Biology

Microbes and Plant Diseases

1,145 Questions

Microbes and plant diseases examine the role of fungi, bacteria, and viruses in causing infections in plants and humans. Topics cover symbiotic associations like mycorrhiza, fungal structures, and specific agricultural pathogens. Practice these biology questions to master microbiology concepts for upcoming competitive examinations.

Fungal associationsPlant pathogensMicrobial structuresBacterial infections

Microbes and Plant Diseases Questions

Multiple choice bio-chemistry immunology fungal diseases fungal, protozoan and worm diseases useful and harmful microbes

Athlete's foot is also called 

  1. Tinea pedis

  2. Tinea capitis

  3. Rickettsia

  4. Candida albicans
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Athlete's foot is a fungal infection that affects the upper layer of the skin of the foot, especially when it is warm, moist and irritated.
  • It is caused by the fungus 'Trichophyton'.
  • Trichophyton rubrum is the most common fungus that causes Athlete's foot.
  • Symptoms include Itching and burning, dry skin, scaling, Inflammation, Blisters lead to cracking of the skin.
  • Athlete's foot is also called as Tinea pedis, Tinea pedum, Ringworm of the foot.
  • So, the correct answer is 'Tinea pedis'.
Multiple choice bio-chemistry immunology fungal diseases fungal, protozoan and worm diseases useful and harmful microbes

Ringworms are caused by 


(I)    Wuchereria 

(II)  Microsporum 
(III) Haemophilus
(IV) Epidermophyton

  1. I and II

  2. II and III

  3. III and IV

  4. I and IV

  5. II and IV
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ringworm is a contagious fungal infection caused by mould-like parasites that live on the cells in the outer layer of your skin. It can be spread from Human to human. Ringworm often spreads by direct, skin to skin contact with an infected person. It is caused by Haemophilus and Epidermophyton. Hence, Ringworms are caused by Haemophilus and Epidermophyton.] So, the correct answer is 'III and IV'.

Multiple choice bio-chemistry immunology fungal diseases fungal, protozoan and worm diseases useful and harmful microbes

Which of the following diseases is caused by a fungal infection?

  1. Ringworm

  2. Cancer

  3. Filaria

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

  • Ringworm is an infection of the skin caused by a fungal infection. Ring worm is characterised by the ring shaped rashes on the skin, itching, yellowing or decolouration of the affected area. It may also result in hair loss, if it infects the areas covered by hair. It is spread through skin contact with infected person.
  • Filaria is caused by a roundworm Wuchereria bancrofti while Typhoid fever is due to bacterial infection caused by Salmonella Typhi
So, the correct option is 'Ringworm'.

Multiple choice botany root - external morphology root system in plants modifications of root root modifications

Mycorrhizal association controls root affecting pathogens in plants because.

  1. Mychorrhizal fungi colonize the roots and acts as a barrier during infection

  2. Mychorrhizal fungi helps in phosphorus uptake

  3. Mychorrhizal fungi help during stress and shock

  4. Mychorrhizal fungi produce toxins against pathogens
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mycorrhizal fungi form a physical mantle or network around the roots, which acts as a physical barrier against soil-borne pathogens, in addition to aiding in nutrient uptake.

Multiple choice biology the world of microbes medicinal use of microorganisms use of microorganisms in medicine vaccines

Identify a fungus with medicinal importance.

  1. Penicillium

  2. Cercospora

  3. Agaricus

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

Penicillin is a secondary metabolite of certain species of Penicillium and is produced when the growth of the fungus is inhibited by stress. It is not produced during active growth. Production is also limited by feedback in the synthesis pathway of penicillin.

So, the correct option is 'Penicillium'.

Multiple choice botany economically useful plants and entrepreneurial botany horticulture organic farming horticulture and organic farming

In an agriculture field there is a prevalence of the following organism and crop disease which are affection the crop yield badly ________________.

  1. White rust

  2. Leaf and strips rust

  3. Black rot

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

White rust or white blister caused by the oomycete Albugo candida. White rust is an obligate parasite that attacks vegetative and flowering structures of the plants and can cause yellow lesions on the upper surface and white pustules (mainly on the underside) of leaves and can cause malformation of inflorescences. Dispersal and infection are favoured in cool and humid conditions in spring and autumn. Dispersal is mainly done by wind and water. Several species of Albugo can attack Brassicaceae crops and weeds, but Albugo candida is the main species identified in Brassica crops.


So, the correct option is 'White rust'.

Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

An antibiotic yielding fungus amongst the following is

  1. Cladonia

  2. Parmelia

  3. Penicillium

  4. Aspergillus
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Penicillin sometimes abbreviated PCN or pen is a group of antibiotics derived from Penicillium fungi. Penicillin antibiotics were among the first drugs to be effective against many previously serious diseases, such as bacterial infections caused by staphylococci and streptococci. Penicillins are still widely used today, though misuse has now made many types of bacteria resistant.

Thus, the correct answer is option C.

Multiple choice biology micro organisms food production and microorganisms microbial products - food, medicines and industrial products uses of microorganisms

Moulds belong to 

  1. Ascomycota

  2. Zygomycota

  3. Deutromycota

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

(A)Ascomycota is a class commonly known as sac fungi with asexual spore ascus.

(B)Zygomycota is a class of fast-growing fungi with asexual spore conidia.
(C)Deutromycota is a class commonly called fungi Imperfecti where there is no sexual phase.
So, the correct answer is 'All of the above'.