A B C D
(a) Squirrel Dog Tortoise Crow
(b) Rat Cat Bat Pigeon
(c) Deer Squirrel Rat Crow
(d) Deer Rabbit Frog Rat
- Changes during the process of ecological succession in
communities are
(a) quick (b) orderly and sequential
(c) random (d) none of these.
- Select the incorrect statement.
(a) Oligotrophic state of lake succession is the succession
occurring on nutrient poor medium.
(b) Pioneer community is best described as stable and self
perpetuating biotic community.
(c) Eutrophic state of lake succession is characterised by
nutrient rich medium and organic matter.
(d) Lithosere refers to sequence of successional stages on
bare rock.
- Choose the correct sequence of biotic succession for
hydrosere.
(a) Phytoplankton → Floating stage → Submerged stage
→ Sedges → Reed swamp stage → Bushes → Trees
(b) Zooplankton → Floating stage → Submerged stage
→ Reed swamp stage → Sedges → Bushes → Trees
(c) Phytoplankton → Zooplankton → Submerged stage
→ Floating stage → Reed swamp stage → Sedges →
Bushes → Trees
(d) Zooplankton → Submerged stage → Floating stage
→ Sedges → Reed swamp stage → Bushes → Trees
- Which of the following is not an ecosystem service provided
by a natural ecosystem?
(a) Carbon fixation (b) Pollination of flowers
(c) Prevention of soil erosion
(d) Aboriculture
- Select the correct statement regarding xerosere.
(a) It is the ecological succession on bare rocks that are
water deficient but rich in organic matter.
(b) Crustose lichens such as Parmelia and Dermatocarpon
are the pioneer community in a xerosere.
(c) Hypnum and Tortula constitute the annual grass stage
of xerosere.
(d) Zizyphus and Capparis constitute shrub stage of
xerosere.
- The circulation of the essential nutrients between living and
non-living components of biosphere is termed as
(a) biogeographic cycle (b) cycling of minerals
(c) biological cycle (d) biogeochemical cycle.
- Refer to the given figure showing single channel energy flow
model.
Sunlight
(Energy not used)
(Energy not
assimilated)
Heat loss
Herbivores Carnivores
Producers
GPP
R R
T 1 T 2 T 3
R
NU NA NANU
I
What fraction of gross productivity/assimilated energy is
utilised in respiration by producers (i), herbivores (ii) and
carnivores (iii)?
(i) (ii) (iii)
(a) 20% 30% 60%
(b) 10% 20% 30%
(c) 10% 5% 1%
(d) 20% 40% 80%
- Select the wrong statement regarding carbon cycle.
(a) Oceanic water can retain upto 50 times of CO 2 levels in
the air.
(b) The only major reservoir of carbon in the biosphere is lake.
(c) Volcanic eruptions, hotsprings, burning of fossil fuel and
weathering add carbon dioxide into the atmosphere.
(d) The recycling of carbon is a self regulating feed back
system.
- Read the following statements.
(i) Removal of tigers from an area will result in increased
growth of vegetation of that area.
(ii) Grazing food chain is the major conduit of energy flow
in aquatic ecosystem.
(iii) Food chains are sustained by producers and decomposers.
(iv) In a food chain, some organisms like hen operates at
one trophic level only.
Select an option which shows correct statements.
(a) (i) and (ii) (b) (ii) and (iv)
(c) (ii) and (iii) (d) (i), (iii) and (iv)
Key is published in this issue. Search now!
Check your score! If your score is
> 90% EXCELLENT WORK! You are well prepared to take the challenge of final exam.
90-75% GOOD WORK! You can score good in the final exam.
74-60% SATISFACTORY! You need to score more next time.
< 60% NOT SATISFACTORY! Revise thoroughly and strengthen your concepts.
No. of questions attempted ......
No. of questions correct ......
Marks scored in percentage ......
