Question

Cotyledons are pushed upwards by the rapid elongation of the hypocotyls in

• A. Hypogeal germination
• B. Epigeal germination
• C. Synchronised germination
• D. Nocturnal germination

Hint:

Hypocotyl elongates $\rightarrow$ Epigeal (Cotyledons come up).
Epicotyl elongates $\rightarrow$ Hypogeal (Cotyledons stay down).
Remember "Epi" = "Exit" the soil.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
The question describes a type of seed germination based on whether the cotyledons (seed leaves) stay underground or are lifted above the soil surface.
Detailed Explanation:

• Epigeal Germination:
"Epi" means above and "Ge" means earth.
In this type, the hypocotyl (the part of the embryo axis below the cotyledons) elongates rapidly and arches upward.
This growth pulls the cotyledons out of the soil and into the air, where they often turn green and photosynthesize.
Common examples include Beans, Castor, and Sunflower.

• Hypogeal Germination:
"Hypo" means below.
In this type, the epicotyl (the part above the cotyledons) elongates. The cotyledons remain underground.
Common examples include Pea, Maize, and Gram.

Step 2: Final Answer:
The rapid elongation of the hypocotyl resulting in cotyledons being pushed above ground is characteristic of epigeal germination.