CBSE
Multiple Choice QuestionsIn 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 |
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 |
Biotic 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 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
Natural reservoir of phosphorus is
sea water
animal bones
rock
rock
The term ecosystem was coined by
AG Tansley
E Haeckel
E Warrning
E Warrning
Which of the following would appear as the pioneer organisms on bare rocks?
Liverworts
Mosses
Green algae
Green algae
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.
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
Secondary productivity is rate of formation of new organic matter by
producer
parasite
consumer
consumer
