Which of the following statements is not correct?
1. | Pyramid of energy is always upright. |
2. | Pyramid of numbers in a grassland ecosystem is upright. |
3. | Pyramid of biomass in sea is generally inverted. |
4. | Pyramid of biomass in sea is generally upright. |
In the equation GPP – R = NPP, R represents:
1. Environment factor
2. Respiration losses
3. Radiant energy
4. Retardation factor
Which of the following representations shows the pyramid of numbers in a forest ecosystem?
1. | A | 2. | B |
3. | C | 4. | D |
Identify the likely organisms (a), (b), (c), and (d) in the food web shown below:
(a) |
(b) |
(c) |
(d) |
|
1. |
Dog |
Squirrel |
Bat |
Deer |
2. |
Rat |
Dog |
Tortoise |
Crow |
3. |
Squirrel |
Cat |
Rat |
Pigeon |
4. |
Deer |
Rabbit |
Frog |
Rat |
The rate of decomposition is faster in the ecosystem due to the following factors EXCEPT:
1. Detritus rich in sugars
2. Warm and moist environment
3. Presence of aerobic soil microbes
4. Detritus richer in lignin and chitin
Which of the following statements is incorrect regarding the phosphorus cycle?
1. | Phosphates are the major form of phosphorus reservoir. |
2. | Phosphorus solubilizing bacteria facilitate the release of phosphorus from organic remains. |
3. | There is an appreciable respiratory release of phosphorus into the atmosphere. |
4. | It is a sedimentary cycle. |
Which of the following statements is incorrect?
1. | Biomass decreases from first to fourth trophic level. |
2. | Energy content gradually increases from first to fourth trophic level. |
3. | Number of individuals decreases from first trophic level to fourth trophic level. |
4. | Energy content gradually decreases from first to fourth trophic level. |
1. | Much larger amount of energy flows through the ecosystem than the amount of nutrients |
2. | Energy is recycled, but nutrients are not |
3. | The requirement of nutrients is obligatory for organisms but the requirement of energy is not. |
4. | Nutrients are recycled, but energy is not. |
1. | It occurs only through the process of photosynthesis. |
2. | Almost all life on Earth relies directly or indirectly on primary production. |
3. | Net primary production is available for consumption by herbivores. |
4. | Gross primary productivity minus the respiratory loss is the net primary productivity. |