growth from the
6. What is diffusion ?
6. Distinguish between rooi pressure and turgor pressure,
7. Write the importance of purgor pressure,
B. What do rools absorb from the soil ?
e. How does an exosmosis differ from an endeamgeis?
10. What is plasmolysis ?
11. Write down the factors which control wanspiration
12. What is a potometer?
13. Define wilting
14. Write one disadvantage of Wanspiration
15. What are hydathodes ?
Answers
Answer:
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Answer:
Explanation:
6.Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. Diffusion happens in liquids and gases because their particles move randomly from place to place. Diffusion is an important process for living things; it is how substances move in and out of cells.
6.Sol: Turgor pressure is the pressure exerted by the cytoplasm on the cell wall. During osmosis, when the cell is placed in a hypotonic solution (solution with less solutes and higher water potential) water moves from solution into the cells. This causes the cytoplasm to build the pressure against the cell wall. This pressure is called as turgor pressure. This pressure is exerted by the protoplast against the cell wall due to the entry of water is called as pressure potential. It is the turgor pressure in the plant cells which helps the plants to be erect. As the cell walls are strong, cells do not rupture but enlarge in size to cause extension in growth. Wall pressure is the pressure applied by the cell wall on the contents of the cell. Wall pressure is opposite to the turgor pressure.
7.Turgor pressure is the force within the cell that pushes the plasma membrane against the cell wall.[1]
It is also called hydrostatic pressure, and defined as the pressure measured by a fluid, measured at a certain point within itself when at equilibrium.[2] Generally, turgor pressure is caused by the osmotic flow of water and occurs in plants, fungi, and bacteria. The phenomenon is also observed in protists that have cell walls.[3] This system is not seen in animal cells, seeing how the absence of a cell wall would cause the cell to lyse when under too much pressure.[4] The pressure exerted by the osmotic flow of water is called turgidity. It is caused by the osmotic flow of water through a selectively permeable membrane. Osmotic flow of water through a semipermeable membrane is when the water travels from an area with a low-solute concentration, to one with a higher-solute concentration. In plants, this entails the water moving from the low concentration solute outside the cell, into the cell's vacuole.[5]
B.Root hair absorbs water from soil through osmosis. Water will be absorbed by root hairs by osmosis as the environment in the soil is hypotonic. This kind of absorption takes place passively. The water can easily move from the region of higher concentration to the low concentration without expenditure of energy. The cell membrane of the root cells acts as a semipermeable membrane. It passes the epidermis, cortex, endodermis, casparian strip and pericycle and protoxylem and metaxylem.