Class 12 Biology - Chapter Ecosystem NCERT Solutions | Give two examples of artificial or man m
Give two examples of artificial or man made ecosystems. List the salient features by which they differ from natural ecosystems.
An ecosystem is a functional unit consists of all the organisms in the particular place that interacts with one another or with their physical environment that are interconnected by the flow of energy and a cycling of materials. It consists of various biotic and abiotic components. There are two different types of ecosystem: Natural ecosystem and Artificial or domesticated ecosystem.
Artificial or domesticated ecosystem is maintained artificially by the man by the addition of energy. For example: crop lands or crop fields like maize, wheat, rice field etc. where the man tries to control the biotic community as well as the physio- chemical environment.
Difference between natural and man- made or artificial ecosystem are as follows:
Natural ecosystem occurs naturally and includes two types of ecosystem: Terrestrial and Aquatic ecosystem whereas artificial or domesticated ecosystem is maintained artificially by the man by the addition of energy. In the Natural ecosystem, biotic and abiotic components are self- sustained; on the other hand, in artificial ecosystem the components are sustained artificially by regular feeding and cleaning of aquarium etc.
More Questions From Class 12 Biology - Chapter Ecosystem
- Q:- Give an account of energy flow in an ecosystem.
- Q:- Fill in the blanks.
(a) Plants are called as_________ because they fix carbon dioxide.
(b) In an ecosystem dominated by trees, the pyramid (of numbers) is _________ type.
(c) In aquatic ecosystems, the limiting factor for the productivity is _________.
(d) Common detritivores in our ecosystem are_________.
(e) The major reservoir of carbon on earth is_________. - Q:- Which one of the following has the largest population in a food chain?
(a) Producers
(b) Primary consumers
(c) Secondary consumers
(d) Decomposers - Q:- Distinguish between
(a) Grazing food chain and detritus food chain
(b) Production and decomposition
(c) Upright and inverted pyramid
(d) Food chain and Food web
(e) Litter and detritus
(f) Primary and secondary productivity - Q:- What is the percentage of photosynthetically active radiation (PAR), in the incident solar radiation.
(a) 100%
(b) 50 %
(c) 1-5%
(d) 2-10% - Q:- Define decomposition and describe the processes and products of decomposition.
- Q:-
Secondary producers are
(a) Herbivores
(b) Producers
(c) Carnivores
(d) None of the above - Q:- Describe the components of an ecosystem.
- Q:- Define ecological pyramids and describe with examples, pyramids of number and biomass.
- Q:- The second trophic level in a lake is-
(a) Phytoplankton
(b) Zooplankton
(c) Benthos
(d) Fishes
Popular Questions of Class 12 Biology
- Q:- Why is reproduction essential for organisms? Answer
- Q:- Name the parts of an angiosperm flower in which development of male and female gametophyte take place.
- Q:-
Fill in the blanks:
(a) Humans reproduce __________. (asexually/sexually)
(b) Humans are__________. (oviparous/viviparous/ovoviviparous)
(c) Fertilization is __________ in humans. (external/internal)
(d) Male and female gametes are __________. (diploid/haploid)
(e) Zygote is __________. (diploid/haploid)
(f) The process of release of the ovum from a mature follicle is called__________.
(g) Ovulation is induced by a hormone called the __________.
(h) The fusion of male and female gametes is called _____________.
(i) Fertilisation takes place in _____________.
(j) Zygote divides to form _____________which is implanted in uterus.
(k) The structure which provides vascular connection between fetus and uterus is called ____________. - Q:- What do you think is the significance of reproductive health in a society?
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Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine. - Q:- Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory.
- Q:- What are the various public health measures, which you would suggest as safeguard against infectious diseases?
- Q:- Explain in brief the role of animal husbandry in human welfare.
- Q:- Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why?
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