61. Manmade resources are alternative to natural resources for a variety of reasons. Which of these would not be one of those?
They increase variety and choice
They are cheaper to produce than natural resources
They are made from renewable resources
They are better suited for the purpose for which they will be used
Answer.3. They are made from renewable resources
Explanation:
When humans use natural things to make something new that provides utility and value to our lives, it is called Man-made resources.
Man-made resources are mostly renewable. One can re-build a building or fixed a broken machine.
62. Which of these is not a fossil fuel?
Coal
Oil
Natural gas
Uranium
Answer.4. Uranium
Explanation:
Fossil fuels are combustible hydrocarbons formed millions of years ago from the dead decaying plants and animals buried under sediment.
Coal, crude oil, and natural gas are all considered fossil fuels because they were formed from fossilized.
Unlike coal or crude oil, Uranium does not remain of a prehistoric organism, and therefore it is not a fossil fuel – it’s just fuel.
63. A liquid fuel that was formed from the ancient remains of sea plants and animals is
Natural gas
Petroleum
Geothermal energy
Coal
Answer.2. Petroleum
Explanation:
A liquid fuel that was formed from the ancient remains of sea plants and animals is Petroleum.
Petroleum is a complex mixture of hydrocarbons that occur on Earth in liquid, gaseous, or solid form. The term is often restricted to the liquid form, commonly called crude oil.
Like coal and natural gas, petroleum was formed from the remains of ancient marine organisms, such as plants, algae, and bacteria.
64. Energy in the rays from the sun is called
Solar energy
Wind energy
Tidal energy
Water energy
Answer.1.
Explanation:
Energy in the rays from the sun is called solar energy. Solar energy is simply the light and heat that come from the sun. It is harnessed using a range of technologies such as solar power to generate electricity, solar thermal energy including solar water heating, and solar architecture.
65. Which is a list of renewable resources?
Petroleum, geothermal, wind
Biomass, geothermal, hydropower
Natural gas, wind, biomass
Hydropower, solar, wind energy
Answer.4. Hydropower, solar, wind energy
Explanation:
Renewable resources include biomass energy (such as ethanol), hydropower, geothermal power, wind energy, and solar energy. Biomass refers to organic material from plants or animals. This includes wood, sewage, and ethanol (which comes from corn or other plants).
66. Energy from the heat inside the earth is
Natural gas
Geothermal
Petroleum
Terrathermal
Answer.2. Geothermal
Explanation:
Geothermal energy is heat within the earth. The word geothermal comes from the Greek words geo (earth) and therme (heat). Geothermal energy is a renewable energy source because heat is continuously produced inside the earth.
67. A coal deposit that is not economical to mine today would be considered part of our ___________
Coal reserves
Coal resources
Coal reservoirs
None of these
Answer.1. Coal reserves
Explanation:
A coal deposit that is not economical to mine today would be considered part of our Coal reserves.
Coal reserves refer to large deposits of coal which, based on geological surveys and engineering studies, are thought to exist to a very high degree of certainty. In addition to the knowledge of their existence, these reserves are also accessible and coal can be produced from them economically.
68. Which out of the following are the causes of soil erosion?
Unrestricted grazing
Over cultivation
Deforestation
All of the above
Answer.4. All of the above
Explanation:
Soil erosion occurs primarily when dirt is left exposed to strong winds, hard rains, and flowing water. In some cases, human activities, especially farming and land clearing, leave soil vulnerable to erosion.
Following are the important causes of soil erosion:
Rainfall and Flooding
Over cultivation
Unrestricted grazing
Logging and Mining
Construction
Rivers and Streams
Heavy Winds
Loss of Arable Land
69. The process of restoring forests that once existed but was removed at some time in the past is known as
Afforestation
Reforestation
Deforestation
None of these
Answer.2. Reforestation
Explanation:
Reforestation is the process of planting trees in a forest where the number of trees has been decreased or removed.
Reforestation (occasionally, reafforestation) is the natural or intentional restocking of existing forests and woodlands (forestation) that have been depleted, usually through deforestation, but also after clearcutting.
70. Red data book contains data of
All plant species
All animal species
Threatened species
Economically important species
Answer.3. Threatened species
Explanation:
Red Data Book contains information on all the endangered species of flora and fauna in a country or state. It is maintained by International Union for Conservation of Nature.
71. IUCN Headquarters is at
Morges, Switzerland
Paris, France
Vienna, Austria
New York, USA
Answer.2. Paris, France
Explanation:
IUCN, International Union for Conservation of Nature, was established on 5 October 1948 in the French town of Fontainebleau. As the first global environmental union, it brought together governments and civil society organizations with a shared goal to protect nature.
72. Which of the following regions has the maximum diversity?
Mangroves
Temperate forest
Taiga
Coral reefs
Answer.4. Coral reefs
Explanation:
Coral reefs teem with diverse life. Thousands of species can be found living on one reef.
Coral reefs are believed by many to have the highest biodiversity of any ecosystem on the planet—even more than a tropical rainforest. Occupying less than one percent of the ocean floor, coral reefs are home to more than 25% of all marine life.
73. The most important reason for decrease in biodiversity is
Habitat pollution
Overexploitation
Habitat destruction
Introduction of exotic species
Answer.1. Habitat pollution
Explanation:
The most important reason for the decrease in biodiversity is Habitat destruction.
Activities such as harvesting natural resources, industrial production, and urbanization are human contributions to habitat destruction.
Pressure from agriculture is the principal human cause. Some others include mining, logging, trawling, and urban sprawl.
74. Dodo is
Endangered species
Rare species
Extinct species
Exotic species
Answer.3. Extinct species
Explanation:
A dodo was a very large bird that was unable to fly. Dodos are now extinct species.
75. Blue whale is placed under
Endangered
Rare
Extinct
Exotic
Answer.1. Endangered
Explanation:
Blue whales were significantly depleted by commercial whaling activities worldwide. Today, blue whales are listed as endangered under the Endangered Species Act and protected under the Marine Mammal Protection Act.
