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51.

First steps in biogas generation isA. Aerobic hydrolysis of polymersB. Anaerobic hydrolysis opf polymersC. Conversion of momimers into organic acidsD. Conversion of organic acids into monomers

Answer» Correct Answer - B
Discussion
52.

A major pest eradicated through release of sterile males isA. Screw wormB. AphidsC. LadybugD. Praying Mantis

Answer» Correct Answer - A
A large number of sterile males are released which mate without producing offspring e.g., screw worm (Kiplings 1955).
Discussion
53.

A bad fire wood is that ofA. DalberigaB. BauhiniaC. LagersroemiaD. Terminalia

Answer» Correct Answer - B
Discussion
54.

The plant which is not a component of energy cropping isA. SugarcaneB. Sugar BeetC. TapiocaD. Euphorbia

Answer» Correct Answer - D
Discussion
55.

Biogas mainly consist ofA. EthaneB. `CO_(2)`C. `H_(2)`D. Methane

Answer» Correct Answer - D
Discussion
56.

What is meant by energy crop?

Answer»
  • Some plants are used as raw material for the production of ethanol.
  • Example: sugarcane, sugarbeet, potato, maize, turnip etc. 
  • These plants are called as energy plants and their cultivation is called an energy crop
Discussion
57.

What is Petro farming?

Answer»
  • Some plants are used to obtain biodiesel to be used in place of diesel/petrol. 
  • These are called as petrol plants. Their cultivation is called a Petro crop
Discussion
58.

Pyrolysis of wood yieldsA. Wood alcoholB. Wood gasC. Pyroligneous acidD. All the above

Answer» Correct Answer - D
Discussion
59.

Which one is a petroplant?A. Cicer arietinumB. Beta vulgarisC. Euphobia lathyrusD. Salanum tuberosum

Answer» Correct Answer - C
Discussion
60.

Who showsed that certain plants can function as a source of hyfdrocarbonsA. Melvbin calvinB. HanskrebsC. Robert BrownD. John Priestely

Answer» Correct Answer - A
Discussion
61.

The first petroplant discovered by Calvin wasA. Copaifera longsdorfeeB. Euphorbia lathyrusC. JatrophaD. Calotropis

Answer» Correct Answer - B
Discussion
62.

In which of the foloing forms animal energy is availablegtA. HMP andDAPB. Animal wastedC. Fossil fuelsD. Biofuels

Answer» Correct Answer - A
Discussion
63.

Bioenergy is the energy obtained fromA. CoalB. Natural gasC. BiomassD. Petroleum

Answer» Correct Answer - C
Discussion
64.

Types of bioenergy areA. Animal anergyB. Solar energyC. Animal energy and fossil fuelsD. Animal energy and biofuels

Answer» Correct Answer - D
Discussion
65.

Producer gas containsA. C`CO_(2)+H_(2)`B. `CO_(2)+CH_(4)`C. `CO++H_(2)`D. `CO+CH_(4)`

Answer» Correct Answer - C
Discussion
66.

Producer gas is formed by passing over hot biomassA. SteamB. AirC. HydrogenD. Both A and B

Answer» Correct Answer - D
Discussion
67.

Producer gas is got through the process ofA. FermentationB. CombustionC. PyrolysisD. Carbonisation

Answer» Correct Answer - B
Discussion
68.

Wood gas is used asA. Fuel gasB. Source of alcoholC. Source of oilD. Source of ammonia

Answer» Correct Answer - A
Discussion
69.

Raw material used in formation of producer gas isA. Saw dust and wood chipsB. Crops residueC. Agroindustry wastedD. All the above

Answer» Correct Answer - D
Discussion
70.

Most of the petrocrops belong to familyA. LeguminosaeB. RutaceaeC. EuphorbiaceaeD. Malvaceae

Answer» Correct Answer - C
Discussion
71.

