Identify the odd one among the following and justify that.
(b) Polythene; Egg membrane; Cell membrane; Onion peel

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Solution

Answer:- The odd one out is Polythene.

Polyethylene is not a semipermeable membrane while egg, cell, and onion peel have a living thin membrane that is semipermeable.

Semi permeable also known as selective permeable membrane that allows certain materials into and out of the cell.

Polyethylene is a thermoplastic polymer, and it is the most popular plastic in the world.

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Q. Identify the large lightly stained region of cell enclosed by cell membrane, when we observe the temporary mounts of both onion peel and human cheek cell.

Q. On observing the onion peel under the microscope which set of structures can be seen clearly:
1)nucleus,cell membrane,chromosomes,vacuole
2)cell wall,cell membrane,nucleus,cytoplasm

Q. Arrange the steps correctly to visualise an onion cell. [2 marks]

A. Stain the membrane with safranin and wash it with distilled water.
B. Peel the onion membrane from the inner layer of an onion flesh.
C. Remove excess liquid and place the cell under a microscope.
D. Place the membrane on a glass slide and cover it with a coverslip.

IN THE ACTIVITY OF ONION PEEL (WHICH CONTAINS PLANT CELLS) IT IS GIVEN THAT THE CELL IS SURROUNDED BY PLASMA MEMBRANE ,BUT AFTER A FEW LINES IT IS WRITTEN THAT "In plant cells, the outermost covering also constitutes the cell wall, beneath which the plasma membrane lies.".

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Q. Cell membrane or plasma membrane is described as a selectively permeable membrane. Which of the following statements justify the given fact?

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Identify the odd one among the following and justify that. (b) Polythene; Egg membrane; Cell membrane; Onion peel

Identify the odd one among the following and justify that.
(b) Polythene; Egg membrane; Cell membrane; Onion peel