Eustele is present in

Amphiphloic $(bicollateral)$ condition of stele means that

Below is a list of plant fibres. From which part of the plant these are obtained ?

$(a)$ Coir   $(b)$ Hemp    $(c)$ Cotton    $(d)$ Jute

Age of a tree can be estimated by :

'Protoderm' and 'procambium' terms were coined by

Assertion : In stem, pericycle take active part in secondary growth.
Reason : In dicots, pericycle has the capacity to produce lateral roots