Which is the most correct statement with...

Which is the most correct statement with reference to man?

Arteries always carry oxygenated blood while veins always carry deoxygenated blood.

Arteries are provided with valves while veins are devoid of valves.

Arteries always carry blood away from the heart, while veins always carry blood towards the heart.

Venous blood is returned to left auricle.

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Which one is the correct statement with reference to the solubility of MgSO_4 in water ?

`SO_4^(2-)` ions mainly contributes towards hydration energy

Sizes of `Mg^(2+)` and `SO_4^(2-)` are similar

Hydration energy of `MgSO_4` is higher in comparison to its lattice energy

Ionic potential (charge/ radius ratio) of `Mg^(2+)` is very low

Monogenetic , dimorphic ,pseudocoelomate and coelozoic parasite

Monogenetic , dimorphic, coelomate and histozoic parasite

Digenetic , dimorphic, pseudocoelmate and histozoic

Digmorphic , coelomate and histozoic parasite .

Hatching of embryos takes place in the stomach due to lytic enzyme

Adulthood is reached inside the body of the host in ten days time

Development and moulting takes place in the alveoli of lungs

Hatching of embryo takes places within ten hours