(i) An unripe fruit is green because it contains chloroplasts in its skin. Towards ripening of the friut, the chloroplasts are changed into chromoplasts which give the fruit an attractive non-green colour such as yollow, orange, reddish, pink, purple, brownish, etc.
(ii) The colour of pire fruits attracts animals. The coloured fruits are often sweet and fleshy. Animals such as birds, monkeys, come to feed over the fruits.
(iii) While eating the flesh of fruits, the animals pick up to seeds and take them to different places visited by them. This helps in the dispersal of seeds. Therefore by this action both the animals and the plants are benefitted. It is mutualism.
(iv) Mutualism or mutual dependence is the law of human society. No body can live and work alone. Every body is dependent on somebody else for most of his/her activities. For example, household workers such as cook, utensil cleaner, washerman, gardner, driver, scavenger, hair dresser, tailor, etc., work for you for which you pay so that the worker is able to run his/her family.
