2000 年
生物 · 共 59 題 · 點擊選項即時核對答案
Questions 40 to 42 refer to the following information : The allele for curly hair in humans is dominant to the allele for straight hair. The pedigree below shows the inheritance of curly hair and straight hair in a family :
If individuals 4 and 5 are twins, which of the following conclusions can be drawn ?
Questions 40 to 42 refer to the following information : The allele for curly hair in humans is dominant to the allele for straight hair. The pedigree below shows the inheritance of curly hair and straight hair in a family :
Individual 3 is taller than individual 4. Which of the following may contribute to such a difference ?
The photograph below shows some egrets standing on the back of buffaloes :
The egrets feed on insects in the grass, which the buffaloes disturb as they move around in the grass. The association between the egret and the buffalo is an example of
A student soaked some mung beans in water for two days and then put them on moist cotton wool in a petri dish. Which of the following graphs indicates the change in dry mass of the seedlings ?
Questions 45 and 46 refer to the diagram below, which shows a glass bottle containing some pond weeds and snails. Under suitable conditions, the organisms inside the bottle can live for many years.
To keep the organisms alive, the bottle needs a constant supply of
Questions 45 and 46 refer to the diagram below, which shows a glass bottle containing some pond weeds and snails. Under suitable conditions, the organisms inside the bottle can live for many years.
Which of the following must be present in this ecosystem ?
The graph below shows the monthly variations of nitrogen dioxide and respirable suspended particulates (RSP) in the atmosphere in Central and Western District of Hong Kong during the year 1997.
Which of the following statements concerning the graph may be incorrect ?
Questions 49 and 50 refer to the graphs below, which show the changes in the antibody level in the blood as a result of two methods of inducing immunity in humans :
Substance P can be
Questions 49 and 50 refer to the graphs below, which show the changes in the antibody level in the blood as a result of two methods of inducing immunity in humans :
What is the advantage of method 2 over method 1 in inducing immunity ?
Potato plants can be reproduced by seeds or by stem tubers. Stem tubers are organs for vegetative propagation. Which of the following comparisons between these two methods of reproduction is correct ?
| Seed | Stem tuber | ||
|---|---|---|---|
| Genetic variation in offspring | less | more | |
| Chromosome number of the cells of offspring | haploid | diploid | |
| Chance of dispersal of offspring | smaller | greater | |
| Chance of passing infectious diseases to offspring | smaller | greater |