| 1 |
In succesion lithoseres takes place on: |
- A. Sand
- B. Water
- C. Forest floor
- D. Bare rocks
|
| 2 |
Each nuclear power station only can last for about |
- A. 10 years
- B. 20 years
- C. 30 years
- D. 40 years
|
| 3 |
The earth surface covered with water is |
- A. 35%
- B. 11%
- C. 21%
- D. 33%
|
| 4 |
Cacti and Euphorbia are the desert plants which store water in their. |
- A. Fleshy leaves
- B. Freshy stems
- C. Freshy roots
- D. Freshy buds
|
| 5 |
Which statement defines the net primary production in an ecosystem over a given time period? |
- A. The total amount of organic matter in the plants in excess of that used in respiration
- B. The total amount of organic matter used in respiration by all the organisms present
- C. The total amount of photosynthesis product from all plants
- D. The total amount of organic matter in all organisms present
|
| 6 |
Which of the following is NOT recycled in ecosystem? |
- A. Carbon
- B. Sulphur
- C. Energy
- D. Water
|
| 7 |
The productivity of aquatic ecosystem is determined by light and |
- A. CO2
- B. Temperature
- C. Nutrients
- D. Water
|
| 8 |
Limetic phytoplankton include the. |
- A. Bacteria
- B. Cyanobacteria
- C. Fishes
- D. Mouses
|
| 9 |
Oxone molecule is made up by binding of three atoms of |
- A. Nitrogen
- B. Oxygen
- C. Hydrogen
- D. Carbon
|
| 10 |
The decline in thickness of the ozone layer is caused by increasing level of |
- A. Chlorofluorocarbon
- B. Nitrogen
- C. Chlorine
- D. Carbon dioxide
|