Question 19M.3.HL.TZ2.b.ii
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.HL.TZ2.b.ii |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | Outline | Question number | b.ii | Adapted from | N/A |
The drawing shows part of a Thunbergia grandiflora plant. It has been widely cultivated as an ornamental garden plant.
[Source: from Wight, R., Icones Plantarum Indiae Orientalis, vol. 3 (1846)]
The drawing shows a section through a T. grandiflora flower, which contains a honeybee (Apis mellifera).
[Source: © D G Mackean (www.biology-resources.com/drawing-plant-flower-tropical-06.html)]
Outline the relationship the bee has with the T. grandiflora flower.
[2]
a. mutualistic relationship
OR
bee gets nectar/pollen «as food» AND flower is pollinated/fertilized ✔ Both needed.
b. when bee enters, pollen from anther sticks to it ✔
c. pollen is picked up by stigma «of same or other flower» ✔
Although some could not write "mutualistic/mutualist", the majority could outline the relationship, but some confused pollination, fertilization and seed dispersal; it was more difficult for most to name either the anther or the stigma.
