Tag: bacteria - friend and foe

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

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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The interaction between Agrobacterium tumefaciens and plants is one of the most studied systems in plant-microbe interactions due to its ability to genetically transform plants.

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

Which one causes blight disease of rice?

  1. Xanthomonas oryzae

  2. Pseudomonas oryzae

  3. Erwinia oryzae

  4. Corynebacterium oryzae
Reveal answer Fill a bubble to check yourself
A Correct answer
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.'

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

Gas gangrene is caused by

  1. Streptococcus pyrogenes

  2. Treponema pallidum

  3. Clostridium perfringens

  4. Salmonella dublin
Reveal answer Fill a bubble to check yourself
C Correct answer
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.'

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

Harmful substances secreted by bacteria are known as 

  1. Antibiotics

  2. Toxins

  3. Antibodies

  4. Paratopes
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Little leaf disease and plant yellows are caused by

  1. Halobacterium

  2. Mycoplasma

  3. Bdellovibrios

  4. Chlamydia
Reveal answer Fill a bubble to check yourself
B Correct answer
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.'

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

Food poisoning is caused by

  1. Salmonella typhi

  2. Escherichia coli

  3. Clostridium botulinum

  4. Yersinia pestis
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

A bacterial disease is

  1. Tetanus

  2. Polio

  3. Filaria

  4. Malaria.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Trachoma is caused by

  1. Spirochaete

  2. Chlamydia

  3. Trichonympha

  4. Paramecium
Reveal answer Fill a bubble to check yourself
B Correct answer
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.