NEET 2018 · BiologyPrevious Year Question
Which of the following has proved helpful in preserving pollen as fossils? (NEET 2018)
Answer: (D) (4) Sporopollenin. Answer: D.
- A.(1) Oil content
- B.(2) Cellulosic intine
- C.(3) Pollenkitt
- D.(4) Sporopollenin✓
Correct Answer
(D) (4) Sporopollenin
Solution & Explanation
Answer: D. Sporopollenin, the chemical of the exine, is one of the most resistant organic materials known — no enzyme degrades it — so pollen grains survive as fossils because of it. Intine (cellulose/pectin), oil content and pollenkitt do not confer this fossilising resistance. NCERT: Ch 1, p.7, lines 14-15 — "Pollen grains are well-preserved as fossils because of the presence of sporopollenin."
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