Q. No.Which one of the following is a primary consumer in maize field ecosystem?
1. Grasshopper
2. Wolf
3. Phytoplankton
4. Lion
1. Small plants
2. Fish
3. Man
4. Zooplankton
The breakdown of detritus into smaller particles by earthworm is a process called:
1. Catabolism
2. Humification
3. Fragmentation
4. Mineralisation
Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?
1. Frog
2. Sparrow
3. Lion
4. Goat
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 formation of new organic matter by rabbits in grassland is called:
1. Secondary productivity
2. Net primary productivity
3. Gross primary productivity
4. Net productivity
Which one of the following is not used for the construction of ecological pyramids?
| 1. | Dry weight | 2. | Number of individuals |
| 3. | Rate of energy | 4. | Fresh weight |
1. temperate deciduous forests
2. alpine forests
3. scrub forests
4. tropical rain forests
| (A) | removal of 80% of tigers from an area resulted in greatly increased growth of vegetation |
| (B) | removal of most of the carnivores resulted in an increased population of deer |
| (C) | the length of food chains is generally limited to 3-4 trophic levels due to energy |
| (D) | the length of food chains may vary from 2 to 8 trophic levels |
Which two of the above statements are correct?
1. B and C
2. C and D
3. A and D
4. A and B
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