(a) Heterotrophic bacteria (a) They act as decomposers and help in the formation of humus. (b) They help in the production of curd from milk. (c) Many antibiotics are obtained from some species of bacteria. (d) Many soil bacteria help in fixation of atmospheric nitrogen. (b) Archaebacteria (a) MethaRead more
(a) Heterotrophic bacteria
(a) They act as decomposers and help in the formation of humus.
(b) They help in the production of curd from milk.
(c) Many antibiotics are obtained from some species of bacteria.
(d) Many soil bacteria help in fixation of atmospheric nitrogen.
(b) Archaebacteria
(a) Methane gas is produced from the dung of ruminants by the methanogens.
(b) Methanogens are also involved in the formation of biogas and sewage treatment.
The classification systems have undergone several changes with time. The first attempt of classification was made by Aristotle. He classified plants as herbs, shrubs, and trees. Animals, on the other hand, were classified on the basis of presence or absence of red blood cells. This system of classifRead more
The classification systems have undergone several changes with time. The first attempt of classification was made by Aristotle. He classified plants as herbs, shrubs, and trees. Animals, on the other hand, were classified on the basis of presence or absence of red blood cells. This system of classification failed to classify all the known organisms.
Therefore, Linnaeus gave a two kingdom system of classification. It consists of kingdom Plantae and kingdom Animalia. However, this system did not differentiate between unicellular and multicellular organisms and between eukaryotes and prokaryotes. Therefore, there were large numbers of organisms that could not be classified under the two kingdoms.
To solve these problems, a five kingdom system of classification was proposed by R.H Whittaker in 1969. On the basis of characteristics, such as cell structure, mode of nutrition, presence of cell wall, etc., five kingdoms, Monera, Protista, Fungi, Plantae, and Animalia were formed.
State two economically important uses of: (a) Heterotrophic bacteria (b) Archaebacteria
(a) Heterotrophic bacteria (a) They act as decomposers and help in the formation of humus. (b) They help in the production of curd from milk. (c) Many antibiotics are obtained from some species of bacteria. (d) Many soil bacteria help in fixation of atmospheric nitrogen. (b) Archaebacteria (a) MethaRead more
(a) Heterotrophic bacteria
(a) They act as decomposers and help in the formation of humus.
(b) They help in the production of curd from milk.
(c) Many antibiotics are obtained from some species of bacteria.
(d) Many soil bacteria help in fixation of atmospheric nitrogen.
(b) Archaebacteria
(a) Methane gas is produced from the dung of ruminants by the methanogens.
(b) Methanogens are also involved in the formation of biogas and sewage treatment.
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Discuss how classification systems have undergone several changes over a period of time?
The classification systems have undergone several changes with time. The first attempt of classification was made by Aristotle. He classified plants as herbs, shrubs, and trees. Animals, on the other hand, were classified on the basis of presence or absence of red blood cells. This system of classifRead more
The classification systems have undergone several changes with time. The first attempt of classification was made by Aristotle. He classified plants as herbs, shrubs, and trees. Animals, on the other hand, were classified on the basis of presence or absence of red blood cells. This system of classification failed to classify all the known organisms.
Therefore, Linnaeus gave a two kingdom system of classification. It consists of kingdom Plantae and kingdom Animalia. However, this system did not differentiate between unicellular and multicellular organisms and between eukaryotes and prokaryotes. Therefore, there were large numbers of organisms that could not be classified under the two kingdoms.
To solve these problems, a five kingdom system of classification was proposed by R.H Whittaker in 1969. On the basis of characteristics, such as cell structure, mode of nutrition, presence of cell wall, etc., five kingdoms, Monera, Protista, Fungi, Plantae, and Animalia were formed.
For more answers visit to website:
https://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-2/
See less