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

To sustain life on earth, the things required are none of the given options.
We must have food, water, air, and shelter to survive. It regulates the temperature of water bodies, weather patterns and provides energy to the growth of plants. The distance of the Earth from the Sun makes it a perfect reason for life because it receives the perfect amount of heat and light to allow life to be created and to support it.

Respiration, Photosynthesis and Fossil fuel combustion contribute to the carbon cycle.
Terrestrial plants fix atmospheric CO₂ through photosynthesis, returning a fraction to the atmosphere through respiration.
Carbon dioxide is removed from the atmosphere primarily through photosynthesis and enters the terrestrial and oceanic biospheres.
Burning fossil fuel also releases large amounts of gases along with carbon dioxide.

The photochemical smog is formed by solar radiations upon nitrogen oxides and hydrocarbons.
Summer smog is primarily associated with the photochemical formation of ozone. During the summer season when the temperatures are warmer and there is more sunlight present, photochemical smog is the dominant type of smog formation.
These pollutants react in the atmosphere with sunlight to form secondary pollutants that also combine with the primary emissions to form photochemical smog.

Water soaked appearance of leaves due to sulphur dioxide pollution is caused by Destruction of chlorophyll and Damage to members.
It is known to affect chlorophylin in its high concentration, so high concentration of sulphur dioxide, destroys chlorophyll by eliminating the pital group of chlorophyll.
It refers to any one of a group of closely related water-soluble salts that are semi-synthetic derivatives of chlorophyll, differing in the identity of the cations associated with the anion.

Branch of Biology dealing with distribution of plants and animals on earth's surface and their inter-relationship is termed Ecology.
It is the study of the relationships among living organisms, including humans, and their physical environment. Ecology considers organisms at the individual, population, community, ecosystem and biosphere levels.

The impacts caused by construction of dams and reservoirs include Soil erosion, Loss of vegetation cover and Change in microclimate.
The environmental impact of reservoirs comes under ever-increasing scrutiny as the global demand for water and energy increases and the number and size of reservoirs increases.
The construction of a dam blocks the flow of sediment downstream, leading to downstream erosion of these sedimentary depositional environments, and increased sediment build-up in the reservoir.
Reservoirs may contribute to changes in the Earth's climate. Warm climate reservoirs generate methane, a greenhouse gas when the reservoirs are stratified, in which the bottom layers are anoxic, leading to degradation of biomass through anaerobic processes.

Greenhouse effect was discovered by Tyndall.
He made discoveries in the realms of infrared radiation and the physical properties of air, proving the connection between atmospheric CO₂ and what is now known as the greenhouse effect in 1859.
The greenhouse effect is how heat is trapped close to Earth's surface by "greenhouse gases". These heat-trapping gases can be thought of as a blanket wrapped around Earth, keeping the planet toastier than it would be without them.

Carbon-dioxide is not a pollutant normally.
Carbon dioxide is not considered an air pollutant, as it occurs naturally in the air. However, the CO₂ concentration in the atmosphere has significantly increased due to human activity. Carbon dioxide is a greenhouse gas; alongside nitrous oxide (N₂O), and methane (CH₄).
Carbon dioxide in the atmosphere warms the planet, causing climate change. Human activities have raised the atmosphere's carbon dioxide content by 50% in less than 200 years.

The largest reservoir of phosphorus in the biosphere is the Rocks.
Phosphorite, phosphate rock or rock phosphate is a non-detrital sedimentary rock that contains high amounts of phosphate minerals.
The phosphate content of phosphorite (or grade of phosphate rock) varies greatly, from 4% to 20% phosphorus pentoxide (P₂O₅). Areas of oceanic upwelling cause the formation of phosphates.

The other two states other than states of matter (gas, liquid and solid) are Plasma and Hb.
Matter in the plasma state has variable volume and shape and contains neutral atoms as well as a significant number of ions and electrons, both of which can move around freely.
Plasma does not have definite shape or volume. Unlike gases, plasmas are electrically conductive, produce magnetic fields and electric currents, and respond strongly to electromagnetic forces. A gas is usually converted to a plasma in one of two ways, either from a huge voltage difference between two points, or by exposing it to extremely high temperatures.