- Arrange the following ecosystems in descending order
depending upon the net primary productivity.
(i) Temperate coniferous forest
(ii) Tropical rainforest
(iii) Savannah
(iv) Temperate deciduous forest
(v) Temperate grassland
(a) (ii), (iv), (i), (iii), (v) (b) (i), (ii), (iii), (v), (iv)
(c) (ii), (i), (iii), (iv), (v) (d) (ii), (i), (iv), (v), (iii)
- In case of ecological succession, the climax community is
best represented by
(a) P = R (b) P < R
(c) P > R (d) P ≠ R.
- Select the correct match.
(a) Sedimentary cycle – Nitrogen cycle
(b) Guano deposit – Phosphorus cycle
(c) Hydrosphere – Reservoir pool of carbon
(d) Quercus – Species of woodland stage
- If 40 J energy is trapped at producer level, then what amount
of energy will be available to hawk as in the given food chain?
Plant → Caterpillar → Sparrow → Hawk
(a) 0.0004 J (b) 0.04 J (c) 4 J (d) 0.004 J
- Read the given statements and select the correct option.
Statement A : Maximum productivity occurs in coral reefs
and estuaries.
Statement B : Both the ecosystems, coral reefs and
estuaries have rich nutrient supply.
(a) Both statements A and B are correct and B is the correct
explanation of A.
(b) Both statements A and B are correct but B is not the
correct explanation of A.
(c) Statement A is correct but statement B is incorrect.
(d) Both statements A and B are incorrect.
- A zooplankton is living in an aquatic ecosystem. What will
be its trophic level?
(a) T 1 (b) T 2 (c) T 3 (d) T 4
- Which of the following ecosystems has maximum
stratification?
(a) Grassland (b) Desert
(c) Tropical rainforest (d) Orchard
- In an aquatic ecosystem, the food chain starts from
(a) phytoplankton (b) zooplankton
(c) small fish (d) roaches.
- Select the correct statement.
(a) Carbon cycle is imperfect cycle while phosphorus cycle
is perfect cycle.
(b) Ten percent law was proposed by Odum in 1942.
(c) Grazing food chain helps in releasing inorganic
nutrients to the cycling pool.
(d) Seral community is a transitional community which
develops in an area during succession.
- Consider the following statements (A - D) and select the
option which correctly fills the blanks.
A. A group of species belonging to a trophic level which
exploits a common resource base in a similar fashion is
known as (i).
B. (ii) reduces decomposition and causes piling up of
detritus.
C. In oceans productivity is limited by (iii) and (iv).
D. Largest reservoir of calcium is (v).
(i) (ii) (iii) (iv) (v)
(a) fugitive
species
Temperature light oxygen atmosphere
(b) guild Anaerobiosis light nitrogen lithosphere
(c) fugitive
species
Temperature oxygen nitrogen lithosphere
(d) guild Anaerobiosis light oxygen atmosphere
- Identify organisms A, B, C and D in the given food web.
(A) (B)
Foxes
Tiger
Snakes
Hawks
(C)
Grasshopper
Grasses / Seeds
(D)
Garden
lizard
