- AAbsorption of CaCO3 from the digested food.
- BReabsorption of water from renal tubules.
- CIncreasing blood calcium levels.
- DMaintenance ion balance in blood.
Explanation:
This is called so because PTH stimulates the reabsorption of calcium by the renal tubules and increases calcium absorption from the digested food.
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Statements:
$A.$ On dry land it would die due to lack of O_2 if its mouth is forcibly kept closed for a few days.
$B.$ It has fourchambered heart.
$C.$ On dry land it turns uricotelic from ureotelic.
$D.$ Its lifehistory is carried out in pond water.
Assertion $A:$ In gymnosperms the pollen grains are released from the microsporangium and carried by air currents.
Reason $R$ : Air currents carry the pollen grains to the mouth of the archegonia where the male gametes are discharged and pollen tube is not formed.
In the light of the above statements, choose the correct answer from the options given below :