Average velocity of movement of sugars in phloem is:
Correct answer: C. 1 meter/hour
- A. 1 meter/8 years
- B. 1 meter/day
- C. 1 meter/hour
- D. 20 cm/min
Explanation
The correct answer is "1 meter/hour" because studies have shown that the average velocity of sugar transport in the phloem is approximately 1 meter per hour. This rate allows for effective distribution of nutrients throughout the plant. Option A significantly underestimates the rate, making it impractical for plant function. Option B, while plausible under some conditions, generally underestimates typical rates. Option D suggests a much faster rate than is commonly observed, which can occur but is not the average.
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About Forms and Functions of Plants
Plant nutrition and transport cover mineral uptake, photosynthesis, xylem movement of water and minerals, and phloem translocation of sugars. Plant growth regulators include auxins, gibberellins, cytokinins, abscisic acid and ethene, whose effects on cell division, elongation, dormancy, fruit ripening and tropic responses should not be confused with mineral nutrition.
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