The Science of Seed Dormancy and Germination

The video explains seed dormancy, a condition where seeds do not germinate despite favorable conditions. It covers causes like impermeable and hard seed coats, and chemical inhibitors like abscisic acid. The video also discusses how seeds overcome dormancy through environmental changes such as rainfall, forest fires, and temperature shifts. It highlights the role of light and depth in germination and the importance of seed dispersal through animal digestion.

What is one reason a seed might not germinate even in perfect conditions?

• The seed is too old.

• The seed coat is impermeable.

• The soil is too rich.

• The seed is too large.

How can a forest fire benefit seed germination?

• By providing nutrients to the soil.

• By increasing the oxygen level.

• By making the seed coat permeable.

• By reducing the number of predators.

Why might seeds not germinate immediately after a small amount of rainfall in a desert?

• The soil is too sandy.

• The temperature is too high.

• The rainfall is insufficient to wash away inhibitors.

• The seeds are too deep in the soil.

What seasonal change helps break seed dormancy?

• Decreased sunlight.

• Prolonged cold conditions.

• Increased humidity.

• Sudden temperature drop.

How does light exposure affect seed germination?

• It increases the soil temperature.

• It inhibits abscisic acid, promoting germination.

• It attracts pollinators.

• It provides energy for the seed.

What is a potential problem with sowing seeds too deep in the soil?

• The seeds may be eaten by animals.

• The seeds may not receive enough light.

• The seeds may not receive enough water.

• The seeds may dry out.

How does passing through an animal's digestive tract help a seed?

• It provides nutrients to the seed.

• It softens the hard seed coat.

• It increases the seed's size.

• It changes the seed's color.

Why is seed dispersal important for plant species survival?

• It ensures seeds are planted in nutrient-rich soil.

• It attracts more pollinators.

• It reduces competition among seedlings.

• It increases the seed's growth rate.

What role do digestive enzymes play in seed germination?

• They increase the seed's water absorption.

• They soften the seed's hard coat.

• They digest the seed's nutrients.

• They provide energy to the seed.

What happens to seeds that are not dispersed?

• They grow faster.

• They face increased competition for resources.

• They become more resistant to diseases.

• They produce more flowers.