The network of channels through which water flows is called a ___ system.

Drainage

True or False: A watershed is larger in area compared to a drainage basin.

False. A watershed is smaller in area than a drainage basin.

The drainage pattern resembling the branches of a tree is known as ___ pattern.

Dendritic

Fill in the blank: Areas drained by a river and its tributaries are called ___ basins.

Drainage

True or False: The Arabian Sea drainage area consists of 23 percent of the total drainage area in India.

True

Define the term 'catchment area' in the context of a river.

A catchment area is the specific area from which a river collects water, including its tributaries.

Fill in the blank: The drainage basins of India are classified into three categories based on the size of the watershed: major, medium, and ___ basins.

Minor

The Himalayan drainage system primarily consists of perennial rivers due to their dependence on ___ and ___.

Melting of snow and precipitation

True or False: The Ganga, Indus, and Brahmaputra are considered non-perennial rivers in the Himalayan drainage system.

False. These rivers are perennial.

The evolution of the Himalayan drainage system is believed to have originated from a river known as ___ during the Miocene period.

Shiwalik or Indo-Brahma

What are the three main drainage systems that evolved from the Indo-Brahma river?

The Brahmaputra and its tributaries, the Ganga and its tributaries, and the Indus and its tributaries.

The Indus river system is one of the largest river basins in the world, covering an area of approximately ___ sq. km.

1,165,000 sq. km

The Brahmaputra River emerges from the Chemayungdung glacier and is known as ___ after it carves a gorge in the Himalayas.

Siang or Dihang

What are the primary reasons for the Brahmaputra's susceptibility to flooding and bank erosion?

The Brahmaputra is susceptible to flooding and bank erosion due to its large tributaries bringing significant sediment loads from heavy rainfall in its catchment area.

Fill in the blank: The Ganga River finally discharges into the ___ near the Sagar Island.

Bay of Bengal

True or False: The Indus River system includes tributaries such as the Shyok, Gilgit, and Yamuna.

False - The Indus system does not include the Yamuna; it includes tributaries like Shyok, Gilgit, Zanskar, and others.

The Ganga basin covers an area of approximately ___ sq. km in India.

860,000 sq. km

Fill in the blank: The Narmada and the Tapi flow through ____ valleys.

Rift