Question

Define these terms: [ Note: *Singular: (-ium); plural: (-ia)]

Haplodiplontic

Tracheid

Exant*

Sporangia*

Gametangia*

Archegonia*

Antheridia*

Strobili

Sporophyll

Answer 1

Haplodiplontic:It is an intermediate condition between haplontic and diplontic life cycle.They have multicellular diploid and haploid stages.

Tracheid:It is a water conductincting cell located in xylem.It is a nonliving cell.They have thick secondary cell walls.They are elongated cells in the xylem.

Exant:Still existing.Species living today are called exant species.

Sporangia:These are the capsule structures.They can produce spores through mitosis.Some are able to produce spores through mitosis.

Gametangia:They produce gametes.They are haploid structures.

Archegonia:They are female reproductive organs.They are haploid structures.They have flask shape with a long neck and swollen base.They produce female gametes.

Antheridia:They are male reproductive organs.They are haploid structures.They produce male gametes.

Strobili:These are tight arrangements of sporophylls around a central stalk.They are often called cones.

Sporophyll:These are leaf like appendages.It bears sporangia.Both microphylls and megaphylls can be sporophylls.