Economic Importance of Bacteria and Fungi ICSE Class-9

Selina Publishers Concise Biology Solutions Chapter-9

Economic Importance of Bacteria and Fungi ICSE Class-9 Selina Publishers Concise Biology Solutions Chapter-9 . We Provide Solutions of Progress Check , MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type Questions and Structured / Applications / Skill Type Questions of Exercise-9 Economic Importance of Bacteria and Fungi . Visit official Website CISCE  for detail information about ICSE Board Class-9.

Economic Importance of Bacteria and Fungi ICSE Class-9

(Selina Publishers Concise Biology Solutions Chapter-9 )


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Section-(A) Bacteria

Progress Check (page-85),

A.MULTIPLE CHOICE TYPE,

B.VERY SHORT ANSWER TYPE,

C.SHORT ANSWER TYPE,

D.LONG ANSWER TYPE

E. Structured /Application/Skill Type

Section-(B) Fungi

Progress Check (page-94),

A.MULTIPLE CHOICE TYPE,

B.VERY SHORT ANSWER TYPE,

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C.SHORT ANSWER TYPE,

D.LONG ANSWER TYPE

E. Structured /Application/Skill Type

Note :-  Before Viewing Concise Solutions of Economic Importance of Bacteria and Fungi Chapter-9. Read the whole chapter carefully with figure. Focus on useful and harmful bacteria, Vaccine, antibiotics. importance of Yeast.Focus on useful and harmful role of fungi.


Progress Check (page-85),Exe-9(A) Economic Importance of Bacteria and Fungi Concise Biology Solutions

Question 1

Name ……….bacteria

Answer 1

Cocci (Spherical)

Bacilli (rod shape)

Spirilla (Spiral Bacteria)

Vibrio (Comma shape)

Note : 4 name is given write any three name only


 A. MULTIPLE CHOICE TYPE, Exe-9(A) Economic Importance of Bacteria and Fungi Concise Biology Solutions 

Question 1

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Bacteria are no more classified as plants primarily because:

(a) these are unicellular

(b) these are microscopic

(c) many of them are parasitic

(d) they have no chlorophyll

Answer 1

(d) they have no chlorophyll

Question 2

A particular species of which one of the following, is the source bacterium of the antibiotic, discovered next to penicillin, for the treatment of tuberculosis?

(a) Escherichia

(b) Streptomyces

(c) Rhizobium

(d) Nitrobacter

Answer 2

(b)Streptomyces

Question 3

Which bacteria is rod shaped?

(a) Coccus

(b) Spirillum

(c) Bacillus

(d) Vibrio

Answer 3

(c) Bacillus

Question 4

Which bacteria fixes nitrogen in the soil?

(a) Nitrobacter

(b) Nitrosomonas

(c) Rhizobium

(d) Clostridium

Answer 4

(c)Rhizobium


B. VERY SHORT ANSWER TYPE ,Exe-9 (A) Economic Importance of Bacteria and Fungi Concise Biology Solutions

Question 1

Name the three common types of bacteria.

Answer 1

The three common types of bacteria are:

  1. Cocci (spherical bacteria)
  2. Bacilli (rod-shaped bacteria)
  3. Spirilla (spiral bacteria)

Question 2

Match the items in Column A with those in Column B.

Column A Column B
(i) Penicillium (a) Bacteria
occuring
in chains
(ii) Diplococci (b) Antibiotic
(iii) Streptococci (c) Bacteria
occurring
in pairs

 

Answer 2

Column A Column B
(i) Penicillium (b) Antibiotic
(ii)Diplococci (c) Bacteria occurring in pairs
(iii)Streptococci (a) Bacteria occuring in chains

C.SHORT ANSWER TYPE Exe-9(A) Economic Importance of Bacteria and Fungi Concise Biology Solutions 

Question 1

Would you consider the bacteria and yeast as plants? Give reason.