Besides dung the weed which can be used in biogs production isA. HydrillaB. Salanum nigrumC. Eichhorinaia crassipesD. Parthenium hysterophorus

Answer» Correct Answer - C
Discussion
72.

VAM is important forA. Breaking of dormancyB. Phosphate nutritionC. Water uptakeD. Retarding flowering

Answer» Correct Answer - B
VAM has significant role in phosphate nutrition of plants.
Discussion
73.

Leghaemoglobin takes part inA. Energy releaseB. Stimulating growth of RhizobiumC. `N_2` absorptionD. Protecting nitrogenase

Answer» Correct Answer - D
The nodule cells have pigment called leghaemoglobin. The fixation of nitrogen is brought about by the enzyme nitrogenase are those nodules where leghaemoglobin is not produced cannot fix nitrogen.
Discussion
74.

The technology of biogas production was developed in India through the efforts ofA. KVICB. IARIC. Both A and BD. WHO

Answer» Correct Answer - C
Discussion
75.

Which wood is more suitable for fuel?A. Hard woodB. High calorific valueC. Highly combustibleD. All the above

Answer» Correct Answer - D
Discussion
76.

Biogas produced by anaerobic fermentation of water biomass consists ofA. MethaneB. Traces of `H_2,H_2S` and `N_2`C. `CO_2`D. All of these

Answer» Correct Answer - D
Result of anaerobic fermentation of animal dung produces gobar gas.
Discussion
77.

Sap of which plant is considered as a good substitute for diesel oilA. Euphorbia spB. Copaifera longsdorfiiC. Calotropis proceraD. Manihot glaziovii

Answer» Correct Answer - B
Copaifera langsdorffii / Brazilian tree and its sap is good alternative for diesel. About 3 litres of sap per month produced per tree.
Discussion
78.

Biogas is a mixture ofA. `CO+H_2+CO_2`B. `CH_4+CO+CO_2`C. `CH_4+CO_2+H_2`D. `CO+CO_2+NO_2`

Answer» Correct Answer - C
Biogas / Gobar gas production by anaerobic respiration & fermentation of animal dung. Which consists 50-70% `CH_4`, 30-40% `CO_4`, 1% `H_2S` and trace `H_2, N_2, O_2`.
Discussion
79.

An ideal good fuelwood is obtained fromA. Bauhinia racemosaB. Dalbergia sissooC. Michelia excelsaD. Mangifera indica

Answer» Correct Answer - B
Good fuel wood are easy to dry, quickly catch fire, having good flame with high calorific value, e.g Albizia, Casuarina, Hopea, Dalbergia sissoo etc
Discussion
80.

Energy obtained from living organisms/biological factors is? (a) Bioenergy (b) Biofuel (c) Mechanical Energy (d) Biomass

Answer»

The answer is (a) Bioenergy
Discussion
81.

Azotobacter and Bacillus polymyxa areA. DecomposersB. Nonsymbiotic nitrogen fixersC. Symbiotic nitrogen fixersD. Pathogenic bacteria

Answer» Correct Answer - B
Azotobacter and Bacillus polymyxa are free living or non-symbiotic nitrogen fixing bacteria of soil, which increase fertility of soil and hence yield of crop plants.
Discussion
82.

Antifeedant property occurs inA. NicotineB. AzadirachtinC. RotenoneD. Cinerin

Answer» Correct Answer - B
Neem extracts contain an antifeedant compound azadirachtin which keeps way the insects.
Discussion
83.

Leghaemoglobin occurs inA. Coralloid rootB. BGAC. Around bacteriodsD. Mycorrhiza

Answer» Correct Answer - C
A root nodule has a growing point, vascular strand and reddish pigment leghaemoglobin but lacks root cap and root hair. Its central infection zone has large cells with groups of bacteroides covered by membrane lined by leghaemoglobin.
Discussion
84.

