A rectangular drainage pattern with streams flowing parallel to each other and joining the main stream at right angles is called ________________.
1. Dendritic drainage pattern
2. Trellised drainage pattern
3. Radial drainage pattern
4. Disappearing streams

Hint:
When two sets of structural controls occur at the right angles, a rectangle pattern is formed then the river forms net-like systems and tributaries that flow parallel to each other.

A drainage pattern in which the main streams and their tributaries show several right-angle bends and exhibits parts. It represents streams that split the rocks into rectangular blocks following a prominent fault or joint system.

Complete answer:
Drainage systems are also known as the river systems, and the patterns are formed by the rivers, streams, lakes, and rivers in a particular drainage basin. The Drainage systems are governed by the irregularity of tectonic, the nature of the underlying rock strata, and the land gradient.
The special relationships among the streams, lakes, or rivers are influenced by their erosion and the inequalities of the slope, rock resistances, geological history, and the structure. These are the drainage patterns or arrangements.
A rectangular drainage pattern with streams flowing parallel to each other and joining the main stream at right angles is called a trellised drainage pattern. Singhbhum’s (Chotanagpur Plateau), the old folded mountains have the drainage of trellis pattern.
Therefore the answer is 2. Trellised drainage pattern

Note:
The drainage pattern when it correlates to the topology and geology of the area is described as concordant.

The trellis type of drainage system is the short subsequent streams meet the main streams at the right angles, and the differential erosion with the help of soft rocks paves the way for the tributaries.