Multiple Choice QuestionsBiotic factors are :
chemical factors of soil which affect life
physical factors of soil which affect life
all living organisms which influence other organisms
factors of atmosphere which affect life
Which of the following would appear as the pioneer organisms on bare rocks?
Liverworts
Mosses
Green algae
Green algae
Secondary productivity is rate of formation of new organic matter by
producer
parasite
consumer
consumer
During sewage treatment, biogas are produced, which include
methane, hydrogen sulphide and carbon dioxide
methane, oxygen and hydrogen sulphide
hydrogen sulphide, methane and sulphur dioxide
hydrogen sulphide, methane and sulphur dioxide
Which one of the following processes during decomposition is correctly described?
Fragmentation - Carried out by organisms such as earthworm
Humification - Leads to the accumulation of a dark coloured substance humus, which undergoes microbial action at a very fast rate
Catabolism - Last step in the decomposition under fully anaerobic condition
Catabolism - Last step in the decomposition under fully anaerobic condition
A.
Fragmentation - Carried out by organisms such as earthworm
Fragmentation is one of the steps during decomposition, in which detritus is converted into small fragments. Humification leads to a dark coloured amorphous substance called humus that is highly resistent to microbial action and undergoes decomposition at an extremely slow rate.
Catabolism is the set of metabolic pathways that breaks down metabolic pathways that break down molecules into smaller units to release energy. Leaching refers to the loss of water-soluble plant nutrients from the soil due to rain and irrigation
Match the name of the animal (Column I ) with one characteristic (Column II) and the phylum/class (Column III ) to which it belongs
|
Column I |
Column II |
Column III |
|
|
a |
Petromyzon |
Ectoparasite |
Cyclostomata |
|
|
Column I |
Column II |
Column III |
|
b |
Lchthyophis |
Terrestrial |
Reptilla |
|
|
Column I |
Column II |
Column III |
|
c |
Limulus |
Body covered by chitinous exoskeleton |
Pisces |
|
|
Column I |
Column II |
Column III |
|
c |
Limulus |
Body covered by chitinous exoskeleton |
Pisces |
In which of the following both pairs have correct combination?
| Gaseous nutrient cycle | Carbon and Nitrogen |
| Sedimentary nutrient cycle | Sulphur and Phosphorus |
| Gaseous nutrient cycle | Carbon and Sulphur |
| Sedimentary nutrient cycle | Nitrogen and Phosphorus |
| Gaseous nutrient cycle | Nitrogen and Sulphur |
| Sedimentary nutrient cycle | Carbon and Phosphorus |
| Gaseous nutrient cycle | Nitrogen and Sulphur |
| Sedimentary nutrient cycle | Carbon and Phosphorus |
During ecological succession
the gradual and predictable change in species composition occurs in a given area.
the establishment of a new biotic community is very fast in its primary phase.
the number and types of animals remain constant.
the number and types of animals remain constant.
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