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This question is about plant transport systems - AQA - GCSE Biology Combined Science - Question 6 - 2021 - Paper 1
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
Worked Solution & Example Answer:This question is about plant transport systems - AQA - GCSE Biology Combined Science - Question 6 - 2021 - Paper 1
Step 1
Describe how water is transported from the soil to the atmosphere through a plant.
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
Explain one way sieve tube cells are specialised for their function.
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
What does the structure of the companion cells suggest about the process that moves dissolved sugars through the phloem tissue? Give a reason for your answer.
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
Describe why it is important that dissolved sugars are moved both upwards and downwards in a plant.
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.