Biology : Plant Growth and Development

'Foolish seedling' disease of rice led to the discovery of

• GA

• ABA

• 2, 4-D

• 2, 4-D

Which one of the following pairs, is not correctly matched?

• Abscisic acid -  Stomatal closure

• Gibberellic acid - Leaf fall

• Cytokinin - Cell division

• Cytokinin - Cell division

Pineapple (ananas) fruit develops from

• a unilocular polycarpellary flower 

• a multipistillate syncarpous flower

• a cluster of compactly borne flowers on a common axis

• a cluster of compactly borne flowers on a common axis

Fruit and leaf drop at early stages can be prevented by the application of

• Cytokinins

• Ethylene

• Auxins

• Auxins

The Golgi complex participates in

• Fatty acid breakdown

• Formation of secretory vesicles

• Activation of amino acid

• Respiration in bacteria

Pneumatophores occur in

• Halophytes

• Free-floating hydrophytes

• Submerged hydrophytes

• Carnivorous plants

Plants having little or no secondary growth are

• Grasses

• Deciduous angiosperms

• Cycads

• Conifers

Sweet potato is a modified

• Stem

• Adventitious root

• Rhizome

• Tap root

Which one of the following generally acts as an antagonist to gibberellins?

• Zeatin

• Ethylene

• ABA

• IAA

Phellogen and phellem respectively denote

• Cork and cork cambium

• Cork cambium and cork

• Secondary cortex and cork

• Cork and secondary cortex