Question

Place the events in the formation of lateral roots in the correct order, starting at the top.

1. Pericycle cells near the outside of xylem arms begin to divide
2. Dividing pericycle cells bulge out into the cortex and endodermis.
3. The new root pushes and crushes the cortex cells.
4. The new root breaks through the epidermis.

Answer 1

The formation of lateral roots involves a series of events starting with pericycle cell division. The dividing pericycle cells bulge out into the cortex and endodermis, the new root breaks through the epidermis, and pushes and crushes the cortex cells.

Step-by-step explanation:

1. Pericycle cells near the outside of xylem arms begin to divide. This is the initial step in the formation of lateral roots. The pericycle cells, located just inside the endodermis, start dividing in response to certain signals.
2. Dividing pericycle cells bulge out into the cortex and endodermis. As the pericycle cells divide, they push and bulge out into the cortex and endodermis layers of the root. This bulging creates a new root primordium.
3. The new root breaks through the epidermis. The new root continues to grow and eventually breaks through the epidermis, the outermost layer of the root, allowing it to emerge and grow outside the main root.
4. The new root pushes and crushes the cortex cells. As the new root grows, it pushes and crushes the cortex cells within the root, creating space for the lateral root to develop.