Samacheer Kalvi 8th Science Unit 16 Book Back Answers:

Samacheer Kalvi 8th Standard New Science Book Back 1 Mark and 2 Mark Question & Answers PDF uploaded and available below. Class 8 New Syllabus 2021 to 2022 Book Back Question & Answer available for both English and Tamil Mediums. Class 8th Science Book Unit 16 – Micro Organisms Answers/Solutions are provided on this page. 8th Std Science Book consists of 23 units, All Science Book Back One, and Two Mark Solutions are given below.

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Samacheer Kalvi 8th Science Book Back Solutions PDF:

8th Science Subject 1 Mark and 2 Mark Solutions PDF available below. Click the Download option to download the book back 1 Mark & 2 Mark questions and answers. Take the printout and use it for exam purposes. Samacheer Kalvi 8th Science Unit 16 Answers are given below.

Science Book Back Answers

Unit 16 – Micro Organisms

I. Choose the best answer:

1. Micro organisms are measured in ……………..
(a) cm
(b) mm
(c) micron
(d) meter.
Answer:
(c) micron

2. Shows both living and non-living characteristics ………………
(a) Protozoa
(b) Virus
(c) Bacteria
(d) Fungi
Answer:
(b) Virus

3. ……………. is a prokaryotic micro organisms.
(a) Virus
(b) Algae
(c) Fungi
(d) Bacteria
Answer:
(d) Bacteria

4. Based on shape, the bacteria are classified into …………….. types.
(a) 2
(b) 3
(c) 4
(d) 5
Answer:
(c) 4

5. The plant body of algae is called as ………………
(a) Stem
(b) Thallus
(c) Leaf
(d) Root
Answer:
(b) Thallus

II. Fill in the blanks

1. ……………… is prepared from a mould called Penicillium.
2. ……………… are the infectious protein particles.
3. The infect virus particle found outside the host cell is ………………
4. Micro organism can be seen with the help of a ………………
5. Bacteria, which have a flagellum at one end is classified as ………………

Answer:

1. Penicillin
2. Prions
3. Virion
4. Microscope
5. Monotrichous

III. True or False

1. Diseases causing micro organisms are called pathogens.
Answer:
True.

2. Female Anopheles mosquito is a carrier of dengue virus.
Answer:
False.
Correct statement:
Female Anopheles mosquito is a carrier of malaria.

3. Chicken pox is a communicable disease.
Answer:
True.

4. Citrus canker is transmitted by insects.
Answer:
True.
Correct statement:
Citrus canker is transmitted by air and water

5. Yeast is used in the large scale production of alcohol.
Answer:
True.

IV. Match the following

Answer:

1 – e; 2 – d; 3 – b; 4 – c; 5 – a

V. Answer the following questions:

Direction:
In each of the following questions, a statement of Assertion is given and a corresponding statement of Reason is given just below it. Of the four statements, given below, mark one as the correct answer.
(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are true and Reason is not the correct explanation of Assertion.
(c) If Assertion is true but Reason is false.
(d) If both Assertion and Reason are false.

1. Assertion : Malaria is caused by Protozoa.
Reason : The disease is transmitted by mosquito.
Answer:
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion

2. Assertion : Algae are heterotrophic.
Reason : They don’t have chlorophyll.
Answer:
(d) Both Assertion and Reason are false

VI. Answer very briefly:

1. Write the name of any nitrogen fixing bacteria.
Answer:
Rhizobium.

2. Name the bacteria used in the production of vinegar.
Answer:
Acetobacter aceti.

3. Write the names of any three protozoans.
Answer:

1. Amoeba
2. Plasmodium
3. Paramecium.

4. Who discovered penicillin?
Answer:
Alexander Flemming.

5. Which diseases can be prevented by vaccination?
Answer:
Small pox, polio, measles, mumps, rubella, tuberculosis.

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