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 test tube mouth was covered using cotton plug as shown.The student kept the plant undisturbed in the lab. 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.
(a).What does this observation explain? * Eosin solution gets stored in the xylem
Water moves through xylem in the plant
Most portion of the plant stem is occupied by xylem
Xylem reacts with eosin and gives colour
If the leaves of the plant in above experiment were coated with vaseline, the studies will reveal the following observations: *
The transverse section of the stem will show the presence of vaseline in xylem vessels
Glycerine gets stored in phloem.
Vaseline block the stomata so transpiration will not occur, hence no transport of water.
The plant will be able to exchange the gases.
2 question pls tell correct answer
Answers
The observation deduced from the above experiment is that water is transported in plants through xylem. Also, if glycerine is applied on the leaf process of tranpiration is hindered due to blockage of stomata.
Explanation:
* Xylem is the part of vascular system of plants which helps in transportation of water throughout the plant.
* So, in the above experiment when plant is placed in the eosin solution it get transferred to plant part through xylem.
* Thus, when we cut the stem in between a pink colour is present in the xylem because it transports the water in plants.
Now, if glycerine is applied on the leaf it will close the stomata which will cause hinderance in the process of transpiration.
* As the transpiration process occurs from stomata present on the leaf surface, closure of stomata cause hinderance in transpiration.
* Also, transpiration helps in process of transportation of water in xylem by creating pressure hence no transpiration means no transportation of water.