Biology Objective Questions and Answers: Biodiversity and Its Conservation
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Multiple Choice Questions
(a) conversion of sterile soil into fertile one
(b) aeration of soil
(c) erosion of soil
(d) protection against loss
Show Answer & Explanation
Answer: (d) protection against loss
Explanation:
1. Soil conservation means protecting soil against loss by erosion and keeping its fertility.
Teacher's Note:
1. Methods include terracing and afforestation.
2. Conservation is protection from loss.
(a) soil erosion
(b) land slides
(c) soil fertility
(d) rainfall
Show Answer & Explanation
Answer: (d) rainfall
Explanation:
1. Forests bring rain by transpiration and cloud formation, so deforestation reduces rainfall and raises soil erosion.
Teacher's Note:
1. Roots bind the soil.
2. Less forest, less rain.
(a) non-renewable non-conventional energy source
(b) non-renewable conventional energy source
(c) renewable non-conventional energy source
(d) renewable conventional energy source
Show Answer & Explanation
Answer: (c) renewable non-conventional energy source
Explanation:
1. Geothermal energy comes from heat within the earth and is renewed continuously, so it is a renewable non-conventional source.
Teacher's Note:
1. Coal and oil are non-renewable conventional sources.
2. Geothermal is renewable.
(a) biomass
(b) coal
(c) petroleum
(d) kerosene
Show Answer & Explanation
Answer: (a) biomass
Explanation:
1. Biomass can be regrown, so it is renewable. Coal, petroleum and kerosene are fossil fuels.
Teacher's Note:
1. Fossil fuels take millions of years to form.
2. Biomass is renewable.
(a) synthetic product
(b) renewable resource
(c) non-renewable resource
(d) inconvenient resource
Show Answer & Explanation
Answer: (c) non-renewable resource
Explanation:
1. Petroleum formed over millions of years from buried organisms and cannot be replaced quickly, so it is non-renewable.
Teacher's Note:
1. It is a fossil fuel.
2. Petroleum is non-renewable.
(a) biodegradable resources
(b) renewable
(c) non-renewable
(d) Both
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Answer: (c) non-renewable
Explanation:
1. Minerals and metals are formed over geological time and cannot be renewed, so they are non-renewable.
Teacher's Note:
1. They are also non-biodegradable.
2. Minerals are non-renewable.
(a) non-degradable, non-maintainable
(b) degradable, maintainable
(c) renewable
(d) non-renewable
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Answer: (c) renewable
Explanation:
1. Water is renewed through the water cycle, so it is a renewable resource.
Teacher's Note:
1. Pollution can still make it unusable.
2. Water is renewable.
(a) crop rotation
(b) nitrogen-fixing bacteria
(c) decaying organic matter
(d) intensive agriculture
Show Answer & Explanation
Answer: (d) intensive agriculture
Explanation:
1. Intensive agriculture removes nutrients without return, which lowers soil fertility. Crop rotation and nitrogen fixers restore it.
Teacher's Note:
1. Organic matter adds humus.
2. Intensive farming drains the soil.
(a) Cyperus rotundus
(b) Eichhornia crassipes
(c) Trapa latifolia
(d) Trapa bispinosa
Show Answer & Explanation
Answer: (b) Eichhornia crassipes
Explanation:
1. Eichhornia crassipes (water hyacinth), native to America, spreads rapidly and chokes Indian water bodies.
Teacher's Note:
1. It is called the terror of Bengal.
2. Water hyacinth is a water weed.
(a) Kaziranga
(b) Ranthambore
(c) Corbett
(d) Valley of flowers VERSITY AND CONSERVATION
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Answer: (a) Kaziranga
Explanation:
1. Kaziranga National Park in Assam is famous for the one-horned rhinoceros.
Teacher's Note:
1. Ranthambore is for tigers.
2. Kaziranga protects rhinos.
(a) tropical rain forests
(b) tropical rain forests and crop plants
(c) crop plants
(d) oceans
Show Answer & Explanation
Answer: (d) oceans
Explanation:
1. Oceans cover most of the earth and their phytoplankton fix the largest share of carbon by photosynthesis.
Teacher's Note:
1. Forests fix less in total.
2. Oceans fix most carbon.
(a) quick nutrient cycling
(b) soil erosion
(c) alteration of local weather conditions
(d) destruction of natural habitat of wild animals
Show Answer & Explanation
Answer: (a) quick nutrient cycling
Explanation:
1. Deforestation slows nutrient cycling, so quick nutrient cycling is not a result of it.
Teacher's Note:
1. It does cause erosion and habitat loss.
2. Nutrient cycling is not quickened.
(a) lakes and streams
(b) underground
(c) polar ice and glaciers
(d) rivers
Show Answer & Explanation
Answer: (c) polar ice and glaciers
Explanation:
1. Most of the earth's fresh water is locked in polar ice and glaciers.
Teacher's Note:
1. Rivers and lakes hold a very small share.
2. Fresh water is mostly ice.
(a) Maharashtra
(b) Rajasthan
(c) Gujarat
(d) UP
Show Answer & Explanation
Answer: (b) Rajasthan
Explanation:
1. Ranthambore National Park lies in Rajasthan.
Teacher's Note:
1. It is known for tigers.
2. Ranthambore is in Rajasthan.
(a) there is lack of proper care
(b) mass scale hunting for foreign trade
(c) its natural habitat is destroyed
(d) natural calamity
Show Answer & Explanation
Answer: (c) its natural habitat is destroyed
Explanation:
1. Habitat destruction is the greatest cause of loss of wildlife because species lose food and shelter.
Teacher's Note:
1. Hunting is the second major cause.
2. Habitat loss is the main cause.
(a) Snow leopard
(b) Hippopotamus
(c) Wolf
(d) Cheetah
Show Answer & Explanation
Answer: (d) Cheetah
Explanation:
1. The cheetah became extinct in India in the 1950s. Snow leopard and wolf still occur and the hippopotamus never lived here.
Teacher's Note:
1. Cheetahs were reintroduced later from Africa.
2. Cheetah was lost from India.
(a) Jammu and Kashmir
(b) Rajasthan
(c) Kerala and Assam
(d) The forests do not occur in India
Show Answer & Explanation
Answer: (c) Kerala and Assam
Explanation:
1. Tropical forests occur in the warm, wet regions of India such as Kerala and Assam.
Teacher's Note:
1. Rajasthan is largely arid.
2. Kerala and Assam have tropical forests.
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FAQs
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