ENVI SCI

• Eutrophication means filling up of water body with aquatic due to extra nourishment
• Biochemical oxygen demand means dissolved O2 needed by microbes to decompose organic waste
• The main components of photochemical smog are oxides of nitrogen
• Deforestation generally decreases rainfall
• Alpha diversity refers to community and ecosystem diversity
• Endemic species are defined as an ecological state of a species being unique to a specific geographic location
• 5th June is observed as World environment day
• The Ecological pyramid that is always upright is the Pyramid of energy
• The most stable ecosystem is the Ocean
• Atmospheric ozone layer which protects us from UV-B & C is getting depleted most by addition of Chlorofluorocarbon
• Important biotic factors that can affect the structure and organization of biological communities are predation, competition, disease
• All of the following statements about ecology are correct except: Ecology is a discipline that is independent from natural selection and evolutionary history
• Detritus food chain starts from dead organic matter
• The term acid rain was coined by Robert Angus Smith
• The damage caused by acid rain is due to corrosive nature of acid rain
• Acid rain reacts with marble and limestone to form calcium sulphate
• The ecological pyramid always starts with the Producer at the base
• Coal is a non-renewable resource
• Chipko movement was started to conserve Forests
• Common to the techniques in vitro fertilization, Cryopreservation, and tissue culture is that all are ex situ conservation methods
• Species diversity includes all the different kinds of living things found in a certain habitat
• Biosphere reserve has the following zones: Core zone, Command zone, Buffer zone
• Conservation of biodiversity outside the natural habitat is called Ex-situ
• Causes of soil erosion include unrestricted grazing, over cultivation, deforestation
• Red data book contains data of Threatened species
• Coral reefs have the maximum diversity
• Zoo is not included under in situ conservation
• Hotspots are regions of high Endemism
• A poisonous gas given out of vehicle's exhaust is Carbon monoxide
• Yellowing of Taj Mahal is an effect of Acid rain
• Pollutants that are easily manageable and decomposable in nature are called Biodegradable pollutants
• BOD stands for Biological oxygen demand
• Kyoto Protocol is an agreement among countries to take steps for reducing global warming
• Greenhouse gases include Methane, Water vapor, Carbon dioxide
• Ozone day is observed on 16th September
• A population is a group of individuals in a species
• Sustainable development means meeting present needs without compromising on future needs
• Energy flow in an ecosystem is Unidirectional
• The upright pyramid of numbers is absent in Forests
• The final stable community in ecological succession is Climax