Which of the following has proved helpful in preserving pollen as fossils?
Pollenkitt
Cellulosic intine
Sporopollenin
Oil content
Pollen grains can be stored for several years in liquid nitrogen having a temperature of
–120°C
–80°C
–160°C
–196°C
After double fertilisation, a mature ovule has
I diploid and I haploid cell
1 diploid and I triploid cell
2 haploid and I triploid cell
1 haploid and I triploid cell
Double fertilization is
Fusion of two male gametes of a pollen tube with two different eggs
Fusion of one male gamete with two polar nuclei
Syngamy and triple fusion
Fusion of two male gametes with one egg