Water hyacinth (Eichhornia crassipes) is referred to as the 'Terror of Bengal'.

True breeding line is one that, having undergone continuous self-pollination, shows the stable trait inheritance and expression for several generations.

Natural killer in the blood and macrophages in the tissues are two types of cells that act as 'cellular barriers' to provide innate immunity in humans.

Plant cells are considered suitable for the gene guns to introduce an alien DNA.

Stratification is the vertical distribution of different species occupying different levels. Stratification in the forest is represented by

i) Trees occupying the top layer

ii) Shrubs occupy the second layer. 

iii) Herbs and grasses the bottom most layers.