Tag: plant diseases

Questions Related to plant diseases

Pusa Swarnim a variety of Brassica is resistant to

plant diseases keeping diseases away biology

  1. Bacterial blight

  2. White rust

  3. Curl and black rot

  4. Mosaic virus.

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Correct Option: B

Plants protect themselves from fungi by producing.

plant diseases keeping diseases away biology

  1. Protoxins

  2. Phytoalexins

  3. Prolectins

  4. All the above

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Correct Option: D
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

Which of the following is a bacterial plant disease

plant diseases keeping diseases away biology

  1. Tikka disease of Groundnut

  2. Downy mildew of Grapes

  3. Ring rot of Potato

  4. Red rot of Sugarcane.

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Correct Option: C

Symptoms of red rot disease appear over :

plant diseases keeping diseases away biology

  1. Leaf tip

  2. Whole leaf

  3. Mid rib

  4. Leaf margin

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Correct Option: C
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'.

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
plant diseases keeping diseases away biology

  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

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Correct Option: A

Pusa Komal variety of Cow Pea Is resistant to disease

plant diseases keeping diseases away biology

  1. White rust

  2. Leaf curl

  3. Bacterial blight

  4. Hill bunt.

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Correct Option: C

Plants can be made disease resistant through

plant diseases keeping diseases away biology

  1. Colchicine treatment

  2. X-ray treatment

  3. Breeding with wild relatives

  4. Hormone treatment.

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Correct Option: C

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.

plant diseases keeping diseases away biology

  1. Old leaves

  2. Young leaves

  3. Young leaves followed by mature leaves

  4. Mature leaves followed by young leaves

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Correct Option: A
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.

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 ___________________.

plant diseases keeping diseases away biology

  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

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Correct Option: A

Which one of the following statements is not correct?

plant diseases keeping diseases away biology

  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.

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Correct Option: A