What is sporopollenin why it is resistant?

Sporopollenin is the most resistant known biological material which is found in the exine of the pollen grains. Sporopollenin is resistant to chemical and microbial decomposition. Thus, it can withstand high temperatures and strong acids and alkalies. Due to this, pollen grains are well preserved during fossilization.

Which is the most resistant organic material present in the exine?

NEET Question. Sporopollenin is present in exine of pollen grains in plants. It is one of the most resistant organic substances and can withstand high temperature, strong acids and alkali. No enzyme that degrades sporopollenin is so far known.

Which substance can degrade sporopollenin?

Sporopollenin can be degraded by enzymes.

What is the role of sporopollenin?

The outer wall or exine of pollen grains contains sporopollenin. It protects pollen grains from external factors such as temperature, acid, alkali, etc. Because of sporopollenin, pollen grains are preserved as fossils.

What is the nature of sporopollenin?

Sporopollenin is highly cross-linked polymer composed of carbon, hydrogen, and oxygen that is extraordinarily stable and has been found chemically intact in sedimentary rocks some 500 million years old.

What is sporopollenin made up of?

Is sporopollenin biodegradable?

These results demonstrate that even though the main sporopollenin component of the SDMCs is common to a range of plant species, the diversity in the quantity and chemistry of its functional groups significantly affect its biodegradability.

Is sporopollenin organic or inorganic?

Sporopollenin is made up of inorganic materials.

What is the use of sporopollenin?

Sporopollenin has found uses in the field of paleoclimatology as well. Sporopollenin is also found in the cell walls of several taxa of green alga, including Phycopeltis (an ulvophycean) and Chlorella. Spores are dispersed by many different environmental factors, such as wind, water or animals.

What is the importance of sporopollenin?

Its significance with reference to its chemical nature are as follows: It is one of the most resistant organic substance which can withstand high temperature, strong acids and alkali. No enzyme that degrades sporopollenin is so far known. This sporopollenin helps the pollen grain to be well preserved.

What are Ubisch bodies mention its function?

Note: The function of Ubisch bodies are not well specified. They form a transport system for the movement of sporopollenin between the developing microspores and tapetal cells. They also act as a lining for the anther sac from which the pollen grains are promptly confined or they may be related to pollen dispersal.

What is pro Ubisch bodies?

When the anther is young, at the stage of sporogenous tissue, the cells of the Tapetum possess numerous spherical bodies called pro-Ubisch bodies or pro-orbicules. The number of pro-Ubisch bodies increases when there is meiosis in pollen mother cells.

Where is sporopollenin synthesized and deposited?

Figure 2.5 shows the possible sites of sporopollenin synthesis, polymerization, and deposition of sporopollenin as suggested by Heslop-Harrison and Dickinson (1969). Sporopollenin is transported in a highly polymerized form from the tapetum to the exine.

Does encapsulated sporopollenin have a high bioavailability?

In vivo studies in humans have shown that an encapsulated active substance can have a substantially increased bioavailability than if it is taken alone. The sporopollenin exine surface possesses phenolic, alkane, alkene, ketone, lactone, and carboxylic acid groups.

How do you measure sporopollenin in spores?

The measurement of the amount of sporopollenin in spores and pollen is usually achieved by acetolyzing them and assuming that only exine is left. In general, the more sporopollenin, the more resistant to decay, oxidation, etc.

What is the sporopollenin-bearing wall of pollen?

In general it is limited to the outer wall, the exine however, fern spores and some gymnosperm pollen have an additional sporopollenin-bearing wall, the perine or perispore.