Question

In an agricultural field there is a prevalence of the following organisms and crop diseases which are affecting the crop yield badly:
(a) White rust
(b) Leaf and stripe rust
(c) Black rot
(d) Jussids

Recommend the varieties of crops the farmers should grow to get rid of the existing problem and thus improve the crop yiel.  (2) 

CBSE Class XII Biology Question Paper 2017

Answer 1

For white rust it is Pusa swarnim variety of brassica  should be used .

Leaf and stripe rust -Himgiri variety of wheat

Black rot -Pusa shubhra  variety of cauliflower
Jassids -Pusa sem2  variety of flatbean
Hope it helps u.........