Given scientific reason. (1) Modern methods of irrigation help us to use water economically. Why?​

Modern methods of irrigation help us use water economically, thereby conserving water. In addition, such methods help save time and labour. Hence, they are more efficient than traditional methods of irrigation.

In the drip irrigation, we lay plastic pipes in rows near the crops or plants. These pipes have holes in them. The water seeps from these holes drop by drop, hence the name drip irrigation. Drip irrigation is one of the most efficient irrigation methods as it reduces water wastage in agriculture.

i believe you meant to say air rather than hair so the answer is below ")

the dead sea, the lowest place on earth at 430 metres (1,410 ft) below sea level, has a correspondingly high typical atmospheric pressure of 1065 hpa.