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Date May 2012 Marks available 8 Reference code 12M.2.HL.TZ2.7
Level Higher level Paper Paper 2 Time zone Time zone 2
Command term Compare Question number 7 Adapted from N/A

Question

Outline pollination, fertilization and seed dispersal.

[4]
a.

Compare the processes of spermatogenesis and oogenesis.

[8]
b.

Markscheme

pollination is the transfer of pollen to the stigma/carpel/pistil of a flower;
pollen grains grow a pollen tube down the style to the ovule;
male and female gametes/nuclei join/fuse (in the ovule/ovary) during fertilization;
the ovary matures into a fruit;
dispersal of seeds depends on the fruit;
example of seed dispersal; (e.g. pods split open to scatter seeds, e.g. animal eats fruit / ingests and egests seed)

a.

 To award [8 max], responses must provide at least one similarity.  Responses do not need to be shown in a table format.

b.

Examiners report

This part of the question was an area of strength in terms of student understanding of concepts and structure of answers. The most likely aspect to cause problems was the distinction between pollination and fertilization.

a.

This question was answered reasonably well with improvements seen over previous years in terms of the degree to which candidates carried out a comparison throughout. There was occasionally a digression into irrelevant aspects of the menstrual cycle.

b.

Syllabus sections

Additional higher level » Topic 11: Animal physiology » 11.4 Sexual reproduction
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