The upright pyramid of number is absent in
1. Pond
2. Forest
3. Lake
4. Grassland
Identify the likely organisms (a), (b), (c) and (d) in the food web shown below:
Options
(a) |
(b) |
(c) |
(d) |
|
1. |
deer |
rabbit |
frog |
rat |
2. |
dog |
squirrel |
bat |
deer |
3. |
rat |
dog |
tortoise |
crow |
4. |
squirrel |
cat |
rat |
pigeon |
The second stage of hydrosere is occupied by plants like :
1. Azolla
2.Typha
3.Salix
4. Vallisneria
Natural reservoir of phosphorus is :
1. Animal bones
2. Rock
3. Fossils
4.Sea water
Secondary productivity is rate of formation of new organic matter by:
1. Parasite
2. Consumer
3. Decomposer
4. Producer
If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain?
plant → mice → snake → peacock
1. 0.02 J
2. 0.002 J
3. 0.2 J
4. 0.0002 J
Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks.
Options :
A |
B |
C |
D |
|
1. |
Rock minerals |
Detritus |
Litter fall |
Producers |
2. |
Litter |
Producers |
Rock minerals |
Detritus |
3. |
Detritus |
Rock minerals |
Producer |
Litter fall |
4. |
Producers |
Litter fall |
Rock minerals |
Detritus |
Match the following and select the correct option :
(a) Earthworm (i) Pioneer species
(b) Succession (ii) Detrivore
(c) Ecosystem service (iii) Natality
(d) Population growth (iv) Pollination
a b c d
1. (i) (ii) (iii) (iv)
2. (iv) (i) (iii) (ii)
3. (iii) (ii) (iv) (i)
4. (ii) (i) (iv) (iii)
Vertical distribution of different species occupying different levels in a biotic community is known as:
1. Stratification
2. Zonation
3. Pyramid
4. Divergence
The mass of living material at a trophic level at a particular time is called:
1. Standing state
2. Net primary productivity
3. Standing crop
4. Gross primary productivity