Tag: bacteria; benefits and harmful effects

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Questions Related to bacteria; benefits and harmful effects

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

Which among the following is a bacterial disease?

  1. Rust of Tea

  2. Red rot of Sugarcane

  3. Citrus canker

  4. Late blight of Potato
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rust of Tea is also called as red rust disease. It is caused by algae Cephaleuros parasiticus Karst. It affects the tea plant. Red rot is a disease that affects the sugarcane plant. It is caused by fungus Glomerella tucumanensis. Citrus canker is a bacterial disease affecting Citrus species caused by the Xanthomonas axonopodis. It affects Citrus species like lime, orange. Late blight is an infection caused by fungus Phytophthora infestans. It affects potato and tomato.

Thus, the correct answer is 'Citrus canker.'

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

VFDF is produced by

  1. Lingbya

  2. Microcystis

  3. Aulosira

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

VFDF is also called as Very Fast Death Factor. It is an anatoxin produced by a cyanobacteria, Lingbya. It is a neurotoxin. It causes severe overstimulation of respiratory muscles. This ultimately can result in death.

Thus, the correct answer 'Lingbya.'

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

Match the lists.

I II
(a) Syphilis (i) Acetobacter
(b) Pathogen of cattle (ii) Agrobacterium
(c) Crown gall of apple (iii) Corynebacterium
(d) Diphtheria (iv) Mycobacterium
(v) Treponema

  1. a-(iii), b-(i), c-(iv), d-(ii)

  2. a-(v), b-(iv), c-(ii), d-(iii)

  3. a-(v), b-(iii), c-(ii), d-(i)

  4. a-(ii), b-(iv), c-(v), d-(iii)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Syphilis is caused by Treponema (a-v). Pathogens of cattle include Corynebacterium (b-iii). Crown gall of apple is caused by Agrobacterium (c-ii). Diphtheria is caused by Corynebacterium, but looking at the options, the correct pairing for Diphtheria is (iii) and cattle pathogen is (iv) Mycobacterium. Option B correctly maps a-v, b-iv, c-ii, and d-iii.

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

A plant disease which is not caused by a fungus is

  1. Red rot of Sugarcane

  2. Late blight of Potato

  3. Black rot of crucifers

  4. Brown rust of wheat
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Red rot disease is caused by the fungus Glomerella tucumanensis. It produces a structure called as acervuli. This results in profuse sporulation. Late blight of Potato is caused by fungus Phytophthora infestans. It infects and destroys the leaves, stems, fruits, tubers of potato and tomato plants. Black rot of crucifers is caused by bacterium Xanthomonas campestris. It results in dark brown discoloration of the leaves of fruit and vegetables. Wheat leaf rust is a disease caused by fungus Puccinia triticina. It affects wheat, barley and rye stems, leaves and grains. 

Thus, the correct answer is 'Black rot of crucifers.'

Multiple choice botany living world and classification of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects

Commercial lac is produced from .............

  1. The nest of a type of bird

  2. The exudation of a type of insect.

  3. The scale of a type of a fish

  4. The root of a plant
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Commercial lac is a resinous substance secreted by the lac insect (Laccifer lacca) on certain host trees. It is harvested and processed for use in varnishes and dyes.