o level economics

1) They produce food for all organisms 2) They provide beneficial substances like drugs, tannins, fibres, rubber, vegetable oils, fuel, condiments. 3) Some plants contain alkaloids which check growth of cancer cells. Example: Rosy periwinkle. 4) Plants release O 2 , cool environment by r..

. Extra water generated by these sources was thought to be the reason for rise in sea level. Recently, another groups of scientists headed by Dr. Duncan Wingham have enunciated a theory that rise in sea level is due to expansion of sea water. Although it may look impracticable i..

A balloon at a height of 38 meters from the ground level is attached to a string inclined at 33 o to the horizontal. Find the length of the string to the nearest meter. => 90 meters or 130 meters or 45 meters or 69 meters..

Classify the data according to the level of measurement. [nominal - N, ordinal - O, interval - I, ratio - R] 1. temperature 2. wages 3. time 4. zip code 5. grade => 1 - I, 2 - R, 3 - R, 4 - N, 5 - O or 1 - O, 2 - N, 3 - I, 4 - R, 5 - I or 1 - N, 2 - R, 3 - I,..

Oxygen Molecule (O 2 ) - Therefore, oxygen molecule has 16 electrons. In the formation of molecular orbitals, the electrons in the inner shells are expressed as KK denoting ( s 1s) 2 ( s *1s) 2 .The remaining 12 electrons are filled in molecular orbitals. fig 1.20 - Molecular orbital ener..

Pizza huts in a town are classified according to the following. 1. locality of the shop 2. sales turnover 3. taste of the pizza 4. price of the pizza Identify the level of measurement of classification as nominal (N), ordinal (O), interval (I) and ratio (R). => 1 - I, 2 - N, 3 -..

Heat and Temperature - Heat energy is present in every object above absolute zero. How do we know that heat is present in every object? Temperature of the body is an indication. (Absolute zero is the lowest temperature possible and is equal to -273 o C). Are heat and temperature one and t..

A report by scientists at the United Nations Environment Program (UNEP) said the Asian Brown haze is a three kilometer deep blanket of pollution in the sky, which stretches across South Asia, and has been caused by the spectacular economic development experienced by this part of the worl..

Electrons revolve around the nucleus in different energy levels or shells and each shell is associated with definite energy. The energy of the K shell is the least while those of L, M, N and O shells increases progressively. We also know that any system that has least energy is..

Arrangement of Electrons in an Atom (Bohr-Bury Scheme) - Electrons revolve around the nucleus in different energy levels or shells and each shell is associated with definite energy. The energy of the K shell is the least while those of L, M, N and O shells increases progressivel..