Environmental Engineering

271. 5th June is observed as

1. world forest day
2. world environment day
3. world wildlife day
4. world population day

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272. A graphic representation of number of individuals of different species belonging to each trophic level in a an ecosystem is known as

1. ecological pyramid
2. pyramid of biomass
3. pyramid of number
4. pyramid of energy

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273. A group of individuals of a plant or animal species, inhabiting a given area is called

1. Biome
2. Population
3. Ecosystem
4. Community

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274. A high Biological Oxygen Demand (BOD) indicates that:

1. water is pure
2. absence of microbial action
3. Low level of microbial pollution
4. High level of microbial pollution

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275. A high density of elephant population in an area can result in

1. mutualism
2. Intraspecific competition
3. Interspecific competition
4. Predation on one another

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276. A human population is small, there is a greater chance of:

1. gene flow
2. genetic drift
3. natural selection
4. mutation

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277. A population is a group of

1. individuals in a species
2. species in a community
3. communities in an ecosystem
4. individuals in a family

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278. A river with high BOD value is

1. highly polluted
2. highly clean
3. highly productive
4. none of these

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279. Acid rain contains

1. sulphuric acid
2. nitric acid
3. both a and b
4. sulphuric acid, nitric acid and hydrochloric acid

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280. Air pollution can be of

1. natural origin
2. artificial or man made origin
3. both a and b
4. b only

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