Description : Which of the following exhibits unidirectional flow in an ecosystem? (1) Light (2) Energy (3) Water (4) Biomass
Last Answer : (2) Energy Explanation: Ecosystems contain essentially two kinds of commodities: matter (nutrients) and energy. Material nutrients cycle through the biotic and abiotic parts of the ecosystem, available for ... Eventually, all of the energy that enters the ecosystem is lost in the form of heat.
Description : The space retaining life in any form is called (1) Biomass (2) Biosphere (3) Lithosphere (4) Hydrosphere
Last Answer : Biosphere
Description : Source of energy in ecosystem is (1) Sun (2) Green plants (3) Sugar produced in photosynthesis (4) ATP
Last Answer : Sun
Description : Which one of the following is the correct sequence of ecosystem in the order of decreasing productivity? (1) Oceans, mangroves, lakes, grassland (2) Mangroves, oceans, grassland, lakes (3) Oceans, lakes, grassland, mangroves (4) Mangroves, grasslands, lakes, oceans
Last Answer : Mangroves, grasslands, lakes, oceans
Description : Which of the following metals contribute to to biomagnification problem in the ecosystem ? (1) Mercury (2) Chromium (4) Copper (4) Lead
Last Answer : Mercury
Description : What makes an ecosystem ? (1) A living community and its environment (2) All the plants and animals of an area (3) Carnivores and herbivores of an area (4) Producers, consumers and decomposers in a particular locality
Last Answer : A living community and its environment
Description : An ecosystem consists of : (1) producers, consumers and decomposers in a particular area. (2) all the plants and animals of an area. (3) a living community and its environment. (4) carnivorous and herbivorous of an area
Last Answer : a living community and its environment.
Description : Which is the most stable ecosystem ? (1) Desert (2) Ocean (3) Mountain (4) Forest
Last Answer : Ocean
Description : An artificial ecosystem is represented by : (1) pisciculture tank (2) agricultural land (3) zoo (4) aquarium
Last Answer : aquarium
Description : The largest ecosystem of the Earth is (1) Biome (2)Hydrosphere (3) Lithosphere (4)Biosphere
Last Answer : Biome
Description : Pond ecosystem shows (a) Inverted pyramid of number (b) Inverted pyramid of biomass (c) Upright pyramid of biomass (d) Inverted pyramid of energy
Last Answer : Ans. ((b))
Description : Which is the reason for highest biomass in aquatic ecosystem-
Last Answer : Which is the reason for highest biomass in aquatic ecosystem- A. Nanoplankton, blue green algae, ... molds C. Benthonic and brown algae D. Diatoms
Description : Pyramids of biomass in pond ecosystem are
Last Answer : Pyramids of biomass in pond ecosystem are A. Inverted B. Upright C. Linear D. Irregular
Description : Which ecosystem has the maximum biomass? (a) Grassland ecosystem (b) Pond ecosystem (c) Lake ecosystem (d) Forest ecosystem
Last Answer : (d) Forest ecosystem
Description : Which is the reason for highest biomass in aquatic ecosystem? (a) Nano plankton, blue green algae and green algae (b) Sea grass and slime moulds (c) Benthic and brown algae (d) Diatoms
Last Answer : (c) Benthic and brown algae
Description : Which ecosystem has the maximum biomass ? (1) Grassland ecosystem (2) Pond ecosystem (3) Lake ecosystem (4) Forest ecosystem
Last Answer : (4) Forest ecosystem
Description : "Energy flow in a food chain is unidirectional" Justify this statement. -Science
Last Answer : The flow of energy in the ecosystem is said to be unidirectional because the energy lost as heat from the living organisms of a food chain cannot be reused by plants in photosynthesis.
Description : Extensive deserts occur in the western tropical regions of continents because : (1) of easterly trade winds. (2) cold ocean currents flow along the western coasts. (3) of the effect of both the ... winds and cold ocean currents. (4) the rate of evaporation is greater along the western margin areas.
Last Answer : of the effect of both the offshore easterly trade winds and cold ocean currents.
Description : Stars twinkle but planets do not twinkle because (1) they emit light of a constant intensity (2) their distance from the earth does not change with time (3) they are very far away from ... and hence we receive a greater amount of light and therefore minor variations in intensity are not noticeable
Last Answer : they are nearer to the earth and hence we receive a greater amount of light and therefore minor variations in intensity are not noticeable
Description : Light from the Sun reaches us in nearly (1) 8 min (2) 2 min (3) 6 min (4) 4 min
Last Answer : 8 min
Description : The planet emitting green light is (1) Jupiter (2) Venus (3) Uranus (4) Neptune
Last Answer : Uranus
Description : The light from the Sun reaches the Earth in about— (1) 8 seconds (2) 8 minutes (3) 10 seconds (4) 10 minutes
Last Answer : 8 minutes
Description : Check valves are used (A) At high pressure (B) In bends (C) For controlling water flow (D) For unidirectional flow
Last Answer : (D) For unidirectional flow
Description : Check valve is used for __________ flow. (A) Very precise control of (B) Unidirectional (C) Multidirectional (D) None of these
Last Answer : (B) Unidirectional
Description : The _______ is a unidirectional protocol that has no flow or error control. A. Simplest B. Simplex C. TCP/IP protocol D. Simplest or Simplex
Last Answer : D. Simplest or Simplex
Description : Purpose of relief valve in a reciprocating pump is to (A) Protect the pump against developing excessive pressure (B) Facilitate unidirectional flow of liquid (C) Reduce the discharge pressure (D) Control the rate of discharge
Last Answer : (A) Protect the pump against developing excessive pressure
Description : Veins tend to have the following except: a) valves for unidirectional flow b) very elastic walls c) thin walls d) increasing size toward the heart
Last Answer : ANSWER: B -- very elastic walls
Description : It is an unidirectional device that blocks the current flow from cathode to anode (A) SCR (B) PCR (C) VCR (D) DCR
Last Answer : It is an unidirectional device that blocks the current flow from cathode to anode SCR
Description : Energy in the form of heat and light is obtained by________________ a) Biomass b) Fossil fuels c) Sun d) Wind
Last Answer : SUN
Description : The temperature of water at the bottom of a large waterfall is higher than that of the water at the top. because (1) the falling water absorbs heat from the Sun. (2) the water at the bottom has greater ... of the falling water is converted into heat. (4) rocks on the bed of the river give out heat.