Cochineal insect has been used in checking the wild growth ofA. OpuntiaB. EichhorniaC. AphidsD. Screw worm

Answer» Correct Answer - A
In India and Australia, prodigious spread of prickly pear (opuntia) was controlled by introduction of cochineal insects (Cactoblastis cactorum).
Discussion
85.

What is Biodiesel?

Answer»

Seeds of many plants such as of Soyabean, Mustard, Castor, Flaxseed, Sunflower, Groundnut, Jatropha, Pongamia (Karen) have an adequate amount of lipids and fatty acids. These lipids contain a tremendous amount of energy. When esterification of fatty acids present in lipids is done a liquid is formed which is known as biodiesel.
Discussion
86.

Biological control of pest isA. PollutingB. Highly expensiveC. Self perpetuating D. Toxic

Answer» Correct Answer - C
The control organism which parasitises/preys upon/ inhib the target pest, multiplies itself and is, hence, self perpetuating.
Discussion
87.

Last step in biogas production is carried out byA. Decomposer microbesB. Fermentative microbesC. MethanogensD. Thermoacidop[hiles

Answer» Correct Answer - C
Discussion
88.

Write the importance of Biodiesel

Answer»

Biodiesel acts as a lubricant as a result efficiency of the engine is increased and the cost of maintenance is reduced. 

  • By using this biodiesel, carbon monoxide and suspended particles in the exhaust are comparatively less. 
  • This is an important source of alternative sources of energy and can lead to employment, increasing income etc. 
  • Biodiesel may prove effective in economic stability and development in our country as these plants can be grown on barren land, near the roadside and non irrigated lands.
Discussion
89.

Biological control of pest isA. PollutingB. Highly expensiveC. Self perpetuatingD. Toxic

Answer» Correct Answer - C
The control organism which parasitises/preys upon/ inhib the target pest, multiplies itself and is, hence, self perpetuating.
Discussion
90.

The phenomenon of using a predator for controlling a pest isA. Biological controlB. Genetic engineeringC. Artificial controlD. Confusion technique

Answer» Correct Answer - A
Predators is example of biological control and lady bug (lady bird beetle) and praying mantis can control scale insect or aphid pests of vegetables.
Discussion
91.

Producer gas is used forA. Manufactrure of ammoniaB. Industrial fuelC. Running certain enginesD. All the above

Answer» Correct Answer - C
Discussion
92.

Apertroleum plant isA. SurgarcaneB. MaizeC. PotatoD. Euphorbia

Answer» Correct Answer - D
Discussion
93.

Bioenergy is obtained fromA. PetroleumB. Natural gasC. BiomassD. Synthetic fuel

Answer» Correct Answer - C
Discussion
94.

Which one is equivalent to petroleum hydrocarbons?A. ResinB. LatexC. GumD. Tannin

Answer» Correct Answer - B
Discussion
95.

A petroleum plant isA. SugarcaneB. MaizeC. PotatoD. Euphorbia

Answer» Correct Answer - D
Discussion
96.

Which one contains hydrocarbbons similar to those of petroleum?A. TanninB. StarchC. LatexD. Resin

Answer» Correct Answer - C
Discussion
97.

What are the salient features of fuelwood?

Answer»

The fuelwood should have – 

  • High combustion efficiency. 
  • High-calorie value. 
  • It should not break and degrade into small pieces on burning. 
  • Less water and resin content so that can be easily dried. 
  • On burning, produces less smoke and no odour.
Discussion
98.

A better fuel wood isA. Dicotyledonous hardwoodB. Dicotyledonous softwoodC. Monocotyledonous softwoodD. Resinous gymnnospermous wood

Answer» Correct Answer - A
Discussion
99.

Biogas production is rate limited byA. Production of methaneB. Cellulose digestionC. Conversion of momimers into organic acidsD. of monomers to organic acids

Answer» Correct Answer - B
Discussion
100.

The main energy containing components of biogas isA. MethaneB. HydrogenC. Hydrogen suplhideD. Carbon dioxide

Answer» Correct Answer - A
Discussion