| 1 |
What will be the age of willow tree 10 centimeter long and 70 centimeter in diameter |
- A. 40 years
- B. 50 years
- C. 60 years
- D. 70 years
|
| 2 |
Modern man is called |
- A. Homo erectus
- B. Homo habilis
- C. Homo sapiens
- D. Homo neanderthalensis
|
| 3 |
The productivity of aquatic ecosystem is determined by light and |
- A. CO2
- B. Temperature
- C. Nutrients
- D. Water
|
| 4 |
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
|
| 5 |
The decline in thickness of the ozone layer is caused by increasing level of |
- A. Chlorofluorocarbon
- B. Nitrogen
- C. Chlorine
- D. Carbon dioxide
|
| 6 |
Which of the following is NOT recycled in ecosystem? |
- A. Carbon
- B. Sulphur
- C. Energy
- D. Water
|
| 7 |
The study of hman populations and things that affect them is called: |
- A. Angiography
- B. Demography
- C. Mammography
- D. Homography
|
| 8 |
The earth surface covered with water is |
- A. 35%
- B. 11%
- C. 21%
- D. 33%
|
| 9 |
At the time of independence in 1947 the population of pakistan was |
- A. 10 m
- B. 20 m
- C. 25.7 m
- D. 32.5 m
|
| 10 |
Which of the following is the most fragile ecosystem. |
- A. Grass land
- B. Wood land
- C. Tundra
- D. Savanna
|
