Harmful and Useful Bacteria

Q.

Which one of the following diseases is not caused by bacteria?

1. Typhoid

2. Anthrax

3. Tuberculosis

4. Malaria

Q.

__________ is used in making curd.

Q.

Diseases that can spread from an infected person to a healthy person through the air, water, food or physical contact, are called communicable diseases.

1. True

2. False

Q.

What Is Anthrax?

Q.

Fermentation processes include the formation of curd by bacteria.

1. True

2. False

Q. Describe 5 harmful effects of bacteria in humans.

Q. Tuberculosis is caused by a ________ .

1. virus
2. bacteria
3. fungi
4. protozoa

Q.

Statement 1 Angular leaf spot in cotton is caused by Xanthomonos species

Statement 2: Bacteria can cause disease in plants

1. Statement 1 is false and statement 2 is true

2. Statement 1 is true and statement 2 is false

3. Both the statements are false

4. Both the statements are true

Q.

The viral disease hydrophobia is associated with

1. Cattle

2. Poultry

3. Fishes

4. Bees

Q.

Choose the correct option.

Assertion: Viruses are classified as living organism.

Reason: They have very simple, cellular structure and cannot exist independently.

1. Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
   

2. Both Assertion and Reason are correct. But Reason is not the correct explanation of Assertion.

3. Both Assertion and Reasons are incorrect.

4. The Assertion is incorrect but Reason is correct.
   

Q.

Differentiate between deficiency diseases and those caused by microorganisms.

Q.

Lactobacilli are harmful bacteria.

1. True
2. False

Q.

What are the symptoms of lung infection ?

Q.

Anthrax of sheep is caused by bacteria.True or false?

Q.

Choose the correct alternative.

The disease, elephantiasis is caused by a parasite called _________.

1. Taenia solium

2. Ascariasis lumbricoides

3. Wuchereria bancrofti

4. Salmonella typhi

Q.

Decomposers feed on the dead remains of animals.

1. True
2. False

Q.

Are all bacteria pathogenic?

Q.

Is snail a decomposer?

Q.

Assertion — Viruses can be seen with the help of an electron microscope.
Reason — It is much smaller than bacteria.

1. If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

2. If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

3. If Assertion is correct but Reason is incorrect.

4. If Assertion is incorrect but Reason is correct.

Q. Which of the following bacteria infests canned food?

1. Clostridium botulinum
2. Salmonella
3. Staphylococcus aureus
4. Rhizopus

Q.

Match the following and select the right answer:

(i) Measles	(a) Protozoa
(ii) Cholera	(b) Virus
(iii) Kala-azar	(c) Bacteria

1. i-a, ii-c, iii-b

2. i-a, ii-b, iii-c

3. i-b, ii-a, iii-c

4. i-b, ii-c, iii-a

Q.

Which of the following disease is caused by viruses?

1. All the above

2. Smallpox

3. Citrus Canker

4. Dengue

Q.

What is use of microorganisms?

Q.

Regarding Assertion and Reason, select the option that is correct.

Assertion: Viruses are classified as living organism.

Reason: They have very simple, non-cellular structure and cannot exist independently.

1. Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

2. Both Assertion and Reason are correct. But Reason is not the correct explanation of Assertion.

3. Both Assertion and Reasons are incorrect.

4. The Assertion is incorrect but Reason is correct.

Q.

A pathogen that causes ringworm

Q. Citrus canker is a plant disease caused by a microorganism which belongs to group 'X'. The other microorganism of this group are responsible for causing human disease like

1. Tuberculosis and cholera
2. Hepatitis A and chicken
3. Measkes and polio
4. Typhoid and polio

Q.

Are blue algae bad for humans?

Q. Which one causes blight disease of rice?

1. Xanthomonas oryzae
2. Pseudomonas oryzae
3. Erwinia oryzae
4. Corynebacterium oryzae

Q.

Regarding the assertion and reason, select the option that is correct.

Assertion: Viruses are classified as living organisms.

Reason: They have very simple, non-cellular structures and cannot exist independently.

1. Both assertion and reason are correct but reason is not the correct explanation of the assertion.

2. Both assertion and reason are correct and reason is the correct explanation of assertion.
   

3. Both assertion and reasons are incorrect.

4. The assertion is incorrect but the reason is correct.
   

Q. Agrobacterium tumefaciens causes

1. Wilt
2. Damping off
3. Rust
4. Crown gall