World Of Microbes Book Back Questions 9th Science Lesson 22

9th Science Lesson 22

22] World Of Microbes

Book Back Questions with Answer and Do You Know Box Content

Do You Know?

Antonie Van Leeuwenhoek, the first microbiologist designed his own microscope. In 1674, he took plaque from his own teeth and observed it under the microscope. He was astonished to see many tiny organisms moving around, which was otherwise invisible to naked eyes.

The protein free pathogenic RNA of virus is Viroids. They are found in plant cells and cause disease in plants.

World health Day – 7^th April

World malaria day – 25^th April

World AIDS day – 1^st December

World Anti – Tuberculosis day-24^th March

Robert Koch (Father of Bacteriology) is the first German physician to study how pathogens cause diseases. In 1876, he showed that the disease called anthrax of sheep was due to Bacillus Anthracis which exist in pastures in the form of protective spores.

Sir Ronald Ross, an Indian born British doctor, is famous for his work concerning malaria. He worked in the Indian Medical Service for 25 years. He identified the developing stages of malarial parasite in the gastrointestinal tract of mosquito and proved that malaria was transmitted by mosquito. In 1902, he received the Nobel Prize for Physiology or Medicine for his work on the transmission of malaria.

An extraction of tender leaves of papaya and herbal drink. Nilavembu Kudineer is given to dengue patients. It is known to increase the blood platelet count. (Source: AYUSH).

Swine flu first surfaced in April 2009 and affected millions of people. Then in June 2009 it was declared a pandemic by the World Health Organization (WHO). In 2015, India reportedly had over 31,000 people infected and 1,900 resulting deaths.

The avian influenza virus A (H5N1) emerged in 1996. It was first identified in Southern China and Hong Kong. H5N1 was first discovered in humans in 1997 by World Health Organisation. First outbreak was in December 2003.

HIV was first recognised in Hatai (USA) in 1981. In India the first confirmed evidence of AIDS infection was reported in April 1986 from Tamil Nadu. The AIDS vaccine RV 144 trial was conducted in Thailand in 2003 and reports were presented in 2011.

The process of vaccination was introduced by Edward Jenner. According to the World Health Organisation (WHO), Jennerian vaccination has eliminated small pox totally from the human population.

Louis Pasteur is an 18^th century French chemist and microbiologist. He coined the term vaccine. Pasteur developed vaccine against chicken pox, cholera, anthrax, etc.

Choose the best answers:

1. Which of the following is transmitted through air?

(a) Tuberculosis

(b) Meningitis

(c) Typhoid

(d) Cholera

2. One of the means of indirect transmission of a disease is

(a) Sneezing

(b) Coughing

(c) Vectors

(d) Droplet infection

3. Diptheria affects the

(a) Lungs

(b) Throat

(c) Blood

(d) Liver

4. The primary organ infected during tuberculosis is

(a) Bone marrow

(b) Intestine

(c) Spleen

(d) Lungs

5. Microbes that generally enter the body through nose are likely to affect

(a) Gut

(b) Lungs

(c) Liver

(d) Lymph Nodes

6. The organ affected by jaundice is

(a) Liver

(b) Lungs

(c) Kidney

(d) Brain

7. Poliomyelitis virus enters the body through

(a) Skin

(b) Mouth and nose

(c) Ears

(d) Eye

Fill in the blanks:

1. ______________ break down organic matter and animal waste into ammonia.

2. Typhoid fever is caused by ___________.

3. H1N1 virus causes __________.

4. ___________ is a vector of viral disease dengue.

5. ________ vaccine gives considerable protection against tuberculosis.

6. Cholera is caused by ___________ and malaria is caused by __________.

Expand the following:

1. ORS 2. HIV 3. DPT 4. WHO 5.BCG

Pick out the odd one:

i) AIDS, Retrovirus, Lymphocytes, BCG.

ii) Bacterial disease, Rabies, Cholera, Common cold and influenza.

State true or false. If false, correct the statement:

1. Rhizobium, associated with root nodules of leguminous plants fixes atmospheric nitrogen.

2. Non-infectious diseases remain confined to the person who develops the disease and do not spread to others.

3. The process of vaccination was developed by Jenner.

4. Hepatitis B is more dangerous than Hepatitis A.

Match the following:

1. Swine flu – Human Papilloma virus

2. Genital warts – Human Immunodeficiency Virus

3. AIDS – Mycobacterium

4. Tuberculosis – Influenza virus H1N1

Consider the statements given below and choose the correct option:

Mark the correct statement as:

(a) If both A and R are true and R is correct Explanation of A.

(b) If both A and R are true but R is not the correct explanation of A.

(c) If A is true but R is false.

(d) If both A and R are false.

1. Assertion: Chicken pox is a disease indicated by scars and marks in the body.

Reason: Chicken pox causes rashes on face and further spreads throughout the body.

2. Assertion: Dengue can be treated by intake of antibiotics.

Reason: Antibiotics blocks the multiplication of viruses.

Answers:

Choose the best answers:

1. Tuberculosis 2. Vectors 3. Throat 4. Lungs 5. Lungs 6. Liver 7. Mouth & nose

Fill in the blanks:

1. Nitrification 2. Salmonella typhi 3. Swine flue 4. Aedes aegypti mosquito 5. BCG 6. Vibrio cholerae, Plasmodium

Expand the following:

1. Oral Rehydration Solution 2. Human Immunodeficiency virus 3. Dipetheria, Pertussis and tetanus

4. World Health Organization 5. Bacillus Calmette Guerin

Pick out the odd one:

1. BCG 2. Rabies

State true or false. If false, correct the statement:

1.True

2.True

3.True

4.True

Match the following:

1.Swine flu- Influenza virus H1N1

2.Genital warts- Human Papilloma virus

3.AIDS- Human Immunodeficiency Virus

4.Tuberculosis- Mycobacterium

Consider the statements given below and choose the correct option:

1.If both A and R are true and R is correct explanation of A

2.If both A and R are false.