any specific reason why this valley was chosen for growing crops?
Because of well developed irrigation system by the  Indus Valley Civilization
History of agriculture
 Irrigation was developed in the Indus Valley Civilization by around 4500 BC.
one of the developments of the agricultural societies was the UNANSWERABLE what are the archaeological pieces of evidence to prove that agricultural activities happened in ancient times? Wild grains were collected and eaten from at least 105,000 years ago, starting from around 9500 BC, the eight Neolithic founder crops which were cultivated in the Levant which place in egypt was favorable for farming activities to be carried out? Places near Nile River what crops were cultivated in this country in ancient times? Wheat and barley, alongside industrial crops such as flax and papyrus what crops were cultivated in the indus valley? Barley and wheat
wiki:21099181
History of agriculture [SEP] Indus Valley
Jujube was domesticated in the Indian subcontinent by 9000 BC. Barley and wheat cultivation – along with the domestication of cattle, primarily sheep and goats – followed in Mehrgarh culture by 8000–6000 BC. This period also saw the first domestication of the elephant. Pastoral farming in India included threshing, planting crops in rows – either of two or of six – and storing grain in granaries. Cotton was cultivated by the 5th–4th millennium BC. By the 5th millennium BC, agricultural communities became widespread in Kashmir. Irrigation was developed in the Indus Valley Civilization by around 4500 BC. The size and prosperity of the Indus civilization grew as a result of this innovation, leading to more thoroughly planned settlements which used drainage and sewers.