Question

168. Which of the following are not disease resistant
varieties :-
(1) Pusa subhra
(2) Pusa swani
(4) Pusa sadabahar
(3) Pusa komal​

Answer 1

Answer:

pusa komal hai answer ok

Answer 2

Answer:

(2) Pusa sawani is not a disease-resistant variety.

Explanation:

• Resistant varieties are an important agricultural disease management practice to include in a disease management program.

• Different varieties have been bred with resistance to many important diseases caused by different types of disease-causing pathogens such as fungi, oomycetes, bacteria, viruses, nematodes etc. but unfortunately not all.  

• Breeding is carried out by conventional breeding techniques (described earlier) or by mutation breeding.

• The conventional method of breeding for disease resistance involves hybridisation and selection.
• The steps are essentially identical to those for breeding for any other agronomic characters such as high yield.

• The various sequential steps are screening germplasm for resistance sources, hybridisation of selected parents, selection and evaluation of the hybrids and testing and release of new varieties.

• Some crop varieties are bred by hybridisation and selection, for disease resistance to fungi, bacteria and viral diseases are released.

• (1) Pusa Shubhra is the disease-resistant variety of Cauliflower. It shows resistance against Black rot and Curl blight black rot disease.

• (4) Pusa Sadabahar is the disease-resistant variety of Chili against the Chilly mosaic virus, Tobacco mosaic virus and leaf curl.

• (3) Pusa Komal is the disease-resistant variety of cowpea, which shows resistance against Bacterial disease- Bacterial blight.

• (2) Pusa sawani is an insect pest-resistant variety of Okra (Bhindi) that is resistant to insect pests such as Shoot and Fruit borer.

• Since out of the given disease-resistant varieties, (2) Pusa swani is the pest-resistant variety.

Thus, Option (2) Pusa swani is the most correct answer.

SPJ2