Plant growth and development

Which of the following growth regulators can fit either of the groups (promoter and inhibitor) –

• C₂H₄

• ABA

• GA

• IAA

Bolting is –

• Internodal elongation just prior to flowering in beet, cabbage and many plants with rosette habit.

• A type of grafting

• Nodal elongation in certain plants

• None

Which one is false?

• GA₃ is used to speed up the malting process in brewing industry

• Spraying juvenile conifers with GAs hastens the maturity, thus leading to early seed production

• GA₃ is a commercially available gibberellin

• GA₃ cannot increase the length of internode in sugarcane

Two cytokinins are kinetin and Zeatin. What is the difference between the two?

• Kinetin is the active form of zeatin

• Zeatin is the active form of kinetin

• Zeatin is a synthetic cytokinin and kinetin is naturally occuring

• Zeatin is a naturally occuring plant cytokinin, kinetin is not

Cytokinins are formed primarily in which area of the plant?

• Tips of shoot

• Root

• Stem

• Lateral buds and leaves

Natural cytokinins are synthesised in –

• Root apices

• Developing shoot buds

• Young fruits

• All

Kinetin, a modified adenine (purine) was discovered from –

• the autoclaved herring sperm DNA

• Coconut milk

• Corn-Kernel

• Fungus

Which of the following is a potent weedicide ?

• IPA

• TIBA

• BAP

• 2, 4-D

In order to increase the yield of sugarcane crop, which of the following plant growth regulators should be sprayed?

• Cytokinins

• Ethylene

• Auxins

• Gibberellin

Removal of shoot tips is a very useful technique to boost the production of tealeaves. This is because :

• Gibberellins delay senescence of leaves.

• Gibberellins prevent bolting and are inactivated.

• Auxins prevent leaf drop at early stages.

• Effect of auxins is removed and growth of lateral buds is enhanced.