Question

types of seeds germination​

Answer 1

Answer:

There are two types of germination are:

1 Epigeal Germination: In this type of germination, the hypocotyl elongates rapidly and arches upwards pulling the cotyledons which move above the soil. ...

2 Hypogeal Germination: In this type of germination, the epicotyl elongates and the cotyledons remain below the soil.

Answer 2

Answer:

It is of two types.Epigeal and hypogeal.

Epigeal germination

In this type of germination, the cotyledons are brought above the ground due to rapid elongation of hypocotyl. Epigeal germination seen inmany dicotyledon seeds such as bean, castor, sunflower, gourd, cucumber etc., During this germination the hyphocotyl grows actively and become curved. It brings the seed above the soil. After coming above the surface of the soil, the hypocotyl straightens. The loosened seed coat fall down and the cotyledons become green. Now, the epicotyl grows and plumule gives rise to green leaves. The cotyledons fall down ultimately.

Hypogeal germination

In this type of germination, the cotyledons remain below the soil due to rapid elongation of epicotyl. It is found in many dicotyledonous seeds and monocotyledonous seeds. During this germination, the epicotyl elongates and become curved. It brings the plumule above the soil. Cotyledons remain underground. In case of monocotyledonous seeds like maize, the coleoptile (plumule covering) grows straight into the soil and comes out to form the green tube. Plumle elongates as well and comes out of the soil while contained in the coleoptile. the plumle ruptures the coleoptile with further growth. The coleorrhiza (covering of radicle) along with radicle grows downwards. After sometimes coleorrhiza ruptures due to further growth of the radicle. The radicle forms the primary root which is soon replaced by fibrous foot.