Q20 of 48 Page 1

Write the function of placenta in human females.

The embryo gets nourishment inside the mother’s body by a disc-like tissue placenta which gets developed between the uterus well and the embryo during the implantation. The nutrients, Oxygen and waste products are exchanged through this tissue.


More from this chapter

All 48 →
9

Alkanes generally burn with clean flame. Why?

 11

An element X (atomic number 17) reacts with an element Y (atomic number 20) to a compound.

(a) Write the position of these elements in the modern periodic table.


(b) Write the formula of the compound formed. Justify your answer in each case.


Justify your answer in each case.

 16

An object of height 5 cm is placed perpendicular to the principal axis of a concave lens of focal length 10 cm. Use lens formula to determine the position, size and nature of the image if the distance of the object from the lens is 20 cm.

 20

List four ways of preventing pregnancy. State two advantages of using such preventive methods.