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KCET2026BiologySexual Reproduction in Flowering Plants

Pollen grains are well preserved as fossils because of the presence of _____

Options

  1. ACellulose
  2. BSporopollenin
  3. CLignocellulose
  4. DPectocellulose

Correct answer

B. Sporopollenin

Step-by-step solution

Pollen grains have a hard outer layer called the exine, which is composed of sporopollenin. Sporopollenin is one of the most resistant organic materials known. It can withstand high temperatures, strong acids, and alkalis. No enzyme that degrades sporopollenin is known so far. Due to the presence of sporopollenin, pollen grains are well preserved as fossils. Answer: Sporopollenin

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