In the following pairs, where do you get lignin in both the element?

• Tracheid and collenchyma

• Sclerenchyma and sieve tube

• Sclerenchyma and trachea

• Parenchyma and endodermis

One of the characteristic of sieve tube is

• it is a part of phloem

• function is transport of inorganic solutes

• it is dead cell

• sieve plate is not present

63.

Pith is absent in

• protostele

• eustele

• amphiphloic stele

• ectophloic stele

Quiescent centre is found in plants at

• root tip

• cambium

• shoot tip

• leaf tip

Interfascicular cambium is a

• primary meristematic tissue

• primordial meristem

• type of protoderm

• secondary meristematic tissue

Portion of apical meristem that gives xylem tissue is called

• protoxylem

• procambium

• metaxylem

• tracheid

Interfascicular cambium develops from the cells of

• medullary rays

• xylem parenchyma

• endodermis

• pericycle

Lenticels are involved in

• transpiration

• gaseous exchange

• food transport

• photosynthesis

Age of a tree can be estimated by

• its height and girth

• biomass

• number of annual rings

• diameter of its heartwood

Medullary rays are tissues made up of

• phloem parenchyma

• xylem parenchyma

• sieve tube

• sclerenchyma