Question 1
Paper 2Easy6 marksA student prepares a transverse section of a dicotyledonous leaf to examine the arrangement of tissues involved in gas exchange.
(a)[4]
Draw a plan diagram of the section. Label the waxy cuticle, upper and lower epidermis, palisade mesophyll, spongy mesophyll, air spaces and a vein. Do not draw individual cells.
(b)[2]
State one role in gas exchange of the air spaces and one role of the guard cells of a stoma.