MCQ
Choose the correct one


- ✓$A -$ Chorionic villi $\rightarrow$ forms placenta
- B$B$ - Yolk sac $\rightarrow$ Prevents desiccation of embryo
- C$C$ - umbilical cord $\rightarrow$ Haemopoiesis
- D$D -$ Blastocyst $\quad \rightarrow$ Forms the embryo

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$R$ - The salt concentration is $45 -50$ (parts per thousand) in the sea.
$I.$ People should get vaccination to avoid infection
$II.$ Vaccination is available against polio, cholera, typhoid, tuberculosis and many othe disease
$III.$ Eradication of vectors are necessary in diseases like malaria and filariasis
$IV. $ Dengue and chikengunya, both are spread by Culex mosquitoes
Which of the statements given above are correct?