Science
(i) Why does a kitchen garden called an artificial ecosystem while a forest is considered to be a natural ecosystem ?
(ii) While designing an artificial ecosystem at home, write any two things to be kept in mind to convert it into a self-sustaining system. Give reason to justify your answer.
Answer
(i) Kitchen garden is known as artificial ecosystem because the biotic and abiotic factors are modified by humans and not decided by the nature as in natural ecosystems like forest. In forests, humans do not modify biotic or abiotic factors.
(ii) Two things to be kept in mind to convert an artificial ecosystem into a self-sustaining system are:
- Balance between producers and consumers — We should select inter-dependable producers and consumer to make the ecosystem self sustainable. They should form food web so that their population is controlled.
- Waste management — The involvement of decomposers is very important for sustainable ecosystem.
Natural ecosystems are self sustaining due to a perfect relation of interdependence. For converting an artificial ecosystem into a self-sustaining system we should try to minimize human interference and include organisms that make it sustainable.
Related Questions
(i) Draw the pattern of magnetic field lines of
(1) a current carrying solenoid
(2) a bar magnet
(ii) List two distinguishing features between the two fields.
(i) Construct a food chain of four trophic levels comprising the following :
Hawk, snake, plants, rat.
(ii) 20,000 J of energy was transferred by the producers to the organism of second trophic level. Calculate the amount of energy that will be transferred by organisms of the third trophic level to the organisms of the fourth trophic level.
Give reasons for the following :
(a) Danger signals installed at airports and at the top of tall buildings are of red colour.
(b) The sky appears dark to the passengers flying at very high altitudes.
(c) The path of a beam of light passing through a colloidal solution is visible.
(i) State the rule used to find the force acting on a current carrying conductor placed in a magnetic field.
(ii) Given below are three diagrams showing entry of an electron in a magnetic field. Identify the case in which the force will be
(1) maximum
(2) minimum respectively.
Give reason for your answer.
