Q.56 Pseudoelators, which help in the dispersal of spores, are present in
1. Psilotum
2. Marchantia
3. Riccia
4. Anthoceros
Pseudoelators for Spore Dispersal in Bryophytes
Pseudoelators are specialized, multi-cellular sterile structures in certain bryophytes that assist in spore liberation through hygroscopic movements triggered by humidity changes. The correct answer to “Pseudoelators, which help in the dispersal of spores, are present in” is 4. Anthoceros.
Correct Answer: Anthoceros
Anthoceros (hornworts) features pseudoelaters in its sporophyte capsule alongside spores and a columella. These elongated, thin-walled cells split lengthwise upon maturity, change shape in response to moisture, and propel spores outward for dispersal.
Unlike true elaters (single-celled with spiral thickenings in liverworts), pseudoelaters are multicellular and lack thickenings but serve the same function.
Option Analysis
| Option | Plant Group | Explanation | Correct? |
|---|---|---|---|
| 1. Psilotum | Pteridophyte | Whisk ferns lack pseudoelaters; spore dispersal occurs via simple sporangia without elater-like structures. | No |
| 2. Marchantia | Liverwort | Contains true elaters (sterile, spiral-thickened cells) in capsules for spore dispersal, not pseudoelaters. | No |
| 3. Riccia | Liverwort | Lacks elaters or pseudoelaters; spores disperse directly from sunken capsules without assistive structures. | No |
| 4. Anthoceros | Hornwort | Bears pseudoelaters in sporangia that aid spore release through hygroscopic twisting and splitting. | Yes |
Role in Bryophyte Reproduction
Pseudoelators enhance spore dispersal in hornworts by responding to environmental humidity, ensuring spores reach suitable germination sites. This adaptation boosts reproductive success in non-vascular bryophytes, a key topic in plant kingdom studies for exams.
