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

Which of the following diseases are caused by fungal pathogens in barley? P. Kernel blight Q. Anthracnose R. Dwarf bunt S. Leaf rust T. Basal glume rot

  1. P and Q

  2. Q and R

  3. R and S

  4. P, R and T

  5. Q, R and S
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

In apple, kernel blight disease is caused by bacteria- Pseudomonas syringae pv. syringae and basal glume rot is caused by bacteria-Pseudomonas syringae pv. atrofaciens. Anthracnose, dwarf bunt and leaf rust are caused by fungal pathogens-Collectotrichum cereale, Tilletia controversa and Puccinia hordei respectively, in apple.

Multiple choice

Which of the following statements is/are incorrect? P. Bunchy top disease of banana is caused by Pyricularia grisea. Q. Pseudomonas solanacearum causes Pseudostem heart rot disease in banana. R. Rhizome rot disease of banana is caused by Erwinia carotovora.

  1. Only P

  2. Only Q

  3. Only R

  4. P and Q

  5. Q and R
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

P. Bunchy top disease of banana is caused by Banana bunchy top virus (BBTV). Pyricularia grisea fungus causes Pitting disease in banana. Q. Pseudostem heart rot disease of banana is caused by Fusarium moniliforme. Pseudomonas solanacearum causes Bugtok disease in banana. R. Rhizome rot disease of banana is caused by Erwinia sp. like- E. carotovora, E. chrysanthemi. Hence, P and Q both the statements are false.

Multiple choice

Directions: Choose the appropriate answer from the options given below:

The microbes that retard the growth of pathogenic germs in milk is ____?

  1. Lacto bacilli

  2. Mycobacterium bacilli

  3. Pox bacilli

  4. Candida Albicans

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

Lactobacilli are beneficial bacteria that naturally occur in milk and produce lactic acid, which inhibits the growth of harmful pathogenic bacteria. Mycobacterium causes tuberculosis, pox bacilli cause smallpox, and Candida Albicans is a yeast fungus.

Multiple choice

Most fungi can not make their own food due to lack of ______.

  1. clear nucleus

  2. pigments

  3. chlorophyll

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

Fungi lack chlorophyll, the pigment essential for photosynthesis. This is why they cannot produce their own food through photosynthesis like plants and must obtain nutrients from external sources as heterotrophs. Presence of a clear nucleus and pigments (other than chlorophyll) are not the limiting factors.

Multiple choice

Which of the following is an infection of the prostate gland in human beings?

  1. Combined periodontic-endodontic lesions

  2. Actinomycosis

  3. Acute prostatitis

  4. Annual ryegrass toxicity
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Acute prostatitis is a serious bacterial infection of the prostate gland. This infection is a medical emergency. It should be distinguished from other forms of prostatitis such as chronic bacterial prostatitis and chronic pelvic pain syndrome (CPPS).

Multiple choice

Which among the following is an air borne fungal disease?

  1. Coccidioidomycosis

  2. Histoplasmosis

  3. Blastomycosis

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

Blastomycosis is caused by the fungus Blastomycoses dermatitidis. It grows in soil as a mold producing conidia that infects humans by the airborne route. Along with common mild respiratory infections, skin lesions can also appear. The fungus grows as a budding yeast in human tissues.