2011 年

Questions 50 to 52 refer to the following experimental set-up, used for studying the effect of magnesium deficiency on the growth of the young seedlings:

The seedlings show a yellowing of the leaves after one week. This is because magnesium is essential for

The diagrams below show the structures of a sperm and a pollen grain with a pollen tube:

Which of the following combinations correctly matches a pair of structures and their function?

Questions 54 and 55 refer to the following diagrams, showing a foetus in the uterus and a seed:

Which structure of the seed has a similar function to fluid X?

Questions 54 and 55 refer to the following diagrams, showing a foetus in the uterus and a seed:

Which structure(s) in the seed has/have a role similar to the growing foetus?

Questions 56 and 57 refer to the following photographs, which show the longitudinal sections of a flower and the fruit of a plant:

Which of the following combinations correctly shows the floral parts from which structures (1), (2) and (3) have developed?

The diagram below shows the sedimentary layers at the bottom of a sea, where fossils of organisms are found:

Which of the following statements about the organisms forming the fossils in these layers is correct?

The following shows the results of an experiment in which two coleoptiles were exposed to unilateral light from the left:

What conclusion can be drawn from this experiment?

The following shows the set-ups of an experiment and the results after two days. Both set-ups were placed in darkness throughout the experiment.

Which of the following combinations correctly describes the effect of this concentration of auxins on the growth of the coleoptile and the root?