BIOLOGY 1 Marks Question

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.