8th Standard Syllabus & Materials
8th Standard
TN 8th Tamil இயல் 3 - கல்வி கரையில - வினைமுற்று Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 2 - ஈடில்லா இயற்கை - மயங்கொலிகள் Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 2 - ஈடில்லா இயற்கை -பட்டமரம் Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 2 - ஈடில்லா இயற்கை - இயற்கையை போற்றுவோம் Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 1 - தமிழ் இன்பம் - ஆழிக்கு இணை Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 2-ஈடில்லா இயற்கை - திருக்குறள் Important Questions And Answers Study Material - QB365 Set A
Published on: 31/07/2019
Micro Organisms
Download Tamil Nadu 8th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
__________ is an acid - loving bacteria
Lactobacillus acidophilus
Pseudomonas
Xanthomonas
Vibrio cholera
2.
Common cold in human is caused by __________
plasmodium
influenza
vibrio cholera
aphthovirus
3.
_________is a ball-shaped bacteria.
Bacilli
Spinilla
Cocci
Vibrio
4.
Based on shape, the bacteria are classified into _______ types.
2
3
4
5
5.
______ is a prokaryotic micro organisms.
Virus
algae
fungi
bacteria
6.
Micro organisms are measured in ______.
cm
mm
micron
meter
7.
African sleeping sickness is spread by the bite of the__________
8.
__________ Vaccine is used to cure foot and mouth disease
9.
Bacteria, which have a flagellum at one end is classified as _______.
10.
The infact virus particle found outside the host cell is _______.
11.
_______ is prepared from a mould called Penicillium.
12.
Spirilla
13.
Biogas
14.
Edward Jenner
15.
Tuberculosis
16.
Nitrogen fixing bacteria
17.
Give any 2 living characters of virus.
18.
Who discovered penicillin?
19.
Write the names of any three protozoans.
20.
Write the name of any nitrogen fixing bacteria.
21.
Why micro organisms are essential for agriculture?
22.
Write the four types of bacteria, based on their shape.
23.
Write a short note on Probiotics.
24.
Write a short note on bacteria and its structure.
25.
Trichoderma helps to protect roots and central plant pathogens
26.
Hyphae help in transport of nutrients for the growth of mushroom.
27.
The size of bacteria range from 1μm to 5 μm
28.
Algae: Grass of water; Lactobacillus: ________
29.
Euglena: Protozoan; Albugo: _________
1.
(a)
Lactobacillus acidophilus
2.
(b)
influenza
3.
(c)
Cocci
4.
(c)
4
5.
(d)
bacteria
6.
(c)
micron
7.
( )
tsetse fly
8.
( )
FMD Vaccine
9.
( )
Monotrichous
10.
( )
Virion
11.
( )
Penicillin
12.
Helicobacer
13.
Methanogens
14.
Vaccine
15.
Bacteria
16.
Ryizobium
17.
i. They respond to heat, chemicals, and radiations.
ii. They show irritability.
18.
Sir Alexander Fleming discovered penicillin
19.
i) Plasmodium
ii) Paramecium
iii) Euglena
20.
i) Rhizobium,
ii) cyanobacteria and
iii) Nostoc.
21.
a) Natural fertilizer:
Micro organisms act upon degradable waste and making the soil fertile.
b) Nitrogen fixation
Rhizobium bacteria living in the root nodules of leguminous plants enrich the soil by fixing the atmospheric nitrogen as nitrates.
c) Bio control agents:
Bacillus thuringiensis control insects trichoderma protects, roots and control plant pathogens. Baculoviruses attack insects and other arthropods.
(OR)
Microorganisms make compost from degradable waste, fix the atmospheric nitrogen.
22.
i) Bacilli - Rod shaped bacteria.
Eg. Bacillus anthracis
ii) Spirilla - Spiral shaped bacteria.
Eg. Helicobacter pylori.
iii) Cocci - Spherical or ball shaped bacteria
Eg. Streptococus pneumoniae
iv) Vibrio - Comma shaped bacteria
Eg. Vibrio cholera
23.
Probiotics are live food supplements used in yoghurt and other fermented milk products. Eg. Lactobacillus acidophilus and Bifidobacterium bifidum. These bacteria improve the microbial spectrum in the gut and thus contribute to the following effects.
1. Decrease the risk of colon cancer.
2. Decrease cholesterol absorption.
3. Prevent diarrhoeal diseases by increasing the immunity power.
24.
Bacteria are single-celled prokaryotes (cells without nuclei). They are considered to be the first living organisms on earth. Bacteria are grouped under the Kingdom Monera. The study of bacteria is called Bacteriology. The size of bacteria range from 1 μm to 5 μm (micrometer). Bacteria are of two types based on respiration
i) Aerobic bacteria (requires oxygen)
ii) Anaerobic bacteria (Does not requires oxygen)
Cell Structure:
A bacterium has on outer covering known as the cell wall. Nuclear material is represented by a nucleoid without nudear membrane. An extra chromosomal DNA called plasmid is present in the cytoplasm. Protein synthesis is carried out by 70 S ribosomes. Other cell organelles (mitochondria, golgi body, endoplasmic reticulum etc.) are absent flagella aid in locomotion.
25.
True
26.
True
27.
True
28.
Acid -living bacteria
29.
fungi
8th Standard Syllabus & Materials
8th Standard
TN 8th Tamil இயல் 3 - கல்வி கரையில - பாடறிந்து ஒழுகுதல் Important Questions And Answers Study Material - QB365 Set A
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NEW8th Standard
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Tamilnadu Stateboard 8th Standard Subjects
Tamilnadu Stateboard Standards
