Home / iGCSE / Coordinated Sciences / B8.1 Xylem and phloem Paper 2

CIE iGCSE Co-Ordinated Science B8.1 Xylem and phloem Exam Style Questions Paper 2

CIE iGCSE Co-Ordinated Science Paper 2 - All Chapters

Question

Which statement about transport in plants is correct?

A. Amino acids are moved from source to sink in the xylem.
B. Glucose is moved from sink to source in the xylem.
C. Sucrose is moved from source to sink in the phloem.
D. Starch is moved from sink to source in the phloem.

▶️ Answer/Explanation
The phloem transports sucrose and amino acids from sources (where they are produced or stored) to sinks (where they are used or stored). Option C correctly describes this process. The xylem transports water and mineral ions only (not amino acids or glucose), and starch is not transported in the phloem as it is a storage molecule.
✅ Answer: (C)

Question

Which label shows the position of the xylem in the cross-section of the root of a dicotyledonous plant?

▶️ Answer/Explanation
In a dicotyledonous root, the xylem forms a central, star-shaped (X-shaped) core running through the middle of the root.
The phloem tissue sits in separate groups between the arms of the xylem star.
Based on this arrangement, the central labelled region corresponds to label C.
✅ Answer: (C)

Question

Which row names the substances carried by xylem vessels and the direction of travel?

▶️ Answer/Explanation
Xylem vessels transport water and dissolved mineral ions absorbed by the roots.
The direction of flow in xylem is always from the roots up to the leaves, driven by transpiration.
Sucrose is carried by phloem, not xylem, ruling out rows A and B.
✅ Answer: (D)

Question

The photograph shows a potato plant. Potato plants have storage organs labelled Y.

Which statement correctly describes the transport of sucrose in the potato plant?

A. Sucrose is translocated from X to Y in the phloem.
B. Sucrose is translocated from Y to X in the xylem.
C. Sucrose is transpired from X to Y in the phloem.
D. Sucrose is transpired from Y to X in the xylem.

▶️ Answer/Explanation
Sucrose is translocated (transported) in the phloem from sources (like the leaves, X) to sinks (like the storage organs, Y). Transpiration is the loss of water vapour from leaves, not sucrose transport.
✅ Answer: (A)

Question

Which statement is correct?
(A) Xylem vessels are living and are involved in translocation.
(B) Xylem vessels are living and are involved in transpiration.
(C) Xylem vessels are dead and are involved in translocation.
(D) Xylem vessels are dead and are involved in transpiration.

▶Answer/Explanation

Ans: D

More CIE iGCSE Co-Ordinated Science Paper 2 Questions..
Scroll to Top