Question

A stem has nodes and internodes. Which of the following features helps identify nodes on a stem?
the presence of buds on the nodes
the origin of roots from nodes
the swollen appearance of nodes

Answer 1

I think the third option is the answer.
Hope it helps you !!!

Answer 2

Two options can be correct:

Option B- the origin of roots from nodes  

Option C- the swollen appearance of nodes

 The swollen appearance of nodes on stem is one feature that helps identify nodes on a stem.  

Option B can also be true because nodes are points of attachments for leaves, aerial roost and flowers.