What changes would you suggest in your home in order to be environment-friendly?
Environment- friendly consciousness is not only about the plastic bags, we have to be more conscious about the pollution control, wildlife protection and conservation, conservation of natural resources and some other actions which helps in reducing the stress conditions of the environment and all this depends on our everyday choices we make. Some changes that can be done in our homes to be environment- friendly:-
1. By saving electricity:- we should switch off our lights, fans television and energy or light appliances when they are not in use.
2. By using solar panels:- Solar panel is designed to absorb the sun’s rays as the source of the energy for generating electricity. We should use solar panels instead of generators or invertors. Almost 28- 35 solar panels are used to power a house but it also depends on the roof size, location or the number of appliances being charged by the solar panels.
3. Separation of biodegradable and non- biodegradable waste:- we should separate the biodegradable or non-biodegradable waste. Biodegradable means which can be decomposed easily like dry waste (peels of vegetables that can be used for making the fertilizer for improving the soil fertility). And, non- biodegradable is which can’t be decomposed easily like polythene, electronic waste which affects the environment.
4. By saving water:- Tap should be off while we are brushing our teeth or shaving, we should not waste the water of aquaguard as the water we consume from aqua guard, it releases the maximum amount of water than the water we are using. Approximately RO purifiers waste approx. 3 litres of water for every 1 litre of purified water. So, we should use this waste water for the plantation, for animals, for birds etc. or we can also use this waste water in mopping the floor.
5. By using these five phenomena reuse, reduce, repurpose, refuse or recycle in the kitchen appliances or in home.
Find out about the traditional systems of water harvesting/management in your region.
Suggest some approaches towards the conservation of forests.
We saw in this chapter that there are four main stakeholders when it comes to forests and wildlife. Which among these should have the authority to decide the management of forest produce? Why do you think so?
List five things you have done over the last one week to —
(a) conserve our natural resources.
(b) increase the pressure on our natural resources.
Find out the source of water in your region/locality. Is water from this source available to all people living in that area?
How can you as an individual contribute or make a difference to the management of (a) forests and wildlife, (b) water resources and (c) coal and petroleum?
Why should we conserve forests and wildlife?
Compare the above system with the probable systems in hilly/mountainous areas or plains or plateau regions.
What changes can you make in your habits to become more environment-friendly?
What can you as an individual do to reduce your consumption of the various natural resources?
Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
What is a good source of energy?
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
What is the difference between a reflex action and walking?
What is the importance of DNA copying in reproduction?
If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
Why should a magnesium ribbon be cleared before burning in air?
Define the principal focus of a concave mirror.
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?
A solar water heater cannot be used to get hot water on
(a) a sunny day. (b) a cloudy day.
(c) a hot day. (d) a windy day.
The magnification produced by a plane mirror is +1. What does this mean?
On what basis would you classify energy sources as
(a) renewable and non-renewable?
(b) exhaustible and inexhaustible?
Are the options given in (a) and (b) the same?
Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?
The essential difference between an AC generator and a DC generator is that
(a) AC generator has an electromagnet while a DC generator has permanent magnet.
(b) DC generator will generate a higher voltage.
(c) AC generator will generate a higher voltage.
(d) AC generator has slip rings while the DC generator has a commutator.
Name some sources of direct current.
Explain the following.
(a) Why is the tungsten used almost exclusively for filament of electric lamps?
(b) Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?
(c) Why is the series arrangement not used for domestic circuits?
(d) How does the resistance of a wire vary with its area of cross-section?
(e) Why are copper and aluminium wires usually employed for electricity transmission?
Explain the terms analogous and homologous organs with examples.
A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located?
An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed.