Environmental Science In Agricultural MCQ Question and Answer | Agriculture MCQ Question

Sewage treatment in which a portion of decomposer bacteria present in waste is recycled into the beginning of the process known as Activated sludge treatment.
The activated sludge process is a type of biological wastewater treatment process for treating sewage or industrial wastewater using aeration and a biological floc composed of bacteria and protozoa. It uses air (or oxygen) and microorganisms to biologically oxidize organic pollutants, producing a waste sludge containing the oxidized material.

Guano is a major source of Phosphorus.
Guano is the accumulated excrement of seabirds or bats. Guano is a highly effective fertilizer due to its high content of nitrogen, phosphate, and potassium, all key nutrients essential for plant growth.
It contains plant nutrients including nitrogen, phosphorus, calcium and potassium.

Soil structure is an indirect ecological factor.
Ecological factor or eco factor is any factor, abiotic or biotic, that influences living organisms.
Abiotic factors include ambient temperature, amount of sunlight, and pH of the water soil in which an organism lives.
Biotic factors would include the availability of food organisms and the presence of biological specificity, competitors, predators and parasites.

Counter current flow of scrub solution and the gas stream is effective in trapping Liquid substances, Gaseous substances and all kinds of pollutants.
The HEIL Series Vertical Countercurrent Scrubber is designed specifically for the efficient removal of corrosive, noxious and/or nuisance gases from process or ventilation air streams.
Traveling a tortuous route through the packing extends the contact time between the air and the liquid and increases the intimacy of gas/liquid contact. The gas then passes through the liquid spray above the packing.

Phenolpthalein alkalinity is also known as Carbonate alkalinity.
The alkalinity in a water sample is measured by the amount of standard acid required to lower the pH to a level of 8.3, as indicated by the change in colour of phenolphthalein from pink to clear.
Phenolphthalein alkalinity is determined by titration to a pH of 8.3 and indicates the total hydroxide and half the carbonate present.

Major aerosol pollutant in jet plane emission is Fluorocarbon.
Fluorocarbons are fluorinated carbon chain polymers that are used in an assortment of household and commercial products as waterproofing agents, lubricants, sealants, and leather conditioners.
Aircraft emissions vary with the engine type and the kind of fuel. Aircraft jet engines directly emit aerosol particles and condensable gases such as water vapor (H₂O), sulfuric acid and organic compounds, which lead to the formation of new, liquid (volatile) particles in the early plume by gas-to-particle conversion (nucleation) processes.

Biogeochemical cycling means cycling of nutrients in an ecosystem.
A biogeochemical cycle is a pathway by which a chemical substance cycles the biotic and the abiotic compartments of Earth.
The biotic compartment is the biosphere and the abiotic compartments are the atmosphere, hydrosphere and lithosphere.
Energy flows directionally through ecosystems, entering as sunlight and leaving as heat during the many transfers between trophic levels.

National Biodiversity Strategy and Action Plan (NBSAP) was established in 2004.
This National Biodiversity Strategy and Action Plan (NBSAP) is a nationwide sectoral document aiming to promote the conservation of biodiversity, sustainable use of natural resources and equitable sharing of the benefits of biodiversity in the State of Qatar.
It contains 11 Strategic Goals that identify the most pressing biodiversity issues in the country. Each of these goals is supported by an action plan that is composed of a series of proposed short-term and long-term activities that can be developed into practical projects.

The correct sequence of carbon cycle is Photosynthesis ⟶ Consumer ⟶ Decomposers.
The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of Earth.
Carbon dioxide is removed from the atmosphere primarily through photosynthesis and enters the terrestrial and oceanic biospheres through consumers and decomposers ultimately.

The market value in current rupees or dollars of all goods and services, for final use, produced by an economy during a year is Gross National Product (GNP).
It is the total domestic and foreign output claimed by residents of a country, consisting of gross domestic product (GDP), plus factor incomes earned by foreign residents, minus income earned in the domestic economy by non-residents.
Gross national product (GNP) is the market value of all the goods and services produced in one year by labour and property supplied by the citizens of a country.