Plant breeding for disease resistance and insect resistance - class-X

Resistance to jassids in cotton and cereal leaf beetle in wheat is primarily due to morphological characters, such as the presence of hairs (trichomes) on the leaves.

Hairy leaves (trichomes) act as a physical barrier that prevents insects from landing, feeding, or laying eggs, thus providing resistance to pests.

Nectarless cotton varieties are known to be resistant to bollworms because the absence of nectar reduces the food source for the adult moths.

Maize resistance to stem borers is associated with high aspartic acid, low nitrogen, and low sugar content in the plant tissues.

Parbhani Kranti is a well-known variety of Bhindi (okra) developed through mutation breeding specifically for resistance to the Yellow Mosaic Virus. The other options listed are not associated with this specific variety.

competes with humans, domestic animals, or desirable plants for food or An organism should not be considered a pest until it is proven to be one. The economic losses caused by pest damage, if the pest population continued to or component sharing the site usually affect the actions and well-being of many others. So, the correct option is "D" (Pest).

So, the correct option is 'rapeseed mustard'

A.Cotton – Smooth leaved and nectar less cotton varieties do not attract bollworms

B.Sugar cane – Saccharum barberi is crossed with Saccharum officinarum, the newly formed varieity shows the desirable qualities of high yield, thick stems, high sugar and ability to grow.

C.Maize – High aspartic acid, low nitrogen and sugar content in maize leads to resistance to maize stem borers.

D.Wheat – Solid stems lead to non preference by the stem sawfly.

So,
the correct answer is ‘Maize’.

Mutation breeding is the way toward presenting seeds to synthetic concoctions or radiation so as to create freaks with attractive qualities to be reproduced with different cultivars. 

The process of mutation breeding involves inducing mutations artificially through use of chemicals or radiations and selecting plants that have the desirable character as a source in breeding.

In biological control method, birds, insects and other living organisms are deliberately let out in fields to selectively kill pests. This becomes an easy method for protecting crops against selective pests. This is an environment friendly method to control the pests.