Answers to AQA GCSE Plant Organ System (Biology)
Practice Questions
1.Using the image below of a cross section of a root, label the position of the xylem and phloem.
In the diagram above the blue cross is the xylem, the green segments are the phloem
2. State 3 ways that a root hair cell is adapted for its function.
1.Have a long, thin extension (root hair) that increases the cell’s surface area for absorption of water by osmosis and mineral ions by active transport.
2.Thin cell wall to make it easier for water and mineral ions to move through.
3.Large permanent vacuole to maintain a steep concentration gradient for osmosis.
4.Lots of mitochondria to release energy (ATP) for active transport of mineral ions.
3. State the name of the process that root hair cells use to absorb mineral ions such as nitrate ions.
Active transport