25 Questions MCQ Test Science Class 10 - Our Environment - 3
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Detailed Solution for Our Environment - 3 - Question 1
Environment refers to those surroundings that surrounds living beings from all sides and affect their lives in toto. It consists of atmosphere, hydrosphere, lithosphere and biosphere. It's chief components are soil, water, air, organisms and solar energy.
Detailed Solution for Our Environment - 3 - Question 2
The ozone layeror ozone shield is a region of earth's stratosphere that absorbs most of the sun's ultraviolet radiation. It contains high concentration of ozone in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere. As the Ozonosphere only contains high levels of ozone gas, therefore all the other things such as the dust particles, water vapour and CO2 are absent from it.
How many ozone molecules can be destroyed by one chlorine fragment before other chemical processes remove the chlorine from the atmosphere :-
Detailed Solution for Our Environment - 3 - Question 3
When ultraviolet light waves (UV) strike CFC* (CFCl3) molecules in the upper atmosphere, a carbon-chlorine bond breaks, producing a chlorine (Cl) atom. The chlorine atom then reacts with an ozone (O3) molecule breaking it apart and so destroying the ozone. This forms an ordinary oxygen molecule(O2) and a chlorine monoxide (ClO) molecule. Then a free oxygen** atom breaks up the chlorine monoxide. The chlorine is free to repeat the process of destroying more ozone molecules. A single CFC molecule can destroy 100,000 ozone molecules.
Detailed Solution for Our Environment - 3 - Question 4
Ozone is a molecule made up of three oxygen atoms, often referenced as O3. Ozone is formed when heat and sunlight cause chemical reactions between oxides of nitrogen and volatile organic compounds, which are also known as hydrocarbons.
Detailed Solution for Our Environment - 3 - Question 8
An ecosystem includes all of the living things (plants, animals, and organisms) in a given area that interact with each other, as well as the non-living environments (weather, earth, sun, soil, climate, atmosphere) that surround the living things.
Detailed Solution for Our Environment - 3 - Question 11
All food chains start with energy from the sun. This energy is captured by plants. Thus the living part of a food chain always starts with plant life and ends with an animal. Plants are called producers because they are able to use light energy from the sun to produce food (sugar) from carbon dioxide and water.
The total energy fixed by a gram plant (Cicer arietinum) in an ecosystem on the whole is called
Detailed Solution for Our Environment - 3 - Question 12
Gross primary productivity is the total organic matter synthesized by the producers in the process of photosynthesis. Hence, total energy fixed by a gram plant in an ecosystem will be called as gross production.
Detailed Solution for Our Environment - 3 - Question 13
Grazing food chain is a food chain in which the energy in the lowest trophic level is derived from photosynthesis. Hence, it directly depends on solar radiation. Plants are the producers which capture solar energy to synthesize food.
Detailed Solution for Our Environment - 3 - Question 14
The Sun is the major source of energy for organisms and the ecosystems of which they are a part. Producers, such as plants and algae, use energy from sunlight to make food energy by combining carbon dioxide and water to form organic matter.
Detailed Solution for Our Environment - 3 - Question 15
A food web (or food cycle) is the natural interconnection of food chains and a graphical representation (usually an image) of what-eats-what in an ecological community. Another name for food web is consumer-resource system.
Detailed Solution for Our Environment - 3 - Question 17
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. During the transfer of energy through successive trophic levels in an ecosystem, there is a loss of energy all along the path.
Detailed Solution for Our Environment - 3 - Question 21
Food chain is the flow of energy in a sequential process of one organism eating the other and itself being eaten by another in turn. Thus, it is a series of organisms taking part at various biotic levels from the producer and ends in consumer.
Example- Producer → Primary Consumer → Secondary Consumer → Tertiary Consumer
Examples of food chains:
(i) Food chain in forest or grassland ecosystems:-
Grass → Grasshopper → Frog → Snake → Eagle
(Producer) → (Herbivore) → (Carnivore) → (Carnivore) → (Top Carnivore)
Detailed Solution for Our Environment - 3 - Question 22
Phytoplankton form the basis of life in the ocean. Some of this food passes directly along the food chain when zooplankton eat the phytoplankton and in turn are consumed by larger animals such as fish, whales, squid, shellfish and birds.
Detailed Solution for Our Environment - 3 - Question 23
The correct answer is D as Food chains start with primary producers and end with decomposers. Food chains start at trophic level 1 with primary producers such as plants, move to herbivores at level 2, predators at level 3 and finish with carnivores or apex predators at level 4 or 5. Decomposers mark the end of a food chain. Decomposers recycle nutrients, so they can be reused by primary producers.
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