The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is

• maturing

• elongating

• widening

• widening

In barley stem, vascular bundles are

• open and scattered

• closed and scattered

• open and in a ring

• open and in a ring

Vascular tissue in flowering plants develop from

• phellogen

• plerome

• periblem

• periblem

For a critical study of secondary growth in plants. which one of the following pairs is suitable?

• Sugarcane and sunflower

• Teak and pine

• Deodar and fern

• Deodar and fern

A common structural feature of vessel elements and sieve tube elements is

• thick secondary walls

• pores on lateral walls

• presence of P-protein

• presence of P-protein

26.

Root hairs develop from the region of

• Maturation

• Elongation

• Root cap

• Root cap

Plants which produce characterstic pneumatophores and show vivipary belong to

• Mesophytes

• Halophytes

• Psammophytes

• Psammophytes

The vascular cambium normally gives rise to

• Phelloderm

• Primary phloem

• Secondary xylem

• Secondary xylem

Identify the wrong statement in context of heartwood.

• Organic compounds are deposited in it

• It is highly durable

• It conducts water and minerals efficiently

• It conducts water and minerals efficiently

Casparian strips occur in

• Epidermis

• Pericycle

• Endodermis

• Cortex