Question

please answer the all following questions Q-6 to Q-12 pleasw

Answer 1

6.In Bryophyllum, the leaves bear leaf buds which originate along the leaf margins. The leaf buds gradually develop some roots called adventitious roots. When the leaves bearing these leaf buds fall down and the roots touch the soil, new and individual plants grow from the buds .But Roses have a different type of reproduction Called Grafting so Leaves of roses doesn't produce new plants when fallen on the ground .

7.After fertilization the lining of uterus thickens and is richly supplied with blood to nourish the growingembryo. The embryo gets nutrition from the mother's blood with he help of a special tissue called placenta. It is embedded in the uterine wall.

8.The thick and spongy lining of the uterus slowly breaks and comes out through the vagina as blood and mucus.

9.Ovary : Ovary is the primary sex organ in females which produces eggs.
.It also, secretes hormone such as estrogen (which imparts female secondary sexual characters) and progesterone (which maintains pregnancy).
.Ovary remains functional up to 50 years of ago

Testis : Testis is the primary sex organ in males which produces sperms.
.It also secretes hormone testosterone which imparts male secondary sexual characters.
.Testis remains functional even more than 70 years of age.

10.Planaria gets cut into many pieces, each piece grows into separate individual, specialized cells proliferate. Mass of cells gets differentiated into various cells and tissues.
Regeneration is not the same as reproduction as most of the organisms would not normally depend on being cut up to be able to reproduce.
(It is normally for repair of the damaged part).Figure Given In Photo

11.It is the only means of reproduction in specie's which are seedless or which usually do not produce viable seeds, such as banana, figs, pineapple, and chrysanthemum.

 It is rapid, easier and cheaper compared to production of plants by seeds.

Plants raised through vegetative propagation are exactly like the parent plant. Those form seeds show variations due to the fusion of two gametes (mixing of genetic characters) from different varieties. Thus, by vegetative propagation selected vareities of various plants can be maintained without losing their desirable characters.

Improved varieties of ornamental plants and fruit trees can be multiplied easily.

12.Fission is a type of asexual reproduction in which unicellular organism divides itself and produce two or more new individuals .they are of two type

binary Fission : Divides and forms two new individuals

Multiple Fission : Divides itself into many daughter cells

Ex : Amoeba (Binary Fission ) ,Plasmodium ( Multiple Fission)