NATURAL INDICATORS

Fill in the cross word given as Figure 5.2 with the help of the clues provided . ACROSS (2) The solution which does not change the colour of either red or blue litmus . (4) Phenolphthalein gives pink colour in this type of solution . (7) Colour of blue litmus in lemon juice . DOWN (1) It is used to test whether a substance is acidic or basic . (3) It is a natural indicator and gives pink colour in basic solution . (5) Nature of ant's sting . (6) It is responsible for increase in temperature during a neutralisation reaction.

Acids And Bases|Indicators For Testing Acids And Bases|Litmus Indicator|Phenolphthalein Indicators|Methyl Orange Indicators|Examples|Olfactory Indicators|Turmeric As Indicators|Questions

Quick Revision|What Is An Indicator?|Types Of Indicator|OMR|Onion|OMR

Natural system of classification is I. based on one or few characters which are not related to phylogenetic significance. II. based on overall characters which indicated natural relationships. III. Based on evolutionary and genetic relationships of organisms. IV. given by AL de Jussieu.

The above figures are taken from the website of National Stock Exchange of India. They illustrate the movement of NSE stock indices as well as world stock indices on the date indicated. What factors affect the movement of stock indices? Elaborate on the nature of these factors.

[A] : Biological indicators enhance usefulness of ecology to mankind . [R] : Their knowledge is useful in protection and reclamation along coasts , water purification nature conservation etc .