Chapter 14 : Bacteria and Fungi: Their Importance - Frank Solutions for Class 9 Biology ICSE
Chapter 14 - Bacteria and Fungi: Their Importance Excercise 127
(b) Gram negative and Gram positive bacteria.
(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.
(a) Bacteria is a plant.
(b) Spore formation is a survival technique not a mode of reproduction in bacteria.
(c) Bacteria are our friends and foes both.
(d) Yeast is used in bakeries and breweries.
(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.
(a) Shape of bacteria
(b) Flagellation in bacteria
(c) Economic importance of yeast
(d) Structure of Rhizopus
Chapter 14 - Bacteria and Fungi: Their Importance Excercise 128
(a) Bacteria and Yeast
(b) Gram positive and Gram negative bacteria
(c) Rhizopus and Mucor
(d) Parasitic and Saprophytic bacteria
(a) fungus that gives penicillin.
(b) mould that causes Aspergillosis in human beings.
(c) mould which is known as Red-ring mould.
(d) mould that causes lung mycosis.
(b) Aspergillus fumigatus
(c) Candida albicans
(a) The cell-wall of fungi is made up of ______.
(b) The fungi are ______ in their mode of nutrition.
(c) Bacteria which cannot live without oxygen is called ______.
(d) Fungi which is edible is ______.
(c) obligate aerobes
(d) Agaricus campestris
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.
(i) Which scientist first discovered the bacteria?
(d) De Vries
(ii) Bacteriology is the study of
(iii) Which bacteria is rod-shaped?
(d) None of these
(iv) Which disease is caused by bacteria?
(d) None of these
(v) Which fixes the atmospheric nitrogen?
(vi) Which bacteria is useful in fermentation of milk?
(a) Hay bacillus
(c) Aceto bacillus
(vii) Tasteful food for man is
(viii) Yeast is used in the production of
(a) ethyl alcohol
(b) acetic acid
(ii) (a) bacteria
(iii) (b) Bacillus
(iv) (a) Tuberculosis
(v) (d) Rhizobium
(vi) (b) Lactobacillus
(vii) (d) Agaricus
(viii) (a) ethyl alcohol
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