IGCSE · Biology 0610 · Transport

Translocation: IGCSE Biology questions with answers

Free Translocation questions for IGCSE Biology (0610), Extended tier (Supplement content), part of Transport. Each question has the answer and the marking points an examiner would look for.

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Translocation practice questions

Question 1Multiple choice · 1 markA* challenge

Sucrose is translocated in the phloem from sources to sinks.
1    A storage organ can be a sink at one time and a source at another.
2    A developing seed is a sink.
3    Sucrose is moved through dead xylem vessels.
Which statements are correct?

  1. A 1, 2 and 3
  2. B 1 and 2 only
  3. C 1 only
  4. D 2 only
Show answer

Answer: B

Question 2Multiple choice · 1 mark

Which part of a plant is usually a source of sucrose in summer?

  1. A the leaves
  2. B the roots
  3. C the fruits
  4. D the flowers
Show answer

Answer: A

Question 3Multiple choice · 1 mark

Which statement describes translocation?

  1. A The movement of sucrose and amino acids in phloem from sources to sinks
  2. B Excess nutrients in water cause algal growth, bacterial decomposition and a fall in dissolved oxygen
  3. C The transfer of pollen grains from an anther to a stigma
  4. D A hormone that controls female secondary sexual characteristics
Show answer

Answer: A

Question 4Multiple choice · 1 markA* challenge

Sucrose is translocated in the phloem from sources to sinks.
1    Sucrose is moved through dead xylem vessels.
2    Translocation only happens in the dark.
3    A leaf photosynthesising in bright light is a source.
Which statements are correct?

  1. A 1, 2 and 3
  2. B 1 and 3 only
  3. C 2 and 3 only
  4. D 3 only
Show answer

Answer: D

Question 5Structured · 6 marksA* challenge

Sucrose is transported in the phloem by translocation.

(a)

Define translocation.

[2]
(b)

Give one example of a source and one example of a sink.

[2]
(c)

Explain why a storage organ can be a sink at one time of year and a source at another.

[2]
Show answers and mark scheme
PartAnswer and marking pointsMarks
(a)movement of sucrose and amino acids in phloem from source to sink
movement of sucrose and amino acids in the phloem B1
from sources to sinks B1
2
(b)leaf; root/fruit
source: photosynthesising leaf (or storage organ in spring) B1
sink: growing root/fruit/storage organ B1
2
(c)stores sugar in summer, releases in spring
in summer it receives and stores sucrose (sink) B1
in spring it releases sugars for new growth (source) B1
2
Question 6Structured · 3 marks

Aphids feed on phloem sap.

(a)

Suggest why aphids feed from the phloem rather than the xylem.

[1]
(b)

Explain why aphid damage reduces the growth of fruits.

[2]
Show answers and mark scheme
PartAnswer and marking pointsMarks
(a)phloem contains sugars
phloem contains sucrose and amino acids (nutrients) B1
1
(b)less sucrose reaches sinks
less sucrose is translocated to the fruits (sinks) B1
so less energy/material for growth B1
2

More Transport questions

Xylem & phloemWater uptake & transpirationHeart & circulationBlood vesselsBlood

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Original Cambridge-style practice questions written for mentorriyaz.in. These are not Cambridge past paper questions, and this site is not affiliated with or endorsed by Cambridge University Press & Assessment. Updated 2026-11-04. Paper generator · mentorriyaz.in