The hormone, which prevents abscission is

• IBA

• ABA

• NAA

• Cytokinin

Equipment used for the measurement of growth in plants is known as

• respirometer

• auxanometer

• atmometer

• potometer

Phototropic curvature in Avena coleoptile is the result of uneven distribution of

• auxin

• starch

• gibberellins

• phytochrome

Study of bakanae disease of rice led to discovery of

• auxins

• bakery rice

• Both (a) and (b)

• gibberellins

Which of the following induces and promotes cell division?

• ABA

• Auxin

• Cytokinin

• Gibberellin

Ethylene is

• gaseous hormone

• largest hormone

• liquid hormone

• solid hormone

The pH of protolasm is

• 6.0

• 6.8

• 7.8

• 8.2

GA usually promotes

• sterility in flowers

• maleness in flowers

• femaleness in flowers

• Both (b) and (c)

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

• porogamy

• apospory

• apogamy

• parthenocarpy

Induction of cell division and delay in senescence is done by

• cytokinins

• auxins

• GA

• Co-A