What changes can you make in your habits to become more environment-friendly?
Changes to make our habitat more environmental friendly can be done in various ways:-
We must have done the five R’s to protect our environment:- reduce, refuse, recycle, repurpose and reuse.
Refuse means say no to the harmful things that can harm our environment and us like say no to single use plastic like plastic glasses- use paper glasses that is biodegradable, say no to plastic carry bags- use jute bags, do not take polythene for the small things we can carry in our jute bag etc; Reduce means that we should use less amount of things that we are using in our daily lives like we should save lights by switching off necessary lights, bulbs, fans or by not wasting food take the food in limited amount that we can eat; Reuse means we can use things again and again like jars for putting pickle again and again, glass bottles like jam bottle can be used again in the kitchen for the storage. And, this reuse phenomena does not use any energy; Repurpose is the phenomena where the thing cannot be used for the same purpose but we can use this for some purposes like plastic bottles, cracked crockery or cups these can be used for the plantation or for feeding the birds; Recycle means that use of wastes by recycling them like agricultural waste including paddy husks, corn cobs, fibrous coats of coconuts, tobacco waste and used papers can be converted into the usable papers and boards by the paper mills. Recycling of papers is very costly and needs some energy but worthwhile from the conservation of resources point of view recovery or recycling of papers can save many trees. By using these methods we can make our environment friendly and alternatively we our saving our environment from the exploitation because if the natural resources get extinct from the environment we will face the extreme conditions without the resources. If we will use environmental friendly ways we are automatically saving the basic human needs for the future generation and this concept is also known as the sustainable development. This perception for the sustainable development, changes the socio- economic services concept to meet the requirements for the future generation or to make our environment long- ranging by using limited amounts of resources.
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
Outline a project which aims to find the dominant coat colour in dogs.
Draw the structure for the following compounds.
(i) Ethanoic acid (ii) Bromopentane*
(iii) Butanone (iv) Hexanal.
*Are structural isomers possible for bromopentane?
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?
How is the sex of the child determined in human beings?
(a) What property do all elements in the same column of the Periodic Table as boron have in common?
(b) What property do all elements in the same column of the Periodic Table as fluorine have in common?
Calculate the number of electrons constituting one coulomb of charge.
What is an homologous series? Explain with an example.
Why is variation beneficial to the species but not necessarily for the individual?
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
The anther contains
(a) sepals.
(b) ovules.
(c) pistil.
(d) pollen grains.
Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.
Why are some patients of diabetes treated by giving injections of insulin?
Explain the following terms with one example each.
(a) Corrosion
(b) Rancidity
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
A shiny brown coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black coloured compound formed.
Explain the following in terms of gain or loss of oxygen with two examples each.
(a) Oxidation
(b) Reduction
Why should a magnesium ribbon be cleared before burning in air?
Name two energy sources that you would consider to be renewable. Give reasons for your choices.
What would be the consequences of a deficiency of haemoglobin in our bodies?