Answer 1

No, bacteria and yeast are not considered as plants because they do not have chlorophyll and their mode of nutrition is not autotrophic, which are characteristic features of plants.

Question 2

In what form bacteria may be present in the air?

Answer 2

Bacteria may be present in the form of spores in the air.

Question 3

Why is spore formation in bacteria not considered as a form of reproduction?

Answer 3

Spore formation in bacteria is not considered as a form of reproduction because bacteria reproduce only asexually by means of fission or cell division. Spore formation is just a method of escaping unfavourable conditions.

Question 4

In what respect do you consider bacteria as simple organisms?

Answer 4

Bacteria are unicellular organisms that lack membrane bound cell organelles like chloroplast, mitochondria, etc. and even a well-defined nucleus is absent which states that they have a simpler cellular organization.

Question 5

State the differences between

(a) Decay and Putrefaction

(b) Pasteurization and Sterilization

Answer 5

 

(a) differences between Decay and Putrefaction

 

Decay Putrefaction
1. It is the complete breakdown of organic matter by bacteria. 1. It is the incomplete breakdown of organic matter by bacteria.
2. Does not emit a foul smell 2. Emits a foul smell
(b) differences between Pasteurization and Sterilization

 

Pasteurization Sterilization
1. Temperature- 60C 1. Temperature- 110C
2. Does not kill spores 2. Kills even spores
3. Partial sterilization 3. Complete sterilization
E.g. Pasteurization of milk E.g. Sterilization of canned food

 

Question 6

Why is it generally advised that every living room in the house should get direct sunlight at least for a short time?

Answer 6

Direct sunlight contains ultraviolet radiations of the sun, which help in killing of mould spores present in air.

Question 7

Would there be any bacteria in an aquarium?

Answer 7

Yes, there would be bacteria in an aquarium


D. LONG ANSWER TYPE Exe-9(A) Economic Importance of Bacteria and Fungi Concise Biology Solutions 

Question 1

Both bacteria and yeast reproduce by asexual method, but how does this method differ in them?

Answer 1

Bacteria reproduce asexually by means of fission (binary fission), while yeast reproduces asexually by budding producing chains.

Question 2

Describe the role of micro-organisms in industrial production.

Answer 2

Role of micro-organisms in industrial production:

(1) Bacteria are used in the production of vinegar and in the processing of coffee, tobacco, etc.

(2) Different flavours of tea, coffee, etc. are produced by certain bacteria.

(3) Tanning of leather is basically brought about by sunlight, but there are a few micro-organisms which are involved in this process.

(4) Fibres used for making rope, linen, etc. are obtained by loosening the fibres of hemp and flax by retting, which involves the use of bacteria.

(5) Bacteria are used for the large-scale production of antibiotics, enzymes, hormones, serum, vaccines and toxoids.

Question 3

How do bacteria obtain their nourishment?

Answer 3

Modes of nutrition in bacteria:

  1. Autotrophic bacteria: Able to synthesize their own food
  2. Photoautotrophs: Contain chlorophyll and use light energy for the synthesis of food
  3. Chemoautotrophs: Obtain energy by oxidizing inorganic compounds
  4. Heterotrophic bacteria: Require organic compounds as their main source
  5. Saprophytes: Grow on dead and decaying organic matter
  6. Parasites: Obtain their food from living host on which they grow

Question 4

Describe any two uses of bacteria in industry.

Answer 4

Uses of bacteria in industry:

  1. Tea curing:Certain bacteria are used to produce different flavours of tea.
  2. Tanning of leather:Tanning of leather is basically brought about by sunlight, but there are a few bacteria which are involved in this process.

Question 5

What are antibiotics? Name any two examples.

Answer 5

Antibiotics are chemical substances produced by a living organism that kill or stop the growth of disease-causing micro-organisms such as fungi and bacteria.

Examples of antibiotics:

  1. Penicillin
  2. Streptomycin

Question 6

Is tinned and sealed food always safe to eat? Give reasons in support of your answer.

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