Question

Put the onion bulb on the mouth of the bottle to continue the experiment.observe the growth of the cut root with that of other roots and write down your findings​

Answer 1

hope this will help you

Answer 2

When the root tips of an onion bulb are cut, the cells in the root tip die, and hence, growth stops because the tip of the roots contains the meristematic tissue which is responsible for growth.

Meristematic tissues are at a constant state of division.

Explanation:

• Takes two glass jars and fill them with water.

• Now, take two onion bulbs and place one on each jar, as shown in Figure.

• Observe the growth of roots in both the bulbs for a few days.

• Measure the length of roots on days 1, 2, and 3.

On day 4, cut the root tips of the onion bulb in jar 2 by about 1cm. After this, observe  the growth of roots in both the jars and measure their lengths each day for five more  days and record the observations in tables

1. The roots of the onion in jar 1 would be longer whereas the growth of roots of onion in jar 2 stop after the root tips of  the onion bulb in jar 2 has been cut. When the root tips are cut, the apical meristem responsible for the increase in length  gets removed.
2. The growth of plants occurs only in certain specific regions. In the above picture, the roots of an onion bulb grow fast at the tip  due to the presence of dividing cells of meristematic tissues located only at these points.
3. New cells produced by meristem are initially like those of the cells of meristem itself, but as they grow and mature, their  characteristics slowly change and they become differentiated as components of other tissues. Apical meristem is present  at the growing tips of stems and roots and increases the length of the stem and the root