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Question 6
This question is about plant transport systems. 06.1 Describe how water is transported from the soil to the atmosphere through a plant. 06.2 Dissolved sugars are m... show full transcript
Step 1
Answer
Water is absorbed from the soil by osmosis through the root hair cells. Once inside the plant, it travels through the xylem vessels upwards to the leaves. From the leaves, water is lost through small openings called stomata into the atmosphere, a process driven by evaporation and transpiration.
Step 2
Step 3
Answer
Sieve tube cells have pores in their end walls, allowing for the free movement of dissolved sugars and food contents between cells. This structural adaptation maximizes the efficiency of sugar transport in the plant.
Step 4
Answer
The structure of the companion cells suggests that the movement of dissolved sugars through the phloem is an active process that requires energy. This is indicated by the numerous mitochondria present in companion cells, which provide ATP for active transport mechanisms.
Step 5
Answer
Moving dissolved sugars both upwards and downwards is crucial for plant functioning. Sugars produced in the leaves during photosynthesis are transported to the roots for storage and growth. Furthermore, sugars sent downwards also supply energy for respiration necessary for cellular functions throughout the plant, ensuring all tissues receive the nutrients they need.
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