Multiple Choice QuestionsWhich one of the following is being tried in India as a biofuel substitute for fossil fuels
Jatropha
Azadirachta
Musa
Musa
A.
Jatropha
Biofuels are substances of biological origin which are used for the production of heat and another form of energy. Often biologically generated hydrogen, methane, ethanol, butanol and diesel are referred to as biohydrogen, biomethane, bioethanol, biobutanol and biodiesel respectively. Petro plans are the plants which can yield a large amount of latex having long chained liquid hydrocarbon, eg, Jatropha, Euphorbia (family-Euphorbiaceae) and other members of Euphorbiaceae, Asclepiadaceae, Apocyanaceae.
The wood used as a source of energy is called fuel wood. The good fuelwood should be free from resin, much smoke and offensive odours. Hardwood is generally good fuel wood, Casuarina, Azadirachta, Dalbergia, Terminalia.
Which one of the following is not used for construction of ecological pyramids?
Dry weight
Number of individuals
Rate of energy flow
Rate of energy flow
Treatment of seed at low temperature under moist conditions to break its dormancy is called
scarification
vernalization
chelation
chelation
Which ecosystem has the maximum biomass?
Forest ecosystem
Grassland ecosystem
Pond ecosystem
Pond ecosystem
Presence of plants arranged into well defined vertical layers depending on their height can be seen best in :
Tropical Savannah
Tropical Rain Forest
Grassland
Grassland
Match the items given in Column I with those in Column II and select the correct option given below :
| Column I | Column II | ||
| a | Eutrophication | i | UV-B radiation |
| b | Sanitary landfill | ii | Deforestation |
| c | Snow blindness | iii | Nutrient enrichment |
| d | Jhum cultivation | iv | Waste disposal |
| a | b | c | d |
| ii | i | iii | iv |
| a | b | c | d |
| i | iii | iv | ii |
| a | b | c | d |
| i | ii | iv | iii |
| a | b | c | d |
| iii | iv | i | ii |
In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen?
Carbon
Cl
Oxygen
Fe
What type of ecological pyramid would be obtained with the following data?
Secondary consumer : 120 g
Primary consumer : 60 g
Primary producer : 10 g
Inverted pyramid of biomass
Pyramid of energy
Upright pyramid of biomass
Upright pyramid of numbers
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