Biology : Plant Growth and Development

When an ovary develops into a fruit without fertilization it is called

• porogamy

• apospory

• apogamy

• parthenocarpy

GA usually promotes

• sterility in flowers

• maleness in flowers

• femaleness in flowers

• Both (b) and (c)

Ethylene is

• gaseous hormone

• largest hormone

• liquid hormone

• solid hormone

Induction of cell division and delay in senescence is done by

• cytokinins

• auxins

• GA

• Co-A

Which of the following induces and promotes cell division?

• ABA

• Auxin

• Cytokinin

• Gibberellin

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