Can you suggest some changes in your school which would make it environment-friendly?
Some changes we can make in our school which would make it environmental- friendly. These are following:-
1. Plantation of the trees around the school campus, make loan to sit in the ground that will be more comfortable for the kids as well as the teachers.
2. We should switch off our lights, fans television and energy or light appliances when they are not in use.
3. Putting solar panels on the roof of the school instead of using generator because solar panel generators are silent and have no moving parts. Generators produce high amount of noise that comes from gas or diesel powered machines. Solar panels require less maintenance than generators.
4. By avoiding water waster while we are drinking.
5. By separating degradable or non- biodegradable wastes.
6. There can be more windows for saving the electricity bill or for the natural light consumption.
7. Reusing the paper for writing on both the sides or we can use pencil for the rough work so that we can use the paper for the multiple times.
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.
Why do you think that there should be equitable distribution of resources? What forces would be working against an equitable distribution of our resources?
What changes can you make in your habits to become more environment-friendly?
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?
What are the components of the transport system in human beings? What are the functions of these components?
Describe the structure and functioning of nephrons.
Name the sodium compound which is used for softening hard water.
How is a voltmeter connected in the circuit to measure the potential difference between two points?
How does chemical coordination take place in animals?
(i) Write the electron-dot structures for sodium, oxygen and magnesium.
(ii) Show the formation of Na2O and MgO by the transfer of electrons.
(iii) What are the ions present in these compounds?
What is the importance of DNA copying in reproduction?
What would be the consequences of a deficiency of haemoglobin in our bodies?
Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?
The brain is responsible for
(a) thinking.
(b) regulating the heart beat.
(c) balancing the body.
(d) all of the above.