11.
Of the total incident solar radiation the proportion of PAR is :
A
about 70%
B
about 60%
C
less than 50%
D
more than 80%
Answer :
less than 50%
Discuss Question
No explanation is given for this question. Let's discuss the answer together.
12.
The upright pyramid of number is absent in
A
Pond
B
Forest
C
Lake
D
Grassland
Answer :
Forest
Discuss Question
No explanation is given for this question. Let's discuss the answer together.
13.
The primary succession refers to the development of communities on a
A
fleshly cleared crop field
B
forest clearing after devastating fire
C
pond, freshly filled with water after a dry phase
D
newly-exposed habitat with no record of earlier vegetation
Answer :
newly-exposed habitat with no record of earlier vegetation
Discuss Question
No explanation is given for this question. Let's discuss the answer together.
14.
Which one of the following is not a gaseous biogeochemical cycle in ecosystem ?
A
Sulphur cycle
B
Phosphorus cycle
C
Nitrogen cycle
D
Carbon cycle
Answer :
Phosphorus cycle
Discuss Question
No explanation is given for this question. Let's discuss the answer together.
15.
Bulk $$CO_2$$ fixation occurs in
A
Crop plants
B
Oceans
C
Tropical rain forests
D
Temperature forests
Answer :
Oceans
Discuss Question
No explanation is given for this question. Let's discuss the answer together.
16.
Pheretima and its close relatives derive nourishment from :
A
sugarcane roots
B
decaying fallen leaves and soil organic matter
C
soil insects
D
small pieces of fresh fallen leaves of maize, etc
Answer :
decaying fallen leaves and soil organic matter
Discuss Question
No explanation is given for this question. Let's discuss the answer together.
17.
The correct sequence of plants in a hydrosere is:
A
Volvox → Hydrilla → Pistia → Scirpus Lantana → Oak
B
Pistia → Volvox → Scirpus → Hydrilla → Oak → Lantana
C
Oak → Lantana → Volvox → Hydrilla → Pistia → Scirpus
D
Oak → Lantana → Scirpus → Pistia → Hydrilla → Volvox
Answer :
Volvox → Hydrilla → Pistia → Scirpus Lantana → Oak
Discuss Question
No explanation is given for this question. Let's discuss the answer together.
18.
Most animals that live in deep oceanic waters are:
A
secondary consumers
B
tertiary consumers
C
detritivores
D
primary consumers
Answer :
detritivores
Discuss Question
No explanation is given for this question. Let's discuss the answer together.
19.
Study of inter-relationships between organisms and their environment is
A
ecology
B
ecosystem
C
phytogeography
D
ethology
Answer :
ecology
Discuss Question
No explanation is given for this question. Let's discuss the answer together.
20.
Which of the following does not have stomata?
A
hydrophytes
B
mesophytes
C
xerophytes
D
submerged hydrophytes
Answer :
submerged hydrophytes
Discuss Question
No explanation is given for this question. Let's discuss the answer together.