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

Hydrilla of the plants is hydrophyte.
Hydrilla (water thyme) is a genus of aquatic plants. It is monoecious, with male and female flowers produced separately on a single plant; the flowers are small, with three sepals and three petals, the petals 3 - 5 mm long, transparent with red streaks.
Hydrilla is known to have many digestive and health benefits. The plant contains vitamins, minerals and antioxidants, as well as being useful for fighting indigestion.

Soil conservation is achieved through Good plant cover.
Soil conservation is the prevention of loss of the topmost layer of the soil from erosion or prevention of reduced fertility caused by over usage, acidification, salinization or other chemical soil contamination.
Techniques for improved soil conservation include crop rotation, cover crops, conservation tillage and planted windbreaks, which affect both erosion and fertility.

The cycling of elements in an ecosystem is called Biogeochemical cycle.
A biogeochemical cycle is the 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 (or inorganic molecules for chemoautotrophs) and leaving as heat during the many transfers between trophic levels.

Greenhouse gases include CO₂, CFC, CH₄ and NO₂.
A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range, causing the greenhouse effect.
The primary greenhouse gases in Earth's atmosphere are water vapor (H₂O), carbon dioxide (CO₂), methane (CH₄), nitrous oxide (N₂O), and ozone (O₃). The contribution of each gas to the greenhouse effect is determined by the characteristics of that gas, its abundance, and any indirect effects it may cause.

Biosphere is made of Living beings + Lithosphere + Hydrosphere + Atmosphere.
The biosphere is the global ecological system integrating all living beings and their relationships, including their interaction with the elements of the lithosphere, cryosphere, hydrosphere and atmosphere.
The biosphere is virtually a closed system of matter, with minimal inputs and outputs.

Soil salinity occurs in India to the extent of 6 million ha.
Soil salinity is the number of dissolved salts in the soil solution. The process of accumulating soluble salts in the soil is known as salinization. Salts in the soil have an important effect on the functions and management.
Soil salinity affects around 2.1% of India's geographical area.

The lightest radioactive element is Tritium.
Tritium is a rare and radioactive isotope of hydrogen with a half-life of about 12 years. The nucleus of tritium contains one proton and two neutrons.
Tritium is used as the energy source in radioluminescent lights for watches, gun sights, numerous instruments and tools, and even novelty items such as self-illuminating key chains. It is used in a medical and scientific settings as a radioactive tracer. Tritium is also used as a nuclear fusion fuel, along with more abundant deuterium, in tokamak reactors and hydrogen bombs.

A. CNG ⟶ Compressed Natural Gas
Compressed natural gas (CNG) is a fuel gas mainly composed of methane (CH₄), compressed to less than 1% of the volume it occupies at standard atmospheric pressure. It is stored and distributed in hard containers at a pressure of 20 - 25 megapascals (2,900 - 3,600 psi), usually in cylindrical or spherical shapes.

B. GDP ⟶ Gross Domestic Product
GDP measures the monetary value of final goods and services, that is, those that are bought by the final user produced in a country in a given period. It counts all of the output generated within the borders of a country.

C. GNP ⟶ Gross National Product
The total value of all finished goods and services provided by a country's citizens during a given financial year is known as Gross Nationa product.

D. LPG ⟶ Local Petroleum Gas is not correctly matched.
Liquefied petroleum gas (LPG or LP gas) is a fuel gas that contains a flammable mixture of hydrocarbon gases, specifically propane, propylene, butylene, isobutane and n-butane.

Fluorosis can lead to preventing dental caries.
Fluorosis is a condition that results in white or brown speckles on your teeth. It's caused by overexposure to fluoride in the early years of life, when your permanent teeth are developing.
Fluorosis is a cosmetic concern and isn't harmful to your health. But some treatments can address the issue.

An area of soil thoroughly wetted and allowed to drain till percolation stops will have a water content called Field capacity.
Field capacity is the water content of a soil after gravitational drainage over approximately a day.
The suction that defines this value varies from soil to soil, but is generally in the range of 10 - 33 kPa. Drainable porosity of a soil is defined as the water content between field capacity and saturation.