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.

They grow faster than our ability to remove them and cause blocks in our waterways. Their abundant growth leads to an imbalance in the ecosystem dynamics of the waterbody.

1. False.
2. True.
3. False.
4. True.

The plants which can hold a lot of carbon in their biomass are lost due to deforestation; the increased concentration of carbon dioxide in the atmosphere causes global warming.

Faecal matter and bacteria.

Ozone.

Recycled plastic.

1. Electrostatic precipitator.
2. Scrubber.

Pollutants are those substances/ agents which bring about undesirable changes in the properties of air, water and soil, which adversely affect the living organisms

Methyl isocyanate (MIC) and phosgene.

The industrial waste water contains toxic substances like heavy metals and some organic compounds.

• It is found in the stratosphere of the atmosphere.
• Since it acts as a shield to absorb the ultraviolet radiation from the sun, it is called good ozone.

Nitrate, phosphate, metal ions and organic compound.

It is given to individual or community from rural areas that has shown extraordinary courage and dedication for protecting wildlife.

Carbon dioxide and methane.

The excessive growth of algae (free-floating) that causes colouration of water bodies is called algal bloom.

Biochemical Oxygen Demand.

The goal is to reduce sulphur to 50ppm in petrol and diesel and bring down the level to 35ppm.

Global warming refers to the increase in the global mean temperature.

• Soil erosion and desertification.
• Water logging and soil salinity.

Slash and burn culture.

In Jhum cultivation, the farmers cut down the trees of forest and burn the plant remains. The ash is used as fertiliser and land is used for farming. After cultivation the area is left free for several years for recovery. The recovery phase is often ignored leading to deforestation.

There will be no oxides of sulphur in the automobile exhause; oxides of sulphur in the atmosphere cause acid rains.

New Delhi.

2.5 micrometers.

1. Depletion of dissolved oxygen in water.
2. Nutrient enrichment.

Plastic wastes.

In Jhum cultivation, after cultivation, the land/ area is left free for several years to allow its recovery; but with increasing demand for food, and repeated cultivation, the recovery phase is often ignored leading to eforestation.

Acacia and Neem.

Carbon dioxide and methane are the greenhouse gases produced by anaerobic microbes.

Reforestation is the process of restoring a forest that once existed but was removed at some point of time in the past.

Chlorofluorocarbons (CFCs) release Cl atoms when UV rays act on them; Cl degrades the ozone into molecular oxygen.

• Eichhornia crassipes (water hyacinth).
• Eutrophic water bodies.

Depletion of ozone widely in the stratosphere, particularly over the Antarctic region result in formation of thinned ozone layer called ozone hole.

Carbon dioxide and nitrogen.

Biomagnification refers to increase in concentration of the toxicant at successive trophic levels.

1987.

Fertiliser factory.

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

Otherwise lead will inactivate the catalyst.

Delhi.

Nitrate.

The Government of India initiated Amrita Devi Bishnoi award for Wildlife conservation.

Hepatitis-B.

• Biochemical Oxygen Demand.
• Chemical Oxygen Demand.

Sunlight is necessary for ozone degradation and it is available only during spring.

It is increase in concentration of toxicant at successive trophic levels. Toxic substances like mercury or DDT when passed onto next higher level gets accumulated in the food chain.

Pollutants emitted by automobiles are the main sources of air pollution.

Antarctic air circulating over the polar region is called polar vortex.

Greenhouse effect is a naturally occurring phenomenon, in which the shortwave radiations of solar energy are absorbed and longwave radiations are reflected by the earth and is responsible for heating of earth's surface and atmosphere.

Reforestation is the process of restoring a forest, that once existed, but was removed at some point of time in the past.

Cultural/ accelerated eutrophication is a phenomenon of man-induced nutrient enrichment and accelerated ageing of the water bodies.

Hospitals generate hazarduous wastes that contain harmful chemicals, disinfectants and pathogenic microbes; such wastes require disposal using incinerators.

It may rise by 1.4-5.8 °C.

0.1 percent.

Despite being non-polluting, there are great apprehensions in using nuclear energy for generating electricity because of:

1. Danger of accidental leakage.
2. Lack of safe disposal methods of radioactive waste.

Platinum and palladium.

Deforestation is the conversion of forested areas into non-forested ones.