2009 年
生物 · 共 60 題 · 點擊選項即時核對答案
Questions 51 and 52 refer to the following description of the production of single-cell proteins. Other than growing plant crops for animal feeds, there is research on methods of producing proteins for animal feeds. Owing to the rapid growth rate, single-cell organisms are used to produce high protein products, known as single-cell protein (SCP). Single-cell protein is produced commercially on a large scale under controlled conditions.
Which of the following can be used for producing single-cell protein (SCP)?
Questions 51 and 52 refer to the following description of the production of single-cell proteins. Other than growing plant crops for animal feeds, there is research on methods of producing proteins for animal feeds. Owing to the rapid growth rate, single-cell organisms are used to produce high protein products, known as single-cell protein (SCP). Single-cell protein is produced commercially on a large scale under controlled conditions.
Which of the following is / are advantage(s) gained by producing SCP for animal feeds rather than using a plant crop?
Fossil records show
Long-term and repeated use of a particular insecticide will lead to an increase in the population of mosquitoes resistant to the insecticide. Which of the following correctly explains this phenomenon?
The graph below shows the rate of water absorption and the rate of water loss of a plant from 0900 hour to 2100 hour on a certain day:
Based on the information in the above graph, during which period did the plant suffer from the greatest net loss of water?
The diagram below shows a potometer:
Which of the following can improve the accuracy in measuring the rate of water uptake of this leafy shoot?
Two leaves with identical areas and masses were taken from different plant species. The two leaves were kept at the same environmental conditions as shown in the set-up in Figure I for one hour. The masses of the two set-ups were measured during the experiment. Figure II shows the results of the experiment.
As shown in Figure II, there is a difference in the change in mass between the two set-ups. This difference is probably due to
Two persons, X and Y, were given different injections to protect them from a particular virus. The graph below shows the antibody levels in their blood samples after the injections:
Which of the following combinations correctly states the substances injected into X and Y?
| X | Y | |
|---|---|---|
| weakened virus | vaccine | |
| antibodies against the virus | weakened virus | |
| vaccine | antibiotic | |
| antibiotic | antibodies against the virus |
Questions 59 and 60 refer to the diagram below, which shows the experimental set-up used by a student to find out the rate of photosynthesis of a water plant:
0.05 mL oxygen (O₂) was collected after 20 minutes. What is the photosynthetic rate per unit mass of this water plant?
Questions 59 and 60 refer to the diagram below, which shows the experimental set-up used by a student to find out the rate of photosynthesis of a water plant:
Which of the following modifications of the set-up would increase the photosynthetic rate per unit mass of this water plant?