Question

The given diagram represents an experimental set- up to demonstrate a vital process. The jar A and jar B contains onion bulb with root tip touching the water. The root tips of onion in jar B have been cut after 4 days. Now answer the following questions: 1. Which of the two onions has longer roots? Why? 2. Do the roots continue growing in jar B even after the root tips have been removed? Give reasons in support of your answer. 3. What inference can you draw from the above experiment?

Answer 1

Explanation:

1) onion A because the root tip of B has been cut and A continues to grow in the water.

2) No the root will not continue to grow because the growth occurs due to the meristematic tissue which is present in root tip....but as root tip has been cut so it will not grow

3) meristematic tissues present at onion root tip is responsible for growth

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. hope this will help...

Answer 2

Answer:

The onion in jar A has longer roots than that of onion in jar B.

Explanation:

1. The roots of onion in jar A will be longer than the roots of onion in jar B.
2. The roots did not continue to grow in jar B, after the root tips of onion have been removed. Root tips of plants contain apical meristematic tissue. This tissue is responsible for the elongation of length of roots. Therefore, as the tips of onion in jar B is cut, apical meristematic tissue has been removed. After that, there will be no growth in the roots of onion in jar B.
3. This experiments shows that the growth of plant occurs at the specific area of plant. In the jar A the tips of the onion are uncut, therefore, the growth of the roots did not stop. In the jar B the root tips of onion were cut which cause the removal of apical meristem form from the roots tips. Therefore, the growth of roots of onion in jar B stopped.