2003 年

Questions 50 and 51 refer to the graph below, which shows the effect of auxin concentration on the growth of roots and shoots :

A bean seedling, with its root tip removed, was pinned in a moist and dark chamber. A paste of cream containing 10⁻¹ ppm auxins was smeared on one side of the root as shown in the diagram below :

After two days, the root was found to bend upwards. Which of the following is responsible for this change ?

Questions 52 and 53 refer to the diagram below, which shows part of the nitrogen cycle :

Which process may reduce the fertility of the soil ?

Questions 52 and 53 refer to the diagram below, which shows part of the nitrogen cycle :

Which of the following statements is correct ?

Cross pollination is the transfer of pollens from one plant to another plant of the same species. It may be beneficial to the plant species because it leads to

The table below lists some information about two brothers :

Note : Blood group A, brown eye colour and tongue rolling are dominant characters. What can be implied from the above information ?

Which of the following comparisons of the cerebrum and the spinal cord is correct ?

The photomicrographs below show four stages in the cell division of plant cells :

The correct sequence of the four stages is

Questions 58 and 59 refer to the diagrams below, which show the human female reproductive system and the carpel of a flower :

Which of the following pairs of structures and their roles in reproduction are correctly matched ?

Questions 58 and 59 refer to the diagrams below, which show the human female reproductive system and the carpel of a flower :

Which of the following parts will increase greatly in size after fertilization ?

Which of the following is a relatively reliable parameter for measuring the growth of a person ?