Aphids are small insects that obtain their food by feeding on phloem sap in plants. Fig. 3.1 is a diagram of an aphid with its mouth parts placed into the stem of a plant. The diagram labels phloem and xylem.
(a(i))[2]
State the names of the foods the aphid could draw from the phloem tissue.
(a(ii))[4]
Explain the role of phloem in plant transport. Include the words source and sink in your answer.
(b)[6]
Describe the ways xylem is adapted for its functions.
(c)[2]
Explain the advantages of killing pests.
Worked solution & mark scheme
This 14-mark question has a full step-by-step worked solution and mark scheme. One marking point: “sucrose or sugar” …