Question

Pusa Swarnim a variety of Brassica is resistant to
A.Bacterial blight
B.White rust
C.Curl and black rot
D.Mosaic virus

Answer 1

Hint: Pusa Swarnim is a variety of Brassica which is a genus of mustard family called brassicaceae. They are sometimes referred to as cole crops.

Complete answer:
Let us analyze the options to find out the correct option.
Option A: Bacterial blight is a disease of barley which is caused by bacterial pathogen Xantomonas campestris. Pusa Swarnim is not resistant to this infection. Therefore, this is the incorrect option.

Option B: White rust is a disease in plants which is caused by oomycete Albugo candida and its close relatives. Generally the members of Brassica are susceptible to these diseases. However, Pusa Swarnim is resistant to this infection. White rust causes agricultural losses. The signs and symptoms of white rust include white blisters like growth on the under surface of the leaves, chlorosis on the surface of leaves, swelling of roots and stem of the plants. Therefore, this is the correct option.

Option C: Curl and balck rot is caused by the bacteria Xanthomonas campestris. It is also called black stem, black root or stump rot. Pusa Swarnim is not resistant to this infection. Therefore, this is the incorrect option.

Option D: Mosaic virus is a disease caused by a virus that causes infected plant foliage. Pusa Swarnim is not resistant to this infection. Therefore, this is the incorrect option.

Hence, the correct answer is option (B)

Note: White rust can cause problems in the development of the host like sterility, deformation of flower shape and twisting of plants. This may lead to huge losses to farmers.