When setting up a potometer to measure the rate of transpiration, a student cuts the stem of a leafy shoot underwater before attaching it to the apparatus.
What is the reason for cutting the stem underwater?
To prevent air from entering and blocking the xylem vessels.
To wash away any pathogens from the cut surface of the stem.
To reduce the rate of transpiration so the bubble moves slower.
To ensure that the water reservoir is completely filled.
82 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.