Activity Take a glass and will them with water and put onion on it and measures the lenth of root for 3 days what was the lenth of roots in 3 days and cut out root at 5 day what was the leanth of root day 1,2,3 ???
Answers
Answer:
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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 day 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, like the table below:
From the above observations, answer the following questions:
1. Which of the two onions has longer roots?
2. Do the roots continue growing even after we have removed their tips?
3. Why would the roots stop growing in Jar 2?
The roots of the onion in the 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 have been cut. When the root tips are cut, the apical meristem responsible for the increase in length
gets removed.
The growth of plants occurs only in certain specific regions. In the above picture, the roots of onion bulb grow fast at the tip
due to presence of dividing cells of meristematic tissues located only at these points.
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.
Length Day 1 Day 2 Day 3