TREE PHYSIOLOGY
TRANSPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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for downward translocation of organic nutrients to root cell.
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for upward translocation of minerals to stem tip.
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for providing support to the plant part.
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for providing water to the neighbouring cells.
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Detailed explanation-1: -Translocation occurs in the phloem tissues, which consist of tube-like vessels called phloem vessels. These phloem vessels run from the leaves into every other part of the plant and are responsible for transporting dissolved organic solutes, such as sucrose and amino acids, from the sources to the sinks.
Detailed explanation-2: -The photosynthates from the source are usually translocated to the nearest sink through the phloem sieve tube elements. For example, the highest leaves will send sugars upward to the growing shoot tip, whereas lower leaves will direct sugars downward to the roots.
Detailed explanation-3: -Phloem is one of the two tissues that make up the plant’s long-distance transport system, the other being xylem. Phloem translocates water and products of photosynthesis from source tissues to the sink regions where they are utilized or stored.
Detailed explanation-4: -Girdling shows that phloem is the tissue responsible for translocation of food and that take place in one direction that is towards the root.
Detailed explanation-5: -The phloem carries important sugars, organic compounds, and minerals around a plant. Sap within the phloem simply travels by diffusion between cells and works its way from leaves down to the roots with help from gravity. The phloem is made from cells called ‘sieve-tube members’ and ‘companion cells’.