PLANT PHYSIOLOGY
TRANSPORT IN PLANT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The cells in the plants stop respiring.
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The xylem no longer takes in water for the plant.
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Active transport of mineral salts can no longer occur.
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The plant can no longer synthesize sugars to provide energy.
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Detailed explanation-1: -The rate of translocation in the phloem was observed to decrease steadily after a plant was placed in an environment without oxygen for several minutes. Why did this happen? The cells in the plants stop respiring. The xylem no longer takes in water for the plant.
Detailed explanation-2: -Several abiotic factors that affect phloem transport include water and salt stress, mineral deficiency, CO2, light, temperature, air, and soil pollutants, while biotic factors include mutualistic and pathogenic microbes, viruses, aphids and parasitic plants.
Detailed explanation-3: -Because translocation connects distant components of the plant body, xylem and phloem have long been considered to fulfill a role in communicating between organs, through the movement of plant hormones and other signaling molecules. Such signals are envisaged to move with assimilates by mass flow.
Detailed explanation-4: -Living cells are organised end to end in phloem. Unlike xylem, cytoplasm is found in phloem vessels, and it passes via holes from one cell to the next. Sucrose and amino acids are transported up and down the plant by phloem. This is referred to as translocation.