Edexcel GCSE Biology

Plant transport

Edexcel GCSE Biology revision on Plant transport. Aligned to the Pearson Edexcel GCSE Biology 1BI0 specification. This bank has 25 practice questions on this topic.

Sample questions (3 of 25)

  1. Question 1

    Xylem vessels transport...

    • A) Water + minerals from roots to leaves
    • B) Sugars + amino acids from leaves to rest of plant
    • C) Oxygen only
    • D) Pollen
    Show answer

    Answer: Water + minerals from roots to leaves

    XYLEM: tubes made of dead, hollow cells with thick lignified walls. Carry water + dissolved minerals UPWARDS from roots to leaves. One-way transport. Wood is mostly xylem. PHLOEM: living cells, transport sugars (sucrose) + amino acids both up + down to where they're needed (translocation).

  2. Question 2

    Phloem tubes transport...

    • A) Water only
    • B) Sucrose and amino acids around the plant
    • C) Air
    • D) Spores
    Show answer

    Answer: Sucrose and amino acids around the plant

    Phloem carries the products of photosynthesis (sucrose, amino acids) from the LEAVES (where they're made) to other parts (growing tips, fruits, roots for storage). Movement called TRANSLOCATION - can be in either direction depending on where the demand is. Sieve tube cells joined end-to-end through sieve plates.

  3. Question 3

    Transpiration is...

    • A) Plants breathing
    • B) The loss of water vapour from leaves (mostly through stomata)
    • C) Water absorption by roots only
    • D) Photosynthesis
    Show answer

    Answer: The loss of water vapour from leaves (mostly through stomata)

    Water absorbed by roots -> travels up xylem -> evaporates from leaf surfaces into the air, mostly through STOMATA (pores in lower epidermis). The 'transpiration stream' continuously pulls water + minerals up the plant. Faster transpiration in: high temperature, low humidity, wind, bright light. Excessive loss = wilting -> stomata close (controlled by guard cells).

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