Environment and Ecology Current affairs march
Q. Which part of the world has a high density of organisms? a) deciduous forests b) tropical rain forests c) grasslands d) savannahs.
Answer: b Explanation: Tropical forests are found in trophical zone of the world and are characterized by very high temperature with rainfall in abundance. . Mean monthly temperatures exceed 18 C during all months of the year, due to location near to equator. Sunlight is a major limiting factor.
Q. Biological Oxygen Demand (BOD) is a standard criterion for  (a) Measuring oxygen levels in blood (b) Computing oxygen levels in forest ecosystems (c) pollution assay in aquatic ecosystems (d) Assessing oxygen levels in high altitude regions
Answer: C Explanation: The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water, is called Biochemical Oxygen Demand (BOD). The amount of BOD in the water is a measure of the amount of organic material in the water, in terms of how much oxygen will be required to break it down biologically. Clean water would have BOD value of less than 5 ppm whereas highly polluted water could have a BOD value of 17 ppm or more.
Q. Consider the following statement about Ecotone 1. It is where two communities meet and integrate 2. It is also termed as zone of tension Choose the correct code a) 1 only b) 2 only c) Both d) none
Answer: c Explanation An ecotone is a zone of junction or a transition area between two biomes [diverse ecosystems]. It is where two communities meet and integrate. 'For e.g. the mangrove forests represent an ecotone between marine and terrestrial ecosystem. Other examples are grassland (between forest and desert), estuary (between fresh water and salt water) and river bank or marsh land (between dry and wet) As it is a zone of transition, it has conditions intermediate to the adjacent ecosystems. Hence it is a zone of tension. A well-developed ecotones contain some organisms which are entirely different from that of the adjoining communities.
Q. Which type of association is found in between entomophilous flower and pollinating agent: (a) mutualism (b)Commensalism (c) Cooperation (d) co-evolution
Answer: d Explanation: Coevolution, the process of reciprocal evolutionary change that occurs between pairs of species or among groups of species as they interact with one another. Co-evolution can occur in any interspecific relationship like symbiosis or mutualism. The relation between an entomophilous flower and pollinating insect shows co- evolved mutualism. In this the plant depends exclusively on the insect for pollination and the insect relies on the plant for food
Q. What is a keystone species? (a) a species which makes up only a small proportion of (b) a common species that has plenty of biomass yet has (c) a rare species that has minimal impact on the biomass (d) a dominant species that constitutes a large proportion | the total biomass of a community, yet has a huge impact community's organization a fairly low impact on the community organizations and on other species in the community of the biomass and which affects many
Answer: d Explanation: .It was first established in 1988 by two United Nations organizations, the World Meteorological Organization (WMO) and the United Nations Environment Programme (UNEP) .Membership of the IPCC is open to all members of the WMO and . The IPCC produces reports that support the United Nation:s In accordance with its mandate, the IPCC prepares at regular UNEP Framework Convention on Climate Change (UNFCCC) intervals comprehensive Assessment Reports of scientific, technical and socio-economic information relevant for the understanding of human induced climate change, potential impacts of climate change and options for mitigation and adaptation.
Biotechnology from Bangalore university, currently preparing for civil services...loves singing, writing poems,thoughts and lyrics.....