A-Level Biology OCR A
Evidence Active Flow Companion Cells Process Mass Aphids
| Front |
Describe and explain 4 sources of evidence for processes involved in translocation. |
| Back |
Evidence for translocation:
- Microscopy - adaptations of companion cells for active transport
- Poison - if mitochondria of companion cells are poisoned, translocation stops - active process
- Flow 10k times faster than it would be by diffusion - active process driving mass flow
- Aphids - sap continues to exude from proboscis of aphid - evidence for pressure driven mass flow bc aphids dont have to suck
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A-Level Biology OCR A