BOTANY
PLANT PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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On rainy days, the in the air is lower. makes plants less dehydrated
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Plants must accumulate minerals in their roots to raise the in the roots so that they can attract water to the roots.
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in phloem is less than in xylem at the source region. This causes pressure to transport sugar.
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from transpiration makes shore near the leaf lower than shore near the root thus allowing plants to transport water in one direction
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Detailed explanation-1: -Water potential () is a measure of water’s potential to do work. In order to do work, an object must be able to apply enough force to another object to cause displacement. In order for water to displace another object, water must be moving.
Detailed explanation-2: -Water potential is lowered by transpiration from the leaves assisted by the cohesive forces between water molecules causing water to be under tension, i.e., under negative pressure.
Detailed explanation-3: -Water potential is the energy required, per quantity of water, to transport an infinitesimal quantity of water from the sample to a reference pool of pure free water. To understand what that means, compare the water in a soil sample to water in a drinking glass.
Detailed explanation-4: -Water in its purest form has the maximum water potential.