Biology 1 Marks Question

1. Air Pollution.
2. particulate matter/dust particles released in the air.

Advantages of CNGi:

1. Burns efficiently/less unburnt residues.
2. Cheaper than petrol/diesel.
3. Causes less pollution.
4. cannot be adulterated.
5. cannot be siphoned by thieves.

1. Allows the catalytic converter to remain active.
2. Reduces air pollution.

Algae called phyto plankton, It flot oc swim in lakes and oceans Green algae may also be found inside fresh water algae not adopt an ocean and deepest strata.

Catalytic converters, having expensive metalls namely platium–Palladium and rhodium as the catalysts, are fitted into automobiles for reducing emission of poisonous gases. The exhaust passes through the catalytic converter, unbrunt hydrocarbons are converted into carbon dioxide and nitrogen gas, respectively; Motor vehicles equipped with catalytic converter should use unleaded petrol because lead in the petrol inactivates the catalyst.

Polluted water/deterioration of the water quality/oxygen depletion/water becomes toxic/BOD increases,
Fish mortality/death of aquatic organism.

High dose of UV-B radiation, inflammation of cornea.

Excessive nutrients result in excessive algal growth/eutrophication/algal bloom/toxins produced by algal bloom; water quality becomes poor/BOD increases/oxygen level decreases.

Pollutants from human activities/effluents from industries/effluents from home/sewage/agricultural (chemical) wastes radically accelerate the ageing process.

Eicchornia crassipes/Water Hyacinth.

It (is an invasive weed) and grows very fast, causes oxygen depletion leading to death of aquatic life or fishes//Eutrophication.

Dobson (Unit)/D.U.

1. Soil erosion.
2. Global warming.

1987.

Noise is defined as undesirable high level of sound.

It develops each year between late August and early October.

The thin layer of ozone around the atmosphere that prevents entry of harmful UV rays in earth’s atmosphere is called ozone shield.

It is due to destruction of habitat of many wild animals.

UV-B radiations.

Methyl Isocyanate.

Strastosphere.

The dissolved salts like nitrates and phosphates.

Electrostatic precipitator.

Oxygen.

Recycling in an environment friendly manner is the best solution for the treatment of electronic wastes.

Euro III norms stipulate the control of sulphur at 350ppm and 150ppm in diesel and petrol, respectively.

Stratosphere.

1. Concentration of the pollutant.
2. Duration of exposure to the pollutant.

• Sulphur dioxide.
• Nitrogen oxides.
• Volatile organic carbons.
• Hydrogen chloride.

Degradation of natural resources occurs due to:

1. Improper resource utilisation practices.
2. Pollutants.

A greenhouse is used to grow plants especially in winter.

Intergovernmental Panel on Climate Change (IPCC).

PM 2.5 refers to the particulate matter, that are 2.5 micrometres or less in diameter.

Fertiliser factory.

Greenhouse effect.

Slash and burn agriculture.

It would increase the size of population of pathogens Mand their vectors.

• High dose of UV-B causes inflammation of cornea, called snow-blindness and also cataract.
• It may permanently damage the cornea.

Addition of polyblend to bitumen enhances water repellant property of bitumen. Thus, it increases road life by a factor of three.

Nitrogen and oxygen.

Its objective is to work closely with the local communities for protecting and managing forests.

Dobson units.

The soil particles carried by water from the source of supply.

2.5 micrometres or less.

Recycled modified plastics and bitumen.