Tag: useful and harmful bacteria

Questions Related to useful and harmful bacteria

Blast of rice is caused by

botany bacteria bacteria - friend and foe useful and harmful bacteria bacteria; benefits and harmful effects

  1. Xanthomonas

  2. Pseudomonas

  3. Phytophthora

  4. Gibberella

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Correct Option: A

Which of the following sets of diseases are caused by bacteria

botany bacteria bacteria - friend and foe useful and harmful bacteria bacteria; benefits and harmful effects

  1. Herpes and influenza

  2. Cholera and tetanus

  3. Typhoid and small pox

  4. Tetanus and mumps

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Correct Option: B

The most well studied bacterial-plant relationship is that of

botany bacteria bacteria - friend and foe useful and harmful bacteria bacteria; benefits and harmful effects

  1. Cyanobacterial symbiosis with some aquatic ferms

  2. Nodulation in Sesbania stem

  3. Gall formation by Agrobacterium

  4. Growth stimulation by phosphate bacteria

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Correct Option: C

Which one causes blight disease of rice?

botany bacteria bacteria - friend and foe useful and harmful bacteria bacteria; benefits and harmful effects

  1. Xanthomonas oryzae

  2. Pseudomonas oryzae

  3. Erwinia oryzae

  4. Corynebacterium oryzae

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Correct Option: A
Explanation:

Blight disease of Rice is a deadly disease that affects the cultivated rice. It is caused by bacteria Xanthomonas oryzae. It causes wilting of seedlings and yellowing and drying of leaves.

Thus, the correct answer is 'Xanthomonas oryzae.'

Gas gangrene is caused by

botany bacteria bacteria - friend and foe useful and harmful bacteria bacteria; benefits and harmful effects

  1. Streptococcus pyrogenes

  2. Treponema pallidum

  3. Clostridium perfringens

  4. Salmonella dublin

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Correct Option: C
Explanation:

Gas gangrene is caused by the Clostridium perfringens bacterium. This produces gas in tissues in gangrene. It results in the swelling.  The skin turns pale to brownish-red. 

Thus, the correct answer is 'Clostridium perfringens.'

Harmful substances secreted by bacteria are known as 

botany bacteria bacteria - friend and foe useful and harmful bacteria bacteria; benefits and harmful effects

  1. Antibiotics

  2. Toxins

  3. Antibodies

  4. Paratopes

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Correct Option: B
Explanation:

Toxin is the harmful substance secreted by bacteria. It affects the immune system of the host. It causes infection and disease in the host by damaging the tissues. Paratope is an antigen-binding site present on the antibody. 

Thus, the correct answer is option B.

Little leaf disease and plant yellows are caused by

botany bacteria bacteria - friend and foe useful and harmful bacteria bacteria; benefits and harmful effects

  1. Halobacterium

  2. Mycoplasma

  3. Bdellovibrios

  4. Chlamydia

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Correct Option: B
Explanation:

Little leaf disease is a disease that affects brinjal. Symptoms include reduction in leaf size and rosette like appearance. It is transmitted by leafhopper. It is caused by Mycoplasma. Apart from this, Mycoplasma also causes witches' broom disease and plant yellows diseases.

Thus, the correct answer is 'Mycoplasma.'

Food poisoning is caused by

botany bacteria bacteria - friend and foe useful and harmful bacteria bacteria; benefits and harmful effects

  1. Salmonella typhi

  2. Escherichia coli

  3. Clostridium botulinum

  4. Yersinia pestis

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Correct Option: C
Explanation:

Food poisoning or botulism is caused by Clostridium botulinum. It is an anaerobic bacterium. The bacterium infects canned food. The poisoning is accompanied by diarrhoea and vomiting. Common food poisoning is caused by Staphylococcus aureus.

A bacterial disease is

botany bacteria bacteria - friend and foe useful and harmful bacteria bacteria; benefits and harmful effects

  1. Tetanus

  2. Polio

  3. Filaria

  4. Malaria.

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Correct Option: A
Explanation:

Tetanus is a bacterial disease. It is also known as Lock Jaw. Tetanus is caused by Clostridium tetani. It is a bacilus bacteria.
Polio is a viral disease. It is also known as poliomylelitis. It is caused by polio virus. The virus spreads from person to person.
Filaria is a parasitic diseases which is transmitted by mosquito and flies. It is caused by Wucheria bancrofti and Wucheria malayi.
Malaria is a protozoan disease. It is caused by a plasmodium. It is transmitted by female Anopheles mosquito.

Trachoma is caused by

botany bacteria bacteria - friend and foe useful and harmful bacteria bacteria; benefits and harmful effects

  1. Spirochaete

  2. Chlamydia

  3. Trichonympha

  4. Paramecium

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Correct Option: B
Explanation:

Trachoma is a bacterial infection. It is caused by bacteria Chlamydia trachomatis. It is an eye infection. It causes itching and irritation of eyes. In severe condition, it may result in blindness.

Thus, the correct answer is option B.