Which of the following has proved helpful in preserving pollens as fossils?

1. Pollen kit 2. Cellulosic intine
3. Oil content 4. Sporopollenin
Subtopic:  Stamen: Male Gametophyte |
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Pollen grains can be stored for several years in liquid nitrogen having a temperature of:

1. –120 °C 2. –80 °C
3. –196 °C 4. –160 °C
Subtopic:  Stamen: Male Gametophyte |
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Please attempt this question first.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology