Question

How can we notice a weed is a monocot or a dicot

Answer 1

by lokking to its cotyledons and micropyle

Answer 2

Here are some difference between monocots and dicots. By these, you can notice whether a weed is a monocot or a dicot.

MONOCOT:

1) They have adventitious(fibrous) roots.
2) They have sessle leaf.
3) They have trimerous flowers.
4) They have weak stem.
5) They have parallel venation in leaf.

DICOTS:

1) They have tap root.
2) They have stalked leaf.
3) They have pentamerous flowers.
4) They have strong stem.
5) They have reticulate venation in leaf.

Hope this helps....