(a) Heterotrophic bacteria
(1) Many bacteria like Lactobacillus helps in the production of curd from milk.
(2) They act as decomposers and help in the formation of humus e.g. Pseudomonas.
(3) Many antibiotics are obtained from some species of bacteria like streptomyces, Bacillus etc.
(4) Many soil bacteria help in fixation of atmospheric nitrogen like Rhizobium (Symbiotic), Azotobacter (Free living).
(b) Archaebacteria
(1) Methane gas is produced from the dung of ruminants by the methanogens.
(2) Methanogens are also involved in the formation of biogas and sewage treatment.
How are viroids different from viruses?
Which of the following is not correct?
(a) Robert Brown discovered the cell.
(b) Schleiden and Schwann formulated the cell theory.
(c) Virchow explained that cells are formed from pre-existing cells.
(d) A unicellular organism carries out its life activities within a single cell.
What is a mesosome in a prokaryotic cell? Mention the functions that it performs.
What is a centromere? How does the position of centromere form the basis of classification of chromosomes. Support your answer with a diagram showing the position of centromere on different types of chromosomes.
Both lysosomes and vacuoles are endomembrane structures, yet they differ in terms of their functions. Comment.
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Both points for archaebacteria are similar
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Can you give us notes for every lessons of class 11 (cbse)?
Good But Stay main points and some points are confused us ......Nice job for Answers help Thanku
biology is limitless the more u try find the more u get confused ððð