In some organisms, karyokinesis is not followed by cytokinesis as a result of which, the multinucleate condition arises leading to the formation of the syncytium. The perfect example of this is

• The appearance of a furrow in the cell membrane

• Liquid endosperm in coconut

• Sexual reproduction

• Fertilization

Which one of the following pair is not correctly matched?

• Almond-Drupe

• Brinjal-Berry

• Guava-Pepo

• Loquat-Pome

Compare the statements I and II and choose the correct option.

Statement (I) Auxin promotes apical dominance by suppressing the activity of lateral buds.

Statement (II) In moriculture, periodic pruning of shoot tips is done to make mulberry plants bushy.

Choose the correct options

•  I is false, but II is true

• II is false, but I is true

• Both I and II are true

• Both I and II are false

The quiescent centre in root meristem serves as a

• Site for storage of food, which is utilised during maturation

• Reservoir of growth hormones

• Reserve for replenishment of damaged cells of the meristem

• Region for absorption of water

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

• Abscisic acid - Stomatal closure

• Gibberellic acid - Leaf fall

• Cytokinin -  Cell division

• IAA - Cell wall elongation

In callus culture, roots can be induced by the supply of

• auxin

• cytokinin

• gibberelin

• ethylene

The bioassay of auxin is

• avena curvature test

• callus formation

• culture of fungus

• seed dormancy

Induction of flowering by low temperature treatment is

• vernalization

• cryobiology

• photoperiodism

• prunning

The bioassay of auxin is

• avena curvature test

• callus formation

• culture of fungus

• seed dormancy

170.

Which one of the following is a natural growth inhibitor?

• NAA

• ABA

• IAA

• GA