Q. 84.3( 10 Votes )

(a) With the help of well-labelled diagrams, describe the process of plasmolysis in plants, giving appropriate examples.  (b) Explain what will happen to a plant cell if it is kept in a solution having higher water potential. 

Answer :

(a) Plasmolysis is process, which takes when a cell is placed in a hypertonic solution. During this process water moves out of the cell and the cell membrane of a plant cell shrinks away from its cell wall. When water moves out; it is first lost from the cytoplasm and then from the vacuole. The water when drawn out of the cell through diffusion into the extracellular (outside cell) fluid causes the protoplast to shrink away from the walls. The cell is said to be plasmolysed. The movement of water occurred across the membrane moving from an area of high water potential (i.e., the cell) to an area of lower water potential outside the cell. Eg. When grapes are immersed in sugar solution for few days we can see that the solution inside the grapes has moved out to the external medium making the grapes to shrink. (b) The process of plasmolysis is usually reversible when the plant cell is placed in solution, which has higher water potential. The water from the external solution enters into the plant cell causing the cytoplasm to build up a pressure against the cell wall called turgor pressure. Eg. When dry raisins are placed in pure water for few hours we can see that the water diffuses into the raisins making the cell turgid.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Diffusion & Osmosis | Interactive QuizDiffusion & Osmosis | Interactive QuizDiffusion & Osmosis | Interactive Quiz45 mins
Interactive Quiz on Transport of Phloem SapInteractive Quiz on Transport of Phloem SapInteractive Quiz on Transport of Phloem Sap51 mins
Lets understand the transport across plasma membraneLets understand the transport across plasma membraneLets understand the transport across plasma membrane53 mins
Interactive Quiz on Transport of water & mineralsInteractive Quiz on Transport of water & mineralsInteractive Quiz on Transport of water & minerals52 mins
Mechanism of vertical transport of water in plants from roots to leavesMechanism of vertical transport of water in plants from roots to leavesMechanism of vertical transport of water in plants from roots to leaves53 mins
Interactive Quiz - Active transportInteractive Quiz - Active transportInteractive Quiz - Active transport44 mins
Detailed Explaination of Photosynthesis in 50 MinutesDetailed Explaination of Photosynthesis in 50 MinutesDetailed Explaination of Photosynthesis in 50 Minutes57 mins
C3 and C4 cycle - Getting NEET ReadyC3 and C4 cycle - Getting NEET ReadyC3 and C4 cycle - Getting NEET Ready62 mins
Quiz on respiration in plantsQuiz on respiration in plantsQuiz on respiration in plants45 mins
Quiz on photosynthesis of flowering plantsQuiz on photosynthesis of flowering plantsQuiz on photosynthesis of flowering plants45 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :