In human females,where does the implantation and development of the embryo occur?

Differentiate between the following:
$(a)$ Pollen tube and Style
$(b)$ Fission in Amoeba and Plasmodium
$(c)$ Fragmentation and Regeneration
$(d)$ Bud of Hydra and bud of Bryophyllum
$(e)$ Vegetative propagation and Spore formation.

Define the term 'double fertilization in plants'. After fertilization,name the part in each case which develops into $(i)$ the fruit,(ii) the seeds.

$A$ feature of reproduction that is common to $Amoeba$,$Spirogyra$ and $Yeast$ is that

List any two modes of asexual reproduction in animals. Under which mode of reproduction is vegetative propagation placed and why? List two advantages of vegetative propagation.

Write two points of difference between asexual and sexual types of reproduction. Describe why variations are observed in the offspring formed by sexual reproduction.