FRANK Solutions for Class 9 Biology Chapter 14 - Bacteria and Fungi: Their Importance
Get Frank Solutions for ICSE Class 9 Biology Chapter 14 Bacteria and Fungi: Their Importance on TopperLearning. Prepare for your exam by revising important concepts such as gram-positive bacteria, fungi, yeast and more. Learn to draw and explain the working of a bacterial cell with the aid of our expert solutions.
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Chapter 14 - Bacteria and Fungi: Their Importance 127
(b) The bacteria which do not get stained with crystal violet and iodine solution are called gram negative bacteria while those bacteria which get stained with crystal violet and iodine solution are called gram positive bacteria.
(b) Spore formation helps bacteria to survive during adverse environmental conditions. Hence it is a survival technique.
(c) Bacteria as friends :
Bacteria are useful to us in many ways like producing antibiotics, forming curd and cheese, tanning leather, producing various industrial products, nitrogen fixation, digesting cellulose etc.
Bacteria as foes:
They are harmful in many ways like causing diseases, bio-weapons , food spoilage etc.
(d) Yeast is used in breweries since the fermentation activity of yeast produces different types of beverages like wine, beer, alcohol toddy etc. In bakeries, when yeast is added to the flour its fermentation results in the production of carbon dioxide which produces soft bread and other bakery products.
Chapter 14 - Bacteria and Fungi: Their Importance 128
Also yeast is used in preparing idli and dosa from a mixture of powdered rice and dal.
For example: Penicillin is obtained from the fungus Penicillium notatum.
Griseofulvin is extracted from the fungus Penicillium griseofulvum.
(ii) (a) bacteria
(iii) (b) Bacillus
(iv) (a) Tuberculosis
(v) (d) Rhizobium
(vi) (b) Lactobacillus
(vii) (d) Agaricus
(viii) (a) ethyl alcohol
(b) Aspergillus fumigatus
(c) Candida albicans
(c) obligate aerobes
(d) Agaricus campestris
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