Environment & Biodiversity MCQs

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Plasticulture refers to the practice of using plastic material in agricultural applications. They are also referred to as ag Plastics. Polyethylene (PE) is mostly used by the majority of people due to its easy availability.

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Nanotoxicology is defined as the study of the toxicity of nanomaterials. nanomaterials have unique properties as compared to their larger counterparts because of the large surface area to volume ratio of nanomaterials. Inhalation exposure is of most concern because of its quantum size.

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The species commonly found in Sub-alpine Forests are junipers, birch, rhododendrons,
berberis, maling bamboo, laurel, etc. Oak and magnolia occur around the region of
Kalimpong. In the upper Singalila range, dwarf rhododendrons, meadows and
small flowering bushes occur.

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Dead Animal–Maggots–Frog–Snake is an example of detritus food chain. In such a food chain, Primary consumers are ‘detritivores’ including protozoans, bacteria, fungi, etc which feed upon the detritus (dead organic matter such as fallen leaves, plant parts or dead animal bodies) saprophytically. They are in turn eaten by secondary consumers such as insect larvae, nematodes, etc. In nature, detritus food chains are indispensable as the dead organic matter of grazing food chain is acted upon by the detritivores to recycle the inorganic elements into the ecosystem.

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The three R’s of eco-friendly living are: Reduce, Reuse and Recycle. They all help to cut down on the amount of waste, we throw away. They conserve natural resources, landfill space and energy.

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Reverse osmosis (RO) is a water purification technology that uses a semipermeable membrane to remove ions, molecules, and larger particles from drinking water. It can remove many types of dissolved and suspended species from water, including bacteria, and is used in both industrial processes and the production of potable water (Desalination of marine water). It is most commonly known for its use in drinking water purification plants particularly in countries of middle east.

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According to the US Environmental Protection Agency (EPA), automobile emissions are the number one source of carbon monoxide, lead, nitrogen oxides, and volatile organic compounds released into the atmosphere that are primarily responsible for air pollution. Industrial processes are the number two cause of lead pollution in the air, following automobile emissions.

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The world’s first negative emissions plant under the CarbFix Project to turn atmospheric carbon dioxide (CO2) into stone has begun operations in Hellisheidi, Iceland. It is intended to lock away carbon dioxide by reacting it with basaltic rocks.

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The greenhouse effect is the process by which radiation from a planet’s atmosphere warms the planet’s surface to a temperature above what it would be without its atmosphere. It caused by the presence of water vapour, carbon dioxide, methane, and certain other gases in the air.

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Blowing or moving air is called wind. The speed of wind may vary from 5-10 km/h (gentle breeze) to 700-800 km/h (tornado). The speed and direction of wind is affected by the following factors :

• Location on the earth
• Rotation of the earth
• Local conditions
• Height from the ground