Question

Give reason :
a. Angiosperms show the process of double fertilization.
b. Flowers in Salvia plants show stamens with lever mechanisms.

Answer 1

Answer:

ONE OF THE MALE GAMETE MOVES TOWARDS THE EGG CELL, FUSES WITH ITS NUCLEUS AND COMPLETES SYNGAMY. ZYGOTE IS FORMED.

THE 2ND MALE GAMETE MOVES TOWARDS THE CENTRAL CELL AND FUSES WITH THE 2 POLAR NUCLEI TO PRODUCE A TRIPLOID PRIMARY ENDOSPERM NUCLEUS (PEN).

SINCE THERE IS FUSION OF 3 HAPLOID NUCLEI IT IS CALLED TRIPLE FUSION.

AS 2 TYPES OF FUSION SUCH AS SYNGAMY AND TRIPLE FUSION TAKES PLACE IN AN EMBRYO SAC, THE PHENOMENON IS CALLED DOUBLE FERTILISATION