Chromosomes are thread-like structures, made of proteins and DNA, found in the nucleus at the time of cell division.Each chromosome of a... View Article
These organs which have the same structure and embryonic origin but perform the different functions. Example of homologous organs are the... View Article
The ozone layer is continuously formed in the atmosphere because of the action of UV rays on molecular oxygen. The high-energy UV radiations... View Article
2000J → 200J → 20j (According to 10% law) The flow of energy from one trophic level to another trophic level in the food chain is explained in... View Article
(a) Trophic Levels The various steps in a food chain at which the transfer of food takes place are called trophic levels.The trophic level is... View Article
(a) The most electropositive element is 19A39(Potassium). (b) A noble gas is 18D40Â (Argon). (c) A metalloid is 14B28Â (Silicon). (d) An element... View Article
Amongst dry HCl gas and HCl solution, HCl solution will show acidic properties. This is because dry gas does not show any effect on the pH paper... View Article
The colour of the litmus paper is changed by the hydrogen ions. Dry HCl gas does not contain H+ ions. It is only in the aqueous solution that an... View Article
(i) Only one-half of the water molecule is shown in the formula of Plaster of Paris because 2 formula units of CaSO4 (Calcium sulphate) share 1... View Article
(i) A is Calcium Oxide (CaO) and B is calcium hydroxide Ca(OH)2. (ii) The reaction is shown below: The formula for lime water is Ca(OH)2Â and the... View Article
(a) Both (A) and (R) are true and (R) is correct explanation of the assertion. Ethanoic acid is also known as glacial acetic acid. The melting... View Article
(b) X2Y The formula of the compound formed by an element X (atomic number 11) and an element Y (atomic number 8) is X2Y. The formula of the... View Article
(c) Group 9 period 5 On the basis of the electronic configuration of 5X9, the group number of the element ‘X’ is 9 and period 5.The periodic... View Article
b) Clove oil Olfactory indicators may be used as the presence of acid can be detected through smell. Hence, it can be used by a visually... View Article
 (d) x = physical state of KClO3 and KCl; y = reaction condition; z = physical state of O2. Explanation:  2KClO3(x) → (y)2KCl(x) +... View Article
b) Maharashtra Bandharas and Tals are ancient old water harvesting concepts found in Maharashtra. Kattas was the temporary check dams that were... View Article
c) Carbon monoxide Incomplete combustion of coal produces carbon monoxide which is a poisonous gas. Complete combustion of coal gives carbon... View Article
(c) Sugarcane and rice Sugarcane is an exceptionally water-intensive crop, needing between 1,500 and 3,000 litres of water per kilogram of... View Article