Ecology and Environment

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Snow-blindness in Antarctic region is due to : Answer: 2. Inflammation of cornea due to high dose of UV-B radiation Snow-blindness is inflammation of the cornea caused by a high dose of U... Biodiversity: concept, patterns, importance, loss 1 answer
Montreal protocol was signed in 1987 for control of : Answer: 2. Emission of ozone depleting substances The Montreal Protocol (1987) was an international treaty to control emission of ozone depl... Biodiversity: concept, patterns, importance, loss 1 answer
Match the trophic levels with their correct species examples in grassland ecosystem.(a) Fourth trophic level (i) Crow(b) Second trophic level (ii) Vulture(c) First trophic level (iii) Rabbit(d) Third trophic level (iv) GrassSelect the correct option… Answer: 1. (a) (ii), (b) (iii), (c) (iv), (d) (i) In a grassland food chain: grass (producer, 1st level) - rabbit (primary consumer, 2nd) -... Energy flow and ecological pyramids 1 answer
In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct ? Answer: 2. Gross primary productivity is always more than net primary productivity. Net primary productivity = Gross primary productivity mi... Productivity and decomposition 1 answer
According to Robert May, the global species diversity is about : Answer: 4. 7 million Key idea: Robert May estimated global species diversity at about 7 million. The IUCN figure of described species is abo... Biodiversity: concept, patterns, importance, loss 1 answer
Which of the following regions of the globe exhibits highest species diversity ? Answer: 4. Amazon forests Key idea: The Amazon rainforest has the highest species diversity on Earth. It holds more than 40,000 plant specie... Biodiversity: concept, patterns, importance, loss 1 answer
Which of these following methods is the most suitable for disposal of nuclear waste ? Answer: 4. Bury the waste within rocks deep below the Earth's surface Key idea: Nuclear waste must be stored in a safe, geologically stable... Biodiversity conservation: hotspots, Red Data Book, biosphere reserves, national parks, sacred groves 1 answer
Which of the following is not an attribute of a population ? Answer: 4. Species interaction Key idea: Attributes of a population are properties of the group as a whole, not of individuals or of interac... Population attributes: growth, birth and death rate, age distribution 1 answer
Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for : Answer: 3. construction of roads Key idea: Polyblend, made from recycled modified plastic, is used to lay roads. It is mixed with bitumen to... Biodiversity conservation: hotspots, Red Data Book, biosphere reserves, national parks, sacred groves 1 answer
Which of the following protocols did aim for reducing emission of chlorofluorocarbons into the atmosphere ? Answer: 1. Montreal Protocol Key idea: The Montreal Protocol (1987) controls substances that deplete the ozone layer, mainly CFCs. Kyoto Pro... Biodiversity conservation: hotspots, Red Data Book, biosphere reserves, national parks, sacred groves 1 answer
Which of the following ecological pyramids is generally inverted ? Answer: 4. Pyramid of biomass in a sea Key idea: A pyramid is inverted when producers weigh less than consumers at a given time. In the sea,... Energy flow and ecological pyramids 1 answer
Which of the following pairs of gases is mainly responsible for green house effect ? Answer: 4. Carbon dioxide and Methane The main greenhouse gases are CO₂ , CH₄ , N₂O and CFCs. Among the options, carbon dioxide and methane... Biodiversity: concept, patterns, importance, loss 1 answer
Which of the following is the most important cause for animals and plants being driven to extinction ? Answer: 1. Habitat loss and fragmentation The "evil quartet" lists the causes of biodiversity loss. The most important is habitat loss and f... Biodiversity conservation: hotspots, Red Data Book, biosphere reserves, national parks, sacred groves 1 answer
Which one of the following is not a method of *in situ* conservation of biodiversity ? Answer: 3. Botanical Garden In situ conservation protects species in their natural habitat: biosphere reserves, sanctuaries, national parks... Biodiversity conservation: hotspots, Red Data Book, biosphere reserves, national parks, sacred groves 1 answer
The Earth Summit held in Rio de Janeiro in 1992 was called : Answer: 2. for conservation of biodiversity and sustainable utilization of its benefits. The 1992 Earth Summit at Rio de Janeiro (the UN Con... Biodiversity conservation: hotspots, Red Data Book, biosphere reserves, national parks, sacred groves 1 answer
Match the items given in Column I with those in Column II and select the correct option given below :Column I | Column IIa. Eutrophication | i. UV-B radiationb. Sanitary landfill | ii. Deforestationc. Snow blindness | iii. Nutrient enrichmentd. Jhum… Answer: 2. a-iii b-iv c-i d-ii Key idea: Match each term with its meaning. Eutrophication: nutrient enrichment of water (iii). Sanitary land... Biodiversity: concept, patterns, importance, loss 1 answer
All of the following are included in 'Ex-situ conservation' except Answer: 3. Sacred groves Key idea: Ex-situ conservation means protecting species outside their natural habitat. In-situ means within the nat... Biodiversity conservation: hotspots, Red Data Book, biosphere reserves, national parks, sacred groves 1 answer
In a growing population of a country, Answer: 1. pre-reproductive individuals are more than the reproductive individuals. Key idea: The age pyramid shape shows population growth.... Population attributes: growth, birth and death rate, age distribution 1 answer
Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other ? Answer: 3. *Yucca* Yucca and the moth Pronuba are an obligate mutualism; the moth pollinates the flower and lays eggs in the ovary. Neither... Population interactions: mutualism, competition, predation, parasitism 1 answer
World Ozone Day is celebrated on Answer: 2. 16 ^th September World Ozone Day marks the signing of the Montreal Protocol on 16 September 1987. 5 June is World Environment Day... Biodiversity: concept, patterns, importance, loss 1 answer
In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen ? Answer: 3. Cl UV rays split chlorofluorocarbons and release chlorine atoms, which act as catalysts in converting ozone to molecular oxygen.... Biodiversity: concept, patterns, importance, loss 1 answer
Which of the following is a secondary pollutant ? Answer: 4. O ₃ A secondary pollutant is formed in the air by reactions of primary pollutants; ozone is formed from NO _x and hydrocarbons in... Ecosystem patterns and components 1 answer
What type of ecological pyramid would be obtained with the following data ?Secondary consumer : 120 gPrimary consumer : 60 gPrimary producer : 10 g Answer: 1. Inverted pyramid of biomass A pyramid of biomass is inverted when higher trophic levels have more biomass than lower ones. Here b... Energy flow and ecological pyramids 1 answer
Natality refers to Answer: 3. Birth rate Natality is the birth rate of a population, the number of births per unit time. Death rate is mortality; leaving the h... Population attributes: growth, birth and death rate, age distribution 1 answer

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