Last Answer : the kinetic energy of the falling water is converted into heat.
Description : 'Green House Effect' means (1) Pollution in houses in tropical regions (2) Trapping of solar energy due to atmospheric oxygen (3) Trapping of solar energy due to atmospheric carbon dioxide (4) Cultivation in green houses so as to check pollution
Last Answer : Trapping of solar energy due to atmospheric carbon dioxide
Description : The Montreal Protocol 1987 refers to (1) saving the Bio-diversity of our planet (2) signing of an accord on the peaceful uses of atmoic energy (3) signing of an accord on keeping the antarctica as a nuclear free zone (4) saving the ozone layer from destruction by reducting the use of CFCs
Last Answer : saving the ozone layer from destruction by reducting the use of CFCs
Description : Which one is not a non-conventional energy source? (1) Nuclear energy (2) Solar Energy (3) Wind energy (4) Tidal power
Last Answer : Nuclear energy
Description : The food chain refers to the transfer of energy from : (1) the interior of the earth to the surface (2) lower to higher latitudes (3) one organism to another (4) organisms of the land to those of the sea by means of river
Last Answer : one organism to another
Description : Tides in the sea have stored in them : (1) Hydraulic energy (2) Kinetic energy (3) Gravitational potential energy (4) A combination of all the above three forms of energy
Last Answer : Gravitational potential energy
Description : The solar radiation coming to Earth is called (1) Radiant energy (2) Insolation (3) Sunshine (4) Terrestrial radiation
Last Answer : Insolation
Description : Solar energy is received by the earth through (1) conduction (2) radiation (3) convection (4) refraction
Last Answer : radiation
Description : The well through which water comes out through hydraulic pressure is called (1) Ordinary well (2) Tube well (3) Deep tube well (4) Artesian well
Last Answer : Artesian well
Description : The fur of the animals living in colder regions (1) protects them from water (2) traps the air and keeps them warm (3) protects them from enemies (4) makes them appear beautiful
Last Answer : traps the air and keeps them warm
Description : The word Biosphere refers to : (1) Zone of soil, water and air around earth capable of supporting the flora and fauna. (2) Part of earth surface which can support the flora (3) Parts of air around earth a where life can exist (4) Zone of water on earth which can support life.
Last Answer : Zone of soil, water and air around earth capable of supporting the flora and fauna.
Description : The distribution of characteristic vegetation of a region is determined mainly by (1) soil, water and temperature (2) water, greenhouse effect and altitude (3) wind, water and latitude (4) sunlight, water and wind
Last Answer : soil, water and temperature
Description : Which one of the following is an abiotic and renewable resource? (1) iron ore (2) livestock (3) water (4) forests
Last Answer : water
Description : The sphere of living matter together with water, air and soil on the surface of the earth is known as (1) Lithosphere (2) Biosphere (3) Hydrosphere (4) Atmosphere
Description : The transfer of minerals from top soil to subsoil through soil-water is called? (1) Percolation (2) Conduction (3) Leaching (4) Transpiration
Last Answer : Leaching
Description : The soil water which is of the greatest importance to the plant life is (1) Gravitational water (2) Capillary water (3) Hygroscopic water (4) Combined water
Last Answer : Capillary water
Description : A stretch of sea water, partly or fully separated by a narrow strip from the main sea is called (1) Bay (2) Isthmus (3) Lagoon (4) Strait
Last Answer : Lagoon
Description : A semi enclosed coastal body of water which has a free connection with the open sea is called (1) Estuary (2) Fjord (3) Cove (4) Ria coast
Last Answer : Estuary
Description : The largest reservoir of fresh water is : (1) Glaciers (2) Ground Water (3) Ponds (4) Lakes
Last Answer : Glaciers
Description : How much of world’s surface is covered by water? (1) 55% (2) 70% (3) 80% (4) 25%
Last Answer : 70%
Description : Best way to conserve our water resources : (1) Rain water harvesting (2) Sustainable water utilization (3) Encouragement of natural regeneration of vegetation (4) All of the options mentioned here.
Last Answer : All of the options mentioned here