Question

where are the following structures/parts located and what are their functions? a) placenta B) Thalamus c) stigma​

Answer 1

HERE IS UR ANSWER:-

A)PLACENTA IS LOCATED AT SIDE OF UTERUS.

B)THALAMUS IS LOCATED IN BRAIN.

C)STIGMA IS LOCATED AT CENTRE OF A FLOWER.

HOPE IT HELPED U!✌✌

Answer 2

 typical flower has 4 main parts:
Calyx: also called sepals. They are the outermost part of the flower. They protect the flower from injury during bud condition.
Corolla: also called petals. They are generally brightly coloured to attract insects for pollination.
Androecium: the male reproductive unit. They consist of:

Anther: sac like structure that contains pollen.

Filament: stalk that attach anther to the base of the flower.

Gynoecium: the female reproductive unit. Also called carpel. Each carpel has 3 parts:

Stigma: the knob like tip that receives pollen.

Style: long tube like structure that connects stigma and ovary.

Ovary: contains ovules. Each ovule contains the embryo sac, that contains the female gamete.



After fertilisation:
Calyx: wither away. Sometimes remanants of carpels can be found on fruits like chilli, tomato and other members of Solanaceae family.
Corolla and androecium: wither away.
Gynoecium: Stigma and style wither away. The ovary becomes fruit and the ovules inside the ovary become seeds.
Hope I helped.


Ovary changes to fruit.

Ovary wall changes to pericarp.

Ovule changes to seed.

Funicle changes to stalk of seed.

Nucellus changes to perisperm.

Outer integument changes to testa.

Inner integument changes to tegmen.

Emryo sac changes to endosperm and embryo.