Cellular Transport and Plant Vessels — OCR GCSE Combined Science B J260
OCR GCSE Combined Science B · J260
Cellular Transport and Plant Vessels
What you need to know
Describe the specific substances transported into and out of photosynthetic organisms—such as oxygen, carbon dioxide, water, and mineral ions—in relation to the organism's fundamental biological requirements.
Explain the mechanisms of cellular transport, detailing how diffusion, osmosis, and active transport actively move substances across cell membranes.
Describe practical, hands-on investigations designed to observe, measure, and analyze the processes of diffusion and osmosis.
Explain how the partially permeable properties of cell membranes in both plant and prokaryotic cells effectively support their respective cellular functions.
Explain the uptake of water and mineral ions by plants, directly relating the unique anatomical structure of root hair cells to their vital absorptive function.
Explain the specific structural adaptations of xylem and phloem vessels that enable their distinct and essential transport functions within the plant body.
Describe the practical techniques required to use a light microscope to accurately observe and identify the structure of xylem and phloem tissues.
Describe the physiological processes of transpiration and translocation, placing special emphasis on the structure and regulatory function of stomata.
Describe the proper setup, execution, and data collection process when using a simple potometer to measure transpiration rates.
Explain how various environmental factors, including light intensity, air movement, and temperature, directly impact the rate of water uptake in plants.
