Tag: bacteria; benefits and harmful effects

Questions Related to bacteria; benefits and harmful effects

Xanthomonas citri is related to

  1. Disease in Xanthium

  2. Xanthophyceae

  3. A virus

  4. Citrus canker


Correct Option: D
Explanation:

Citrus canker is a disease that is caused by the bacterium Xanthomonas axonopodis. It affects the Citrus species of fruits such as lime, oranges, grapefruit. It results in the lesions on the leaves, stems, fruit and other parts of the citrus plants.

Thus, the correct answer is 'Citrus canker.' 

Which of the following organism can be a reason for abortion?

  1. Viruses

  2. Bacteria

  3. Mycoplasma

  4. Chlamydia


Correct Option: D
Explanation:

Abortion is the method of ending the pregnancy by removal of either embryo or foetus. Chlamydia is a sexually transmitted infection. Chlamydia may result into Pelvic Inflammatory Disease (PID). It can lead to serious consequences like infertility, ectopic pregnancy and even abortion.

Thus, the correct answer is 'Chlamydia.'

Trachoma is caused by

  1. Spirochaete

  2. Chlamydia

  3. Trichonympha

  4. Paramaecium


Correct Option: B
Explanation:

Trachoma is an infectious disease caused by bacterium Chlamydia trachomatis. It results in the roughening of the inner surface of the eyelids. The symptoms include pain in the eyes, itching and irritation in the eyes, blindness. It is a contagious disease.

Thus, the correct answer is 'Chlamydia.'

The disease crown gall is caused by

  1. Algae

  2. Fungi

  3. Virus

  4. Bacteria


Correct Option: D

The infectious and contagious bacterial disease that affects cattle, buffaloes, horses, sheep and goats is

  1. Anthrax

  2. Necrosis

  3. Tick fever

  4. Rinderpest


Correct Option: A
Explanation:

Anthrax is an infectious disease caused by bacterium Bacillus anthracis. It mainly affects rudiments like cattle, buffaloes, horses, sheep. It rarely occurs in humans. Symptoms include sore throat, mild fever, fatigue, muscle aches.

Thus, the correct answer is 'Anthrax.'

Blast of rice is caused by

  1. Xanthomonas

  2. Pseudomonas

  3. Phytophthora

  4. Gibberella


Correct Option: A

Which of the following sets of diseases are caused by bacteria

  1. Herpes and influenza

  2. Cholera and tetanus

  3. Typhoid and small pox

  4. Tetanus and mumps


Correct Option: B

The most well studied bacterial-plant relationship is that of

  1. Cyanobacterial symbiosis with some aquatic ferms

  2. Nodulation in Sesbania stem

  3. Gall formation by Agrobacterium

  4. Growth stimulation by phosphate bacteria


Correct Option: C

Which one causes blight disease of rice?

  1. Xanthomonas oryzae

  2. Pseudomonas oryzae

  3. Erwinia oryzae

  4. Corynebacterium oryzae


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

  1. Streptococcus pyrogenes

  2. Treponema pallidum

  3. Clostridium perfringens

  4. Salmonella dublin


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.'