The Eyes of the potato tuber are

• flower buds

• shoot buds

• axillary buds

• axillary buds

In land plants, the guard cells differ from other epidermal cells in having

• mitochondria

• endoplasmic reticulum

• chloroplasts

• chloroplasts

The cork cambium, cork and secondary cortex are collectively called

• Phellogen

• Periderm

• phellem

• phellem

Function of copanion cells is 

• providing energy to sleve elements for active transport

• Providing water to phloem

• loading of sucrose into sieve elements by passive transport

• loading of sucrose into sieve elements by passive transport

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

18.

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