Life Processes in Living Organisms — Science STD 9 — Question
Maharashtra BoardEnglish MediumSTD 9ScienceLife Processes in Living Organisms3 Marks
Question
Describe the transportation system in plants.
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Answer
Plants have two types of conducting tissues i.e., xylem which conducts water and phloem which conducts food.
During transpiration, water is released into the atmosphere.
As a result, water level is the epidermal layer of the leaf decreases.
Water is brought up to the leaves through the xylem so as to compensate for the lost water.
Transpiration helps in absorption of water and minerals and distribution to all parts of the plant whereas root pressure preforms the important role of pushing the water up at night time.
The food produced by leaves is transported to each cell of the plant through phloem.
When the food material like sucrose is transported towards a part of the plant through phloem, using ATP, the water concentration in that part decreases.
As a result, water enters the cell by diffusion. The pressure on the cell wall increases due to increase in the cellular contents.
Due to the increased pressure, food is pushed into the neighboring cells where the pressure is low.
This process helps the phloem to transport the materials as per the need of the plant.
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