Tag: plant diseases

Quizzes (1) Questions (52)

Questions Related to plant diseases

Multiple choice plant diseases keeping diseases away biology

Pusa Swarnim a variety of Brassica is resistant to

  1. Bacterial blight

  2. White rust

  3. Curl and black rot

  4. Mosaic virus.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pusa Swarnim is a biofortified and disease-resistant variety of Brassica (mustard) specifically developed for resistance against White rust.

Multiple choice plant diseases keeping diseases away biology

Plants protect themselves from fungi by producing.

  1. Protoxins

  2. Phytoalexins

  3. Prolectins

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

Protoxins-precursor of toxins.

Phytoalexins-a substance produced by plant tissues in response to contact with parasite.
Prolectins-precursor of plant lectins.
All the above can be used by plants for protection from fungi.
Correct answer-D

Multiple choice plant diseases keeping diseases away biology

Which of the following is a bacterial plant disease

  1. Tikka disease of Groundnut

  2. Downy mildew of Grapes

  3. Ring rot of Potato

  4. Red rot of Sugarcane.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ring rot of potato is caused by the bacterium Clavibacter michiganensis subsp. sepedonicus. The other options listed are fungal diseases.

Multiple choice plant diseases keeping diseases away biology

Symptoms of red rot disease appear over :

  1. Leaf tip

  2. Whole leaf

  3. Mid rib

  4. Leaf margin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The red rot of sugar cane is caused by a fungus glomurella tucumensis. Infected canes, either singly or in clumps, show a sudden orange to yellow discoloration and later the leaves gradually dry. Symptoms include Brown or reddish brown stripes appear externally at nodal region, minute red spots on the upper surface of the midrib in both the directions.

So, the correct answer is 'Mid rib'.
Multiple choice plant diseases keeping diseases away biology

Match List I (Disease) with List II (Causal Organism) and select the correct answer using the code given below the lists:

List I List II
A. Blast disease of rice 1. Ustilago nuda
B. Loose smut of wheat 2. Xanthomonas malvacearum 
C. Black arm of cotton 3. Ustilago scitaminae
D. Whip smut of sugarcane 4. Pyricularia oryzae

  1. A-4, B-1, C-2, D-3

  2. A-3, B-4, C-1, D-2

  3. A-4, B-2, C-1. D-3

  4. A-3, B-1, C-4, D-2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Blast disease of rice is caused by Pyricularia oryzae (A-4). Loose smut of wheat is caused by Ustilago nuda (B-1). Black arm of cotton is caused by Xanthomonas malvacearum (C-2). Whip smut of sugarcane is caused by Ustilago scitaminae (D-3).

Multiple choice plant diseases keeping diseases away biology

Pusa Komal variety of Cow Pea Is resistant to disease

  1. White rust

  2. Leaf curl

  3. Bacterial blight

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

Pusa Komal is a well-known variety of cowpea bred for resistance to bacterial blight.

Multiple choice plant diseases keeping diseases away biology

Plants can be made disease resistant through

  1. Colchicine treatment

  2. X-ray treatment

  3. Breeding with wild relatives

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

Breeding with wild relatives is a traditional and effective method to introduce disease-resistance genes into cultivated crop varieties.

Multiple choice plant diseases keeping diseases away biology

On the basis of symptoms of chlorosis in leaves a student inferred that this was due to deficiency of nitrogen. This inference could be correct only if we assume that yellowing of leaves appeared first in.

  1. Old leaves

  2. Young leaves

  3. Young leaves followed by mature leaves

  4. Mature leaves followed by young leaves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • On the basis of the symptoms of chlorosis in the leaves, a student inferred that this was due to the deficiency of nitrogen. 
  • This may be correct inference only if yellowing of leaves appeared first in young leaves then in old leaves. But Chlorosis is the main symptom of nitrogen deficiency. 
  • Therefore, the leaves gradually become pale or yellow. These will first appear in old leaves and then in young leaves.
  • The correct option is A.

Multiple choice plant diseases keeping diseases away biology

An Albugo caused disease in which pustules on the surface of leaves, stem inflorescence and floral parts along with various type of deformities of which, hypertrophy is most pronounced, are the characteristic symptoms of ___________________.

  1. Yellow stripe rust of wheat

  2. White rust of mustard

  3. Yellow ear rot and ear cockle of wheat

  4. Udbatta disease of rice
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice plant diseases keeping diseases away biology

Which one of the following statements is not correct?

  1. The bunt of rice is found only in southern India

  2. The pathogen of the stem rot of rice belongs to Deuteromycetes.

  3. The blast disease of rice affects the crop in all stages

  4. In the brown spot disease of rice all parts of the plant are infected exept roots.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The bunt of rice is not restricted to southern India; it is found in various rice-growing regions. The other statements are generally accepted facts in plant pathology.