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  • (a) Mention the events that lead to the development of placenta during preganancy in human females. (b) Describe post - poillnation events leading to double - fertilization in angiosperms, starting with two - celled pollen grain.

(a) Mention the events that lead to the development of placenta during preganancy in human females.

(b) Describe post - poillnation events leading to double - fertilization in angiosperms, starting with two - celled pollen grain.

 

 

 

 
 
 
 
 

Answers (1)

a) After implantation, finger-like projections appear on the trophoblast called chorionic villi which are surrounded by the uterine tissue and maternal blood. The chorionic villi and uterine tissue become interdigitated with each other and jointly form a structural and functional unit between developing embryo (foetus) and maternal body called the placenta.

b) 1. The placenta facilitates the supply of oxygen and nutrients to the embryo and also removal of carbon dioxide and excretory/waste materials produced by the embryo.

2. The placenta is connected to the embryo through an umbilical cord which helps in the transport of substances to and from the embryo.

3. Placenta also acts as an endocrine tissue and produces several hormones like human chorionic gonadotropin (hCG)- human placental lactogen (hPL), estrogens, progestogens, etc.

Posted by

Priyanka Kumari

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