____ play a vital role in exchange of gases and water vapour.

In which of the following leaf possesses dumbbell shaped guard cell’?

Which of the following is NOT a characteristic of spring wood?

Periderm consists of

Which of the following is essential for secondary growth?

Vascular bundles of dicot root are

In which of the following characters, a monocot root differs from dicot root?

Which of the following plant shows isobilateral leaves?

Secondary growth does not occur in

Stele of a dicot stem consists of all the given below, EXCEPT