what is suitable portion for main course

Water conservation is important despite the fact that large portion of our planet contains water because much of it is not suitable for traditional uses.

in meristem culture we take apical portion of shoot and now cut its tip under microscope and put into it suitable medium to culture it..

No one really knows.

Despite best efforts, how you score on an intelligence test has a big learned portion to it. If you've had a suitable education, you'll do better.

The comparative forms of "suitable" are "more suitable" and "less suitable".

The superlative forms of "suitable" are "most suitable" and "least suitable".