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Quiz Chapter 3: Transportation

10 questions ยท Form 3 Science Bab 3: Transportation

Question 1 of 10Score: 0

What is the primary suction force that moves water from plant roots up through the xylem to the leaves?

Full Question List & Answer Key

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1. What is the primary suction force that moves water from plant roots up through the xylem to the leaves?

  1. Translocation force
  2. Transpiration pull
  3. Gravitational pull
  4. Photosynthetic pressure
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Answer: B

The evaporation of water from stomata creates a suction force called transpiration pull, drawing a continuous water column up xylem vessels.

2. Which material reinforces and thickens xylem vessel walls, providing structural rigidity to plants?

  1. Lignin
  2. Starch
  3. Chitin
  4. Pectin
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Answer: A

Lignin deposits in xylem vessel walls strengthen the tubes and prevent them from collapsing under negative pressure.

3. How does an increase in relative air humidity affect the rate of transpiration in plants?

  1. It increases the transpiration rate drastically
  2. It decreases the transpiration rate
  3. It has no impact on transpiration
  4. It forces guard cells to open permanently
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Answer: B

High humidity means the surrounding air is already saturated with water vapor, decreasing the concentration gradient and lowering transpiration rate.

4. What is the term given to the transport of soluble organic products of photosynthesis through phloem tissue?

  1. Transpiration
  2. Translocation
  3. Osmosis
  4. Guttation
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Answer: B

Translocation is the process by which phloem tissue transports dissolved organic sugars from source leaves to sink tissues.

5. A person with blood group O can safely donate blood to which blood groups?

  1. Group O only
  2. Group AB only
  3. Groups A and B only
  4. Groups A, B, AB, and O
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Answer: D

Blood group O red cells carry neither A nor B antigens, so they will not trigger antibody reactions in any recipient group (universal donor).

6. Which type of blood vessel features a wall that is only one cell thick?

  1. Artery
  2. Arteriole
  3. Vein
  4. Blood capillary
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Answer: D

Capillary walls consist of a single layer of endothelial cells, enabling fast exchange of nutrients and gases via diffusion.

7. What structural feature distinguishes veins from arteries?

  1. Veins have thicker muscular walls than arteries
  2. Veins possess internal valves to prevent blood backflow
  3. Veins carry blood away from the heart under high pressure
  4. Veins have walls that are only one cell thick
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Answer: B

Veins carry low-pressure blood toward the heart and contain internal valves along their length to prevent backflow.

8. How many heart chambers are present in the circulatory system of a adult frog?

  1. 2 chambers (1 atrium, 1 ventricle)
  2. 3 chambers (2 atria, 1 ventricle)
  3. 4 chambers (2 atria, 2 ventricles)
  4. 1 chamber
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Answer: B

Amphibians like frogs have a 3-chambered heart consisting of two atria and a single shared ventricle.

9. Which heart valve separates the left atrium from the left ventricle?

  1. Tricuspid valve
  2. Bicuspid (Mitral) valve
  3. Semilunar valve
  4. Aortic valve
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Answer: B

The bicuspid valve (mitral valve) is located between the left atrium and left ventricle.

10. What is the function of the septum in the human heart?

  1. To regulate the electrical impulses triggering heartbeats
  2. To separate oxygenated blood on the left side from deoxygenated blood on the right side
  3. To pump blood directly into the pulmonary artery
  4. To prevent backflow of blood from the aorta into the left ventricle
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Answer: B

The septum is a thick muscular wall separating the left and right sides of the heart, preventing mixing of oxygenated and deoxygenated blood.

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