comprehensive question set on the Economic Importance of Bacteria for ICSE Class 9 🌿🦠
Multiple Choice Questions (MCQs) 🌟
Question 1
Bacteria are no longer classified as plants primarily because:
a) These are unicellular and prokaryotic 🦠
b) These are motile 🚶♂️
c) Many of them are parasitic 🧬
d) They have no chlorophyll 🍃
Answer:
Question 2
A particular species of which bacterium is the source of the antibiotic discovered after penicillin for treating tuberculosis?
a) Escherichia 🧪
b) Streptomyces 💊
c) Rhizobium 🌱
d) Nitrobacter 🧬
Answer:
Question 3
Which bacteria are rod-shaped?
a) Coccus ⚪
b) Spirillum 🔄
c) Bacillus ➖
d) Vibrio 🌊
Answer:
Question 4
Which bacteria fix nitrogen in the soil?
a) Nitrobacter 🌿
b) Nitrosomonas 🌱
c) Rhizobium 🌼
d) Clostridium 🧪
Answer:
Question 5
What is the main component that makes up the bacterial cell wall?
Question 6
Which structure is freely floating within the cytoplasm of a bacterial cell?
Question 7
Bacteria mainly reproduce by:
a) Multiple fission ✂️
b) Budding 🌱
c) Binary fission ➗
d) Regeneration 🔁
Answer:
Question 8
Bacteria are referred to as prokaryotes because:
a) They have no chlorophyll 🍃
b) They are unicellular 🦠
c) They are free-living 🌍
d) Because they lack a distinct nucleus enclosed by a nuclear membrane. 🚫🔬
Answer:
Question 9
Which disease can be avoided through the use of the TAB vaccine?
a) Tuberculosis 🫁
b) Typhoid 🤒
c) Tetanus 💉
d) Taeniasis 🪱
Answer:
Question 10
A preparation consisting of weakened or dead germ substances is known as:
a) Toxins ☠️
b) Antitoxins 🛡️
c) Toxoids 🧪
d) Vaccines 💉
Answer:
Very Short Answer Type ✍️
Question 1
Name the following:
(a) Name the structure that helps bacteria move through water. 🏊♂️
(c) What is the term for the process of converting animal skin into leather? 🐄
(e) Who is the scientist credited with the discovery of streptomycin? 👨🔬
(b) The process of flavoring tea by certain bacteria. 🍵
(d) Bacterial disease of mustard. 🌿
Question 2
Match the terms in Column A with their corresponding pairs in Column B.
| Column A | Column B |
| Penicillium | Antibiotic 💊 |
| Diplococci | Bacteria occurring in pairs 🦠🦠 |
| Streptococci | Bacteria occurring in chains 🔗 |
Question 3
(a) Who discovered the first antibiotic, penicillin? 👨🔬
(b) Which type of bacteria lives in root nodules of leguminous plants? 🌱
(c) Which hormone was first produced using Escherichia coli? ⚗️
(e) Name two heterotrophic ways through which bacteria obtain nutrition. 🍽️
(d) __________ is an example of denitrifying bacteria. 🌿
Question 4
Name the bacteria that convert:
(a) Ammonium compounds to nitrites: __________ 🔁
(b) Nitrites to nitrates: __________ ➕
Short Answer Type 📝
Question 1
In what form may bacteria be present in the air? 🌬️
Question 2
Question 2
Why isn’t the formation of spores in bacteria classified as a method of reproduction? ⚪
Question 3
Why are bacteria considered to be simple organisms? 🦠
Question 4
Define the following terms:
(a) Antibiotics 💊
(b) Antitoxins 🛡️
(c) Serum 💉
(d) Botulism ⚠️
(e) Pasteurization 🔥
Question 5
Give two examples of each:
(a) Bacterial diseases of cattle 🐄
(b) Bacterial diseases in plants 🌿
(c) Bacterial diseases in humans 👩⚕️
(d) Nitrifying bacteria 🧪
(e) Give examples of free-living bacteria that fix nitrogen in the soil. 🌱
Question 6
Expand the following abbreviations.
(a) TAB 🔬
(b) BCG 💉
(c) DNA 🧬
(d) GMO 🌽
Question 7
Give reasons for the following:
(a) Why should every room receive some direct sunlight daily? ☀️
(b) Why might canned or sealed food still be unsafe to eat? 🍲
Question 8
State the differences between:
(a) Decay and putrefaction 🔄☠️
(b) Pasteurization and sterilization of food/objects/equipment 🔥⚗️
Question 9
Would there be any bacteria in an aquarium? 🐠
Long Answer Type 📝
Question 1
How do bacteria obtain their nourishment? 🍽️
Question 2
Explain any two industrial applications of bacteria. 🏭
Question 3
What are antibiotics? Name any two examples. 💊
Question 4
Explain the process by which leguminous plants transform atmospheric nitrogen into nitrates. 🌿
Question 5
Describe how nitrates present in the soil are transformed back into atmospheric nitrogen. 🔄
