Which of the following is not a abiotic component of the ecosystem?

(a)

Bacteria

(b)

Humus

(c)

Organic compounds

(d)

Inorganic compounds

Which of the following is / are not a natural ecosystem?

(a)

Forest ecosystem

(b)

Rice field

(c)

Grassland ecosystem

(d)

Desert ecosystem

Pond is a type of ______.

(a)

forest ecosystem

(b)

grassland ecosystem

(c)

marine ecosystem

(d)

fresh water ecosystem

Pond ecosystem is _______.

(a)

not self sufficient and self regulating

(b)

partially self sufficient and self regulating

(c)

self sufficient and not self regulating

(d)

self sufficient and self regulating

Profundal zone is predominated by heterotrophs in a pond ecosystem, because of ______.

(a)

with effective light penetration

(b)

no effective light penetration

(c)

complete absence of light

(d)

a and b

Solar energy used by green plants for photosynthesis is only ______.

(a)

2 – 8%

(b)

2 – 10%

(c)

3 – 10%

(d)

2 – 9%

Which of the following ecosystem has the highest primary productivity?

(a)

Pond ecosystem

(b)

Lake ecosystem

(c)

Grassland ecosystem

(d)

Forest ecosystem

Ecosystem consists of ____.

(a)

decomposers

(b)

producers

(c)

consumers

(d)

all of the above

Which one is in descending order of a food chain?

(a)

Producers \(\rightarrow \) Secondary consumers \(\rightarrow \) Primary consumers \(\rightarrow \) Tertiary consumers

(b)

Tertiary consumers \(\rightarrow \) Primary consumers \(\rightarrow \)Secondary consumers \(\rightarrow \) Producers

(c)

Tertiary consumers \(\rightarrow \) Secondary consumers \(\rightarrow \) Primary consumers \(\rightarrow \) Producers

(d)

Tertiary consumers \(\rightarrow \) Producers \(\rightarrow \) Primary consumers \(\rightarrow \) Secondary consumers

Significance of food web is / are ______.

(a)

it does not maintain stability in nature

(b)

it shows patterns of energy transfer

(c)

it explains species interaction

(d)

b and c

The following diagram represents

 

(a)

pyramid of number in a grassland ecosystem

(b)

pyramid of number in a pond ecosystem

(c)

pyramid of number in a forest ecosystem

(d)

pyramid of biomass in a pond ecosystem

Which of the following is / are not the mechanism of decomposition

(a)

Eluviation

(b)

Catabolism

(c)

Anabolism

(d)

fragmentation 

Which of the following is not a sedimentary cycle

(a)

Nitrogen cycle

(b)

Phosphorous cycle

(c)

Sulphur cycle

(d)

Calcium cycle

Which of the following are not regulating services of ecosystem services
i) Genetic resources
ii) Recreation and aesthetic values
iii) Invasion resistance
iv) Climatic regulation

(a)

i and iii 

(b)

 ii and iv

(c)

i and ii

(d)

i and iv