The material which provides rigidity to cell walls is called a) phospholipids b) lipids c) cellulose

Providing immunity by injecting the body with a weakened form a pathogen is known as

Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte

What is a cordon and where is it found