Question

A student performs an experiment using a balsam plant with intact stem, leaves, roots and flowers. The plant was kept in a test tube containing eosin solution (a pink colour dye). The mouth of the test tube was covered using cotton plug as shown. The student kept the plant undisturbed in the laboratory. After 2-3 hours, a transverse section of stem was obtained using sharp scissors and studied under microscope. The studies reveal the presence of pink colour in the vessels of xylem. What does this observation explain

Answer 1

Answer:

Objective - Experiment to show a movement of mineral in xylem.

Requirement: Balsam plant, Beaker, Eosine solution (red dye forms from the action of bromine) and stand.

Procedure:

The shoot of Balsam plant which is leafy is placed in an Eosine solution.

After some time it is observed that the vein of leaves become red and shoot has red streaks.

Transverse section is cut and stained and found that it is xylem tissues.

This shows that the water is translocated in xylem tracheids and vessels.

Rest of the tissues remain unstained.

Conclusion:- From the above experiment, it is proved that xylem tissues are responsible for the translocation of water.Image result for who proved that water is conducted by xylem

Explanation:

Answer 2

The presence of pink colour in the vessels of xylem explains that xylem tissue helps in the transport of water and minerals to different parts of the plant.

• Xylem is one of the two types of vascular tissues found in vascular plants. Xylem tissue is made up of four elements that are involved in the transport of mineral salts and absorbed water from roots to different plant parts such as leaves and stems.
• The presence of pink colour in the xylem vessels of the balsam plant shows that the water and minerals are transported to different plant parts through xylem vessels.