Improve your learning 1 The structure which controls the entry and exit of the materials through the ollas (ASI) (a) Cell wall (b) Cell membrane (c) Both (d) None of them 2. Fill in the blanks (ASI) (a) The smell of flowers reaches us through the process of (b) The MIC gas of Bhopal tragedy was spread throughout the city through the process of (c) Water enters the potato osmometer due to a process called (d) The fresh grape wrinkles, if kept in salt water because of 3. What do you mean by permeability of membrane? Explain with table example. (ASD) 4. If the dried vegetables are kept in water they become fresh What the reason? (ASD 5. Name the process by which we can get fresh water from sex ST 6 What will happen to a marine fishif kept in fresh water quam Support your answer with reasons. (AS 2)
Answers
The structure which controls the entry and exit of the materials through the ollas (ASI) (a) Cell wall (b) Cell membrane (c) Both (d) None of them
Answer: Cell membrane
Fill in the blanks (ASI)
(a)The smell of flowers reaches us through the process of diffusion of molecules.
(b) The MIC gas of Bhopal tragedy was spread throughout the city through the process of Diffusion.
(c) Water enters the potato osmometer due to a process called Osmosis
(d) The fresh grape wrinkles, if kept in salt water because of Osmosis (endo-osmosis)
3. What do you mean by permeability of membrane?
ans - The permeability of a membrane is the property of membrane by virtue of which it allows only selective substance to pass through it. The selection is based on various factors like size, charge, solubility and saturation.
4. If the dried vegetables are kept in water they become fresh What the reason?
ans - Dried vegetables become fresh when kept in water because of the process of osmosis. Water enter the vegetables through the process of osmosis (endo- osmosis) and move in the the cell of vegetable due to which the vegetables appear fresh .
5. Name the process by which we can get fresh water from sea * ST
ans - The process is called desalination, and it is being used more and more around the world to provide people with needed freshwater.
6 . What will happen to a marine fishif kept in fresh water quam Support your answer with reasons.
ans - If a marine fish is placed in a freshwater aquarium, fish would not be able to survive because fishes are adapted to sea water, fishes body are hypertonic but when water moves to an aquarium it becomes hypotonic. They are unable to regulate the metabolic process in the changed environment and they die.