Xylem is helpful in (a)  

The parenchyma that is present in tubers and rhizomes

(a)  

(a)   forms the bulk of the plant body

Stomata are enclosed by two (a)   cells

Blood is one type of (a)   tissue

The fluid matrix of the blood is called (a)  

Universal recipients are (a)   blood group

Graveyard of RBC (a)  

Blood groups are discovered by (a)