Module: | Pollination & Outbreeding Devices
Q55: Consider the following statements regarding exine sculpturing and palynology:
1. The intricate architectural patterns and designs on the pollen exine are highly species-specific and hold immense taxonomic value.
2. Sporopollenin degrades rapidly when exposed to strong alkaline soils, which severely limits the fossilization of pollen grains in such environments.
3. The scientific study of both living and fossilized pollen grains and spores is formally known as palynology.
Which of the above statements is/are correct?
2. Sporopollenin degrades rapidly when exposed to strong alkaline soils, which severely limits the fossilization of pollen grains in such environments.
3. The scientific study of both living and fossilized pollen grains and spores is formally known as palynology.
Which of the above statements is/are correct?
✅ Correct Answer: A
The correct option is A. Statements 1 and 3 are correct, whereas Statement 2 is fundamentally incorrect.
The exine, the outermost layer of a pollen grain, is not just a protective shell; it exhibits fascinating arrays of ridges, spikes, and reticulations (sculpturing). Because these structural patterns are genetically fixed and unique to each species, taxonomists heavily rely on them to classify plants and identify evolutionary relationships.
The study of these microscopic entities is termed palynology.
Statement 2 directly contradicts the biochemical properties of sporopollenin, the primary constituent of the exine.
Sporopollenin is one of the most chemically inert biological polymers known.
It is famously resistant to high temperatures, strong acids, and strong alkalis, and cannot be degraded by any known enzyme.
This exact causal resistance is why pollen is so perfectly preserved as fossils even in harsh alkaline sedimentary layers.
The exine, the outermost layer of a pollen grain, is not just a protective shell; it exhibits fascinating arrays of ridges, spikes, and reticulations (sculpturing). Because these structural patterns are genetically fixed and unique to each species, taxonomists heavily rely on them to classify plants and identify evolutionary relationships.
The study of these microscopic entities is termed palynology.
Statement 2 directly contradicts the biochemical properties of sporopollenin, the primary constituent of the exine.
Sporopollenin is one of the most chemically inert biological polymers known.
It is famously resistant to high temperatures, strong acids, and strong alkalis, and cannot be degraded by any known enzyme.
This exact causal resistance is why pollen is so perfectly preserved as fossils even in harsh alkaline sedimentary layers.