State the two forms of energy in which energy is mainly utilised at our homes.
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Fill in the blanks: (a) Burning of wood and coal causes _________of air. (b) A liquid fuel used in homes is ___________.
(a) Burning of wood and coal causes pollution of air. (b) A liquid fuel used in homes is LPG. (c) Fuel must be heated to its ignition temperature before it starts burning. (d)...
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Define transgenic animals. Explain in detail any four areas where they can be utilised.
Transgenic animals are products of genetic engineering and express specificgene(s) from totally unrelated source. Following are the four main areas where they can be utilised 1. To study normal physiology and development these...
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Explain why carbon forms compounds mainly by covalent bond. Explain in brief two main reasons for carbon forming a large number of compounds.
Carbon has 4 electrons in its outermost shell, and needs to gain or lose 4 electrons to attain noble gas configuration. Losing or gaining 4 electrons is not possible due...
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which property of concave mirror is utilised for using them as shaving mirrors?
When an object is placed between the pole and focus of concave mirror a magnified, erect and virtual image is obtained.
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We often observe domestic waste decomposing in the bylanes of our homes.
Residents can be made aware by spreading awareness by different ways: (i) Organising street plays, (ii) distributing pamphlets to the residents, (iii) reuse/recycle of the waste products, (iv) calling meeting of residents, welfare society/association...
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Name the following: (a) The nutrients which mainly give energy to our body.
(a) The nutrients which mainly give energy to our body – Carbohydrates and Fats (b) The nutrients that are needed for the growth and maintenance of our body - Proteins (c) A...
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Both nucellus and endosperm have abundant reserve food materials. How is their food reservoir utilised in angiosperms ?
The reserve food material is utilised for the development of the embryo in angiosperms
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Define receptor and state their location in our body. Mention any two receptors present in our forebrain and their functions.
(i) Specialised tips of some nerve cells which receive information from the surroundings. Location: Sense organs Gustatory receptor: detect a taste Olfactory receptor: detect a smell (ii) The information acquired at the end of...
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Which one of the following statements is not true? (a) Ghaggar's water is utilised in the Indira Gandhi canal
(a) Indira Gandhi Canal originated from Harike barrage at Sultanpur on Sutlej but Ghaggar is a tributary of river Saraswati, which ends in the Thar desert.
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What are resources which are found in a region but have not been utilised called?
Potential resources
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