Which method of plant propagation is used to obtain high-quality mangoes from a common mango tree?

What should the temperature of the testes be relative to the body temperature for the production of sperm?

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

State the importance of chromosomal difference between sperms and eggs of humans.

$(a)$ Identify the asexual method of reproduction in each of the following organisms:
$(i)$ Rose
$(ii)$ Yeast
$(iii)$ Planaria
$(b)$ What is fragmentation? Name a multicellular organism which reproduces by this method.

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?