Question

How do substances like CO2 and water move in and out of the cell? Discuss.

NCERT Class IX
Sciences - Main Course Book

Chapter 5. The Fundamental Unit of Life

Answer 1

 Substances like carbon dioxide and water can move into and out of cells via osmosis and diffusion.

Diffusion is the net movement of molecules from an area of high concentration to an area of low concentration. This occurs in the lungs, between the alveoli and their surrounding capillaries. When we breathe in, oxygen fills the alveoli. They have a higher concentration of oxygen than the surrounding capillaries, thus oxygen diffuses into the capillaries. Carbon dioxide diffuses out of the capillaries and into the alveoli, in the same way.

Osmosis is the net movement of water from an area of high water potential to an area of low water potential across a semipermeable membrane. An example of osmosis is the movement of water into a root hair cell, which has a higher ion concentration than the surrounding soil water. Water diffuses across the cell membrane via channel proteins (e.g. aquaporin), which are embedded in the membrane.    

Answer 2

Answer:

Substances like co2 accumulates in high quantity inside the cell than outside of the cell .so by the process of diffusion co2 moves from a region of high concentration to a region of low water concentreation.

Water moves in and out of the cell that is from the region of high water concentration to a region of low water concentration by the process of osmosis.the movement of water in and out of the cell also depend upon the solution whether high concentrated or not i.e. hypertonic, hypotonic or isotonic