Which among the following diseases is not sexually transmitted?

Which of the following statements are true for flowers?
$(i)$ Flowers are always bisexual
$(ii)$ They are the sexual reproductive organs
$(iii)$ They are produced in all groups of plants
$(iv)$ After fertilization they give rise to fruits

Which of the following two sex hormones are produced by the human female ovary?

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

In the process of reproduction as used in $Spirogyra$,the organism splits itself into small pieces.
$(a)$ What is this process of reproduction called?
$(b)$ Will this type of reproduction be asexual or sexual reproduction? Answer with reason.
$(c)$ Is this process same as regeneration? Give reasons.

Is the chromosome number of the zygote,embryonal cells,and adult of a particular organism always constant? How is the constancy maintained in these three stages?