Biology : Plant Growth and Development

Plants having little or no secondary growth are

• Grasses

• Deciduous angiosperms

• Cycads

• Conifers

Which of the following is not an auxin?

• IM

• IBA

• Zeatin

• NM

Which of the following properties is shown by cytokinins?

• Delay leaf senescence

• Cause leaf abscission

• Promote seed dormancy

• Promote stornatal closing

Sweet potato is a modified

• Stem

• Adventitious root

• Rhizome

• Tap root

Pneumatophores occur in

• Halophytes

• Free-floating hydrophytes

• Submerged hydrophytes

• Carnivorous plants

Which one correctly describe reproduction and life cycle of fern?

• Spore → Gamete → Prothallus → Sporophyte

• Gamete → Spore → Prothallus → Plant

• Prothallus → Sporophyte → Gamete → Fern

• Sporangia → Spore → Prothallus → Sporophyte → Plant

Genetic dwarfism can be overcome by

• Gibberellin

• Ethylene

• Auxin

• ABA

Hormone inducing fruit ripening is

• Cytokinin

• Ethylene

• Aabscissic acid

• Gibberellic acid

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