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answer 1
carbon dioxide move across cell membranes via simple diffusion, a process that requires no energy input and is driven by differences in concentration on either side of the cell membrane.
answer 2
Plasma membrane is also known as semi permeable as it allows certain molecules to pass through it while stopping others. It protects intracellular organelles from the outside environment. It selectively allows the molecules to move in and out of the cell.
Answer:
1. The substances like CO₂ and H₂O move in and out of a cell by diffusion i.e from the region of high concentration to low concentration. When the concentration outside the cell becomes low and it is high inside the cell, they move out. When the concentration of CO₂ and water is higher in external environment than that inside of the cell, carbon dioxide and water move inside the cell.
2. The plasma membrane is called semi permeable membrane because the plasma membrane is also called as semi-permeable membrane as it allows several molecules to pass through it by stopping others. Plasma membrane is called semipermeable membrane because it allow movement of few selected substances only through it. Its main function is that it allows osmosis.
The functions of it are as follows.
- It allows only a certain molecules to pass through it.
- The plasma membrane forms a barrier between the cell organelles from the outside environment.
- It facilitates communication and signalling between the cells.
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