Seed Germination Mechanism

What is seed imbibition and why is it important for germination?

• Seed imbibition is the process of seeds absorbing water to initiate germination. It is important for germination because it activates enzymes, softens the seed coat, and provides the necessary conditions for metabolic processes to begin.

• Seed imbibition is the process of seeds releasing water to prevent germination.

• Seed imbibition is the process of seeds absorbing air to initiate germination.

• Seed imbibition is the process of seeds absorbing sunlight to promote germination.

Name the hormone responsible for breaking seed dormancy.

• Cytokinins

• Abscisic acid (ABA)

• Gibberellins

• Ethylene

Explain the process of scarification as a method to break seed dormancy.

• Scarification involves freezing seeds to induce dormancy.

• Scarification helps break seed dormancy by weakening the seed coat, allowing water and gases to penetrate and promote germination.

• Scarification requires exposing seeds to excessive sunlight to promote germination.

• Scarification is a process of drying seeds to break dormancy.

List the stages of seed germination in order.

• Imbibition, Growth of the shoot, Activation of enzymes

• Activation of seeds, Emergence of the shoot, Growth of the radicle

• Growth of the shoot, Emergence of the radicle, Activation of enzymes

• Imbibition, Activation of enzymes, Growth of the radicle, Emergence of the radicle, Growth of the shoot, Emergence of the shoot

What are the basic requirements for seed germination to occur?

• Chemicals, pressure, and sound waves

• Water, proper temperature, oxygen, and light (for some seeds)

• Wind, soil, and nutrients

• Extreme temperatures, darkness, and humidity

How does gibberellin hormone promote seed germination?

• By reducing cell elongation

• By increasing seed dormancy

• By breaking seed dormancy, stimulating hydrolytic enzymes, and enhancing cell elongation.

• By inhibiting hydrolytic enzymes

Discuss the role of water in the seed germination process.

• Water helps in seed germination by softening the seed coat, activating enzymes, and providing a medium for metabolic processes.

• Water delays seed germination by preventing enzyme activation

• Water inhibits seed germination by causing excessive moisture

• Water accelerates seed germination by hardening the seed coat

What is the significance of light in seed germination?

• Light triggers photosynthesis and hormone production in seeds.

• Light inhibits the absorption of nutrients in seeds.

• Light causes seeds to rot instead of germinate.

• Light attracts pests that damage seeds.

Describe the process of stratification in breaking seed dormancy.

• Stratification involves exposing seeds to high temperatures to break dormancy.

• Stratification involves placing seeds in a moist medium at low temperatures for a certain period to simulate winter conditions and break dormancy.

• Stratification requires seeds to be kept in a dry environment to break dormancy.

• Stratification involves planting seeds in deep soil to break dormancy.

Explain the role of abscisic acid in seed dormancy.

• Abscisic acid promotes seed germination by breaking dormancy

• Abscisic acid has no effect on seed dormancy

• Abscisic acid inhibits seed germination and maintains dormancy until conditions are suitable for growth.

• Abscisic acid accelerates seed growth