STD 11 - 17. Locomotion and movement — NEET STD 11 Science — Question

Assertion $(A)$:

Osteoporosis is characterised by decreased bone mass and increased chances of fractures.

Reason $(R)$ :

Common cause of osteoporosis is increased levels of estrogen.

In the light of the above statements, choose the most appropriate answer from the options given below:

$I$. It checks the mixing of oxygenated and deoxygenated blood in heart

$II$. It circulates only oxygenated blood through heart.

Choose the correct option accordingly

 $\begin{array}{|l|l|} \hline Column-I  & Column-II \\ \hline 1.\,\,Osculum & p.\,\,Fasciola \\ \hline 2.\,\,Hypostom  & q.\,\,Ctenoplana \\ \hline 3.\,\,Comb\,\,jellies & r.\,\,Spongilla \\ \hline 4.\,\,Hook\,\,and\,\,sucker & s.\,\,Meandrina \\ \hline \end{array}$