Some vascular bundles are described as open because these

• are surrounded by pericycle but no endodermis

• are capable of producing secondary xylem and phloem

• Possess conjunctive tissue between xylem and phloem

• Possess conjunctive tissue between xylem and phloem

Which one of the following is not a lateral meristem?

• Intrafascicular cambium

• interfascicular cambium

• Phellogen

• Phellogen

Heartwood differs from sapwood in 

• Presence of rays and fibres

• the absence of vessels and parenchyma

• having dead and non-conducting elements

• having dead and non-conducting elements

Transport of food material in higher plants takes place through

• companion cells

• transfusion tissue

• tracheids

• tracheids

Black (stem) rust of wheat is caused by

• Alternaria solani

• Ustilago nuda

• Puccinia graminis

• Puccinia graminis

Aestivation of petals in the flower of cotton is correctly shown in

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

60.

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