Home
Class 10
BIOLOGY
What is an ecosystem ? List its two main...

What is an ecosystem ? List its two main components. We do not clean natural ponds or lakes but an aquarium needs to be cleaned regularly. Why is it so ? Explain.

Text Solution

Verified by Experts

Ecosystem is the structural and functional unit of biosphere, comprising of all the interacting organisms in an area together with the non-living constituents of the environment.
Two main components of Ecosystem are :
(i) Biotic component
(ii) Abiotic component
An aquarium is an artificial and incomplete ecosystem compared to pond or lakes which are natural, self-sustaining and complete ecosystem where there is a perfect recycling of materials.
Aquarium need to be cleaned regularly because of :
(i) absence of natural decomposer.
(ii) stagnancy of water.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • OUR ENVIRONMENT

    OSWAAL PUBLICATION|Exercise TOPIC - 1 (ECOSYSTEM AND FOOD CHAIN)(LONG ANSWER TYPE QUESTIONS)|4 Videos

  • OUR ENVIRONMENT

    OSWAAL PUBLICATION|Exercise TOPIC - 2 (BIODEGRADABLE AND NON - BIODEGRADABLE SUBSTANCES AND GLOBAL WARMING)(MULTIPLE CHOICE QUESTIONS)|2 Videos

  • OUR ENVIRONMENT

    OSWAAL PUBLICATION|Exercise TOPIC - 1 (ECOSYSTEM AND FOOD CHAIN)(SHORT ANSWER TYPE QUESTIONS - I)|15 Videos

  • LIFE PROCESSES

    OSWAAL PUBLICATION|Exercise NCERT CORNER ( TEXTBOOK EXERCISES )|13 Videos

  • QUESTION PAPER APR 2019

    OSWAAL PUBLICATION|Exercise EXERCISE|32 Videos

Similar Questions

Explore conceptually related problems

(i) We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why ? (ii) What are the harmful byproducts of fertilizers industries ? How do they affect the environment ? (iii) Why are crop fields known as artificial ecosystem ?

Why do we need to separate different components of a mixture? Give two examples.

(a) What happens if a bar magnet is cut into two pieces: (i) transverse to its length, (ii) along its length? (b) A magnetised needle in a uniform magnetic field experiences a torque but no net force. An iron nail near a bar magnet, however, experiences a force of attraction in addition to a torque. Why? (c) Must every magnetic configuration have a north pole and a south pole? What about the field due to a toroid? (d) Two identical looking iron bars A and B are given, one of which is definitely known to be magnetised. (We do not know which one.) How would one ascertain whether or not both are magnetised? If only one is magnetised, how does one ascertain which one? [Use nothing else but the bars A and B.)

Answer the following: (a) The top of the atmosphere is at about 400 kV with respect to the surface of the earth, corresponding to an electric field that decreases with altitude. Near the surface of the earth, the field is about 100 Vm^(-1) . Why then do we not get an electric shock as we step out of our house into the open? (Assume the house to be a steel cage so there is no field inside!) (b) A man fixes outside his house one evening a two metre high insulating slab carrying on its top a large aluminium sheet of area 1m^(2) . Will he get an electric shock if he touches the metal sheet next morning (c) The discharging current in the atmosphere due to the small conductivity of air is known to be 1800 A on an average over the globe. Why then does the atmosphere not discharge itself completely in due course and become electrically neutral? In other words, what keeps the atmosphere charged? (d) What are the forms of energy into which the electrical energy of the atmosphere is dissipated during a lightning? (Hint: The earth has an electric field of about 100 Vm^(-1) at its surface in the downward direction, corresponding to a surface charge density = –10^(–9) Cm^(–2) . Due to the slight conductivity of the atmosphere up to about 50 km (beyond which it is good conductor), about + 1800 C is pumped every second into the earth as a whole. The earth, however, does not get discharged since thunderstorms and lightning occurring continually all over the globe pump an equal amount of negative charge onthe earth.)

Home
Profile