Wed. & Thu. is the time for class 8 students. Here i am going to start the chapter Transport of food and minerals in the plants. My dear students ! right down my notes in the copy ( Interleaf ) study it and prepare it with confidence.

NOTES OF BIOLOGY FOR CLASS 8 STUDENTS

Transport :-

Every living organism ( From simple unicellular to complex multicellular ) shows signal of life by performing a lot of vivo reactions in the body. Many useful and excretory materials need to be transport in the body for this purpose. This is called transportation in the body of organisms. 

Transport system in the plant body :-

• Plant vegetation varies from unicellular to multicellular. In unicellular algae like chlamydomonas transportation takes place by simple diffusion process. In complex multi cellular plant body the transportation takes place through well developed Vascular system or Conducting system.
• Vascular system in the plant body is made up of complex permanent tissue called xylem and phloem. 
• Xylem conduct water and mineral in the plant body from root to other parts of plant.
• Phloem perform translocation of soluble prepared food from leaves to all other parts of plant..
• The xylem is made up of four kinds of cells - Xylem vessels (Non living), Xylem tracheids (non living), Xylem fibres ( Non living ) and Xylem parenchyma (living).
• Phloem is made up of following components - Phloem vessels ( Sieve tube ), Sieve plates, Phloem parenchyma and Phloem fibres. Among all these cells the phloem fibres is nonliving rest all are living cells.