A the correct answer.
Q9
Hard
In a plant, which of the following structures is primarily responsible for the transport of water and minerals from the roots to the leaves?
A.
Phloem
B.
Xylem
C.
Cortex
D.
Pith
Show Answer & Explanation
Correct Answer: B
Xylem is the tissue in plants responsible for the transport of water and dissolved minerals from the roots to the rest of the plant, particularly the leaves. Phloem, on the other hand, transports sugars and nutrients downwards from the leaves.
Q10
Hard
A student conducts an experiment to measure the rate of transpiration in a plant. If the plant loses 50 mL of water over 2 hours, what is the transpiration rate in mL per hour?
A.
20 mL/h
B.
25 mL/h
C.
30 mL/h
D.
35 mL/h
Show Answer & Explanation
Correct Answer: B
To find the transpiration rate, divide the total water lost (50 mL) by the time (2 hours). This gives 50 mL / 2 h = 25 mL/h, which is the correct answer.
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Transport System — WAEC (West Africa) WAEC Biology Practice Questions Online
This page contains 148 practice MCQs for the chapter Transport System in WAEC (West Africa) WAEC Biology. The questions are organized by difficulty — 45 easy, 74 medium, 29 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.