Productivity is the rate of production of biomass expressed in terms of :
i.
ii.
iii.
iv.
1. | ii | 2. | iii |
3. | ii and iv | 4. | i and iii |
In an ecosystem, the rate of production of organic matter during photosynthesis is called as its:
1. | Gross Primary productivity |
2. | Net Primary productivity |
3. | Secondary productivity |
4. | Non productivity |
Net primary productivity is the gross primary productivity minus:
1. | that which is consumed by herbivores |
2. | that which is consumed by the producer in metabolism |
3. | secondary productivity |
4. | loss due to mortality |
The annual net primary productivity of whole biosphere is approximately:
1. | 25 billion tons | 2. | 55 billion tons |
3. | 70 billion tons | 4. | 170 billion tons |
What percentage of photosynthetic active radiation is captured by plants?
1. | 1 – 5 | 2. | 2 – 10 |
3. | 50 | 4. | 90 |
On the land, almost all primary production is performed by:
1. | Phytoplanktons | 2. | Algae |
3. | Mosses and Liverworts | 4. | Vascular plants |
Suppose in an area, the energy present in total incident sunlight falling on primary producers is 10,00,000 J and about 10,000 J is converted by them into biomass. What percent of PAR have the primary producers been able to convert?
1. | 1 % | 2. | 2 % |
3. | 10 % | 4. | 20 % |