Our Enviournment

Gaseous pollutants like carbon monoxide are controlled by ____ method.

Correct! Wrong!

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When dry air containing toxic carbon monoxide is passes through charcoal (adsorbent), carbon monoxide is trapped on the porous surface and it makes the air clean. This process is called adsorption.

Temperature of an ecosystem is often determined by ____ .

Correct! Wrong!

The solar energy available determines the temperature of an ecosystem.

Which of the following is the correct sequence in ecological terms for the below given food chain? Grass→ Grasshopper→ Frog→ Snake.

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Each level of the food chain forms a trophic level. Accordingly the levels in a food chain are producers, primary consumers, secondary consumers and tertiary consumers.

Deposits of copper are found in ____.

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Rich deposits of copper are found near Udaipur of Rajasthan.

The disease Minamata is caused by____.

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It was caused by the release of methyl mercury in the industrial waste water in Japan. This highly toxic chemical accumulated in shellfish and fish. The people consumed these fishes are reported with minamata disease.

Volcanic eruptions are a small contributor to ozone damage.

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Volcanic eruptions are a small contributor to ozone damage, accounting for one to five percent. Chlorine directly released into the stratosphere, along with sulphur dioxide.

Star tortoises are found in ____ sanctuary.

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Wild ass, Flamingo, Star tortoise and Desert fox are some of the very common animals seen in Rann of kutch of Gujarat state.

Which of the following is not concerned with soil conservation?

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Proper utilization of fertilizers increases the fertility of soil. There is no role for fertilizers in conservation of soil.

In a grazing food chain, second tropic level is occupied by ____.

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Butterfly is at the second trophic level in a grazing food chain. A herbivore that feeds on plants and occupies the second trophic level and is a primary consumer.

Excessive growth of phytoplankton in pond water is due to ____.

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The sewage wastes and nitrates from fertilizers run down into water bodies. It leads to thick growth of phytoplankton, results in the depletion of oxygen dissolved in water. It is due to nutrient enrichment is called Eutrophication.

Organisms at various ____forms a food chain.

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Food chain is formed by series of organisms feeding on one another. Each food chain has 3 to 5 trophic levels.

The process of reducing volume of wastes by burning them at high temperature is called electrostatic precipitation.

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Incineration is a process in which the wastes are burnt at high temperature and destroy to ash (temperature above 1000°C).

3rd December is observed as the World Environment Day.

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5th June is World Environment Day and 3rd December is World Conservation Day.

A green plant fixes 3000 kcal of energy. The amount of energy fixed at the 3rd tropic level is ____ kcal.

Correct! Wrong!

When green plants are eaten by primary consumers, a great deal of energy is lost as heat to the environment, some amount goes towards growth and reproduction. An average of 10% of the food eaten is turned into its own body and made available for the next level of consumers. Therefore, 10 % of 3000 Kcal is 300 kcal and 10% of 300 Kcal is 30 kcal.

The number of trophic levels in food chain depends upon ____.

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Biomass in any food chain determine the number of organism in a food chain. Greater the biomass, larger the number of individuals in any food chain.

Metals have not got any substitute.

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Because metals have unique property. The demand of certain metals can meet by mining from the ocean beds. Ex: Mn, Mg, Zn, Cu, Co, Ni, Sb, Al.

Flow of energy in ecosystem is always cyclic.

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Energy flow is always unidirectional. Energy from producer flows to the successive trophic level and each transfer is accompanied by a loss of energy. Hence, backward flow of energy is not possible.

Terrestrial organisms get affected by oil slick.

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Oil slick floats on ocean and seas, covering them in a thick film of crude of refined petroleum. They cause damage to sea weed, algae, sea mammals, shell fish and dolphins. It happens during the damage of cargoes.

Suspended particulate matter is formed from ____.

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Soot refers to carbon particles resulting from the incomplete combustion of hydrocarbons. They are microscopic, suspended particles of pollutants known as aerosols, which settle on ground hours later

Micro-organism like ____ are decomposers.

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Bacteria and fungi break down biodegradable materials, hence they are known as decomposers.

In electrostatic precipitators, precipitation is due to ____.

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Electric discharging of particles and collecting surface, bears an opposite charge to attract them.

Air pollution is mainly dominated by ____.

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Carbon monoxide is highly poisonous gas, released by incomplete combustion of fuel such as natural gas, coal or wood. Vehicular exhaust is a major source of carbon monoxide.

Green plants are called producers, because ____.

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Green plants are called producers as they conduct photosynthesis and provide food for other trophic levels.

Natural gas is a mixture of ____.

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Natural gas mainly consists of methane and some amount of ethane and propane.

Occupational disease is ____.

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Byssinosis is an occupational disease.

The relationship between biotic community and abiotic environment is ____.

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The inter-relationship between all living organisms and the abiotic environment is ecosystem.

Primary source of energy in an ecosystem is ____.

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Solar energy is the primary source of energy in any ecosystem. This is consumed by the producers to prepare their own food.

UASB is a ____.

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It is a reactor used in treatment of waste water. It removes foul odour and gives out methane. (UASB-Up flow anaerobic sludge blanket).

People working in glass making industries are suffering with ____ disease.

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Silicosis is caused due to inhalation of silica, while working in the mines, pottery glass, ceramic and construction works. Symptoms are chronic cough and pain in the chest.

Life span of chlorofluorocarbons is ____.

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20-100 years is the life span of CFCs.

CBSE Class 10th Science 15 - Our environment MCQs
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