Multiple Choice QuestionsSecondary productivity is rate of formation of new organic matter by
producer
parasite
consumer
decomposer
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
Leaching - Water soluble inorganic nutrients rise to the top layers of soil
A.
Fragmentation - Carried out by organisms such as earthworm
Fragmentation is one of the step of decomposition. In this, detritus is converted into small fragments.
Humification leads to 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 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.
Main cause of eutrophication is
fluctuation of temperature
unusual growth of aquatic vegetations
enrichment of nutrients
abundance of microorganisms
Two related but geographically isolated species are known as
sibling species
sympatric species
taxonomic species
allopatric species
The animal species controlling the ecosystem functioning is known as
edge species
pioneer species
keystone species
umbrella species
Match the items in column I with those in column II and choose the correct answer.
| Column I | Column II |
| A. Thiobacillus | 1. Nitrogen- fixation |
| B. Nitrosomonas | 2. Ammonification |
| C. Azotobacter | 3. Nitrification |
| D. Pseudomonas | 4. Denitrification |
A- 4; B- 3; C- 1; D- 2
A- 3; B- 4; C- 1; D- 2
A- 4; B- 2; C- 1; D- 3
A- 2; B- 1; C- 3; D- 4
Match the following column I with column II.
| Column I | Column II |
| A. Pollen grains | 1. Photochemical smog |
| B. PAN | 2. Particulate pollution |
| C. CO2 | 3. Global warming |
| D. Cadmium | 4. Itai- itai disease |
A- 2; B- 1; C- 3; D- 4
A- 4; B- 2; C- 1; D- 3
A- 1; B- 2; C- 3; D- 4
A- 3; B- 1; C- 2; D- 4
Match the following column I with column II
| Column I | Column II |
| A. Cytology | 1. Study of fossils |
| B. Entomology | 2. Study of cells |
| C. Palaentology | 3. Study of birds |
| D. Ornithology | 4. Study of insects |
A- 2; B- 3; C- 4; D- 1
A- 2; B- 4; C- 1; D- 3
A- 1; B- 2; C- 4; D- 3
A- 3; B- 2; C- 1; D- 4
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