Select the correct combination of mathematical signs

Which of the following scientists are credited with the discovery and understanding of the excretory role of Malpighian tubules in insects?

If there is provision for only one irrigation, then at which stage in wheat the farmer should irrigate the crop? 

Reserpine, a drug is extracted from 

According to Tuckman's theory, the end phase of group development stage is called as ....................................?

A vertical marketing system is:

APEDA is mandated with the responsibility of export promotion and development of  which of the following scheduled products?

In which economic growth model is the transition from stagnation to self-sustained growth emphasized as a central feature for underdeveloped economies?

Which of the following herbicides is most widely applied for selective post-emergence control of broadleaf weeds in wheat cultivation?

The shortest phase of mitosis cell division is 

Sand drown disease in tobacco is caused by deficiency of