OCR A Level Biology A
OCR A Level Biology A Transport in Plants Exam Questions
Free OCR A Level Biology A exam questions on Transport in Plants, with mark schemes. Covers xylem, phloem, transpiration, translocation and xerophytes.
Transport in Plants exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
StemUp mark scheme flashcards
OCR A Level Biology A H420 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About OCR A Level Biology A Transport in Plants
This topic covers how plants move water and sugars.
What you need to know
- Vascular tissue Structure of xylem vessels and phloem sieve tubes.
- Transpiration Factors affecting rate and using a potometer.
- Water movement Apoplast and symplast pathways, root pressure and cohesion-tension.
- Translocation Mass flow of sucrose from source to sink.
Common mistakes in Transport in Plants
- Saying phloem moves only downwards.
- Confusing transpiration and translocation.
- Forgetting a potometer measures water uptake.
Try three Transport in Plants exam-style questions
1. State two factors that increase transpiration. (2 marks)
Show the mark scheme answer
Higher temperature (1) and higher light intensity or wind speed (1).
2. Explain how xerophytes reduce water loss. (2 marks)
Show the mark scheme answer
Features like sunken stomata or rolled leaves (1) trap humid air and reduce the gradient (1).
3. Describe the role of companion cells. (1 mark)
Show the mark scheme answer
They actively load sucrose into sieve tubes.
Transport in Plants FAQs
What does Transport in Plants cover?
Xylem, phloem, transpiration and translocation.
Which practical links here?
Using a potometer.
Why cut the shoot underwater?
To stop air entering the xylem.
Revise this topic with flashcards: OCR A Level Biology A H420 Flashcards, with mark scheme answers for Anki and Quizlet.
