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
Main cause of eutrophication is
fluctuation of temperature
unusual growth of aquatic vegetations
enrichment of nutrients
abundance of microorganisms
C.
enrichment of nutrients
Eutrophication is the natural aging of lakes whose process starts due to heavy discharge of pollutants. Normally in young like, water is clear and support healthy healthy life, with time due to the enrichment of nutrients such as nitrates and phosphates mainly the industry, sewage, agricultural waste, also waste from home, etc., enters the lakes hinders the aquatic system. This occurs because of overstimulation of growth of algae or algal bloom.
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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