Artificial application of auxins like IAA, IBA and NAA to unpollinated pistils can form

• fruits with much flash

• larger fruits

• sweet fruits

• seedless fruits

Internodal elongation is stimulated by

• auxin

• cytokinin

• gibberellin

• phenol

Flash of light in dark inhibits flnwering in

• SDP

• LDP

• LSDP

• DNP

Plant length is increased by

• apical meristem

• lateral meristem

• dermarogen

• periblem

The mutagenic agent among following is

• ethyl methane

• ethylene

• 2, 4-D

• IAA

Which one of the following is a natural growth inhibitor?

• NAA

• ABA

• IAA

• GA

Which one is a short day plant?

• Brassica campestris

• Raphanus sativus

• Glycine max

• Papaver somniferum

Leaf abscission is caused by

• ABA

• cytokinin

• auxin

• gibberellin

The synthetic hormone used as a weedicide is

• Indole 3-acetic acid

• gibberellic acid

• 2, 4- D 

• Indole butyric acid

First natural cytokinin was discovered by :

• Skoog and Miller

• Letham

• Benson and Calvin

• Thimann and Went