Q4 of 55 Page 1

How does a growing embryo get nutrition from the mother's blood?

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.


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2

The sky appears dark instead of blue to an astronaut. State its reason.

 3

Depletion of ozone in the ozone layer is a cause for our worry. Why?

 5

State the modem periodic law for classification of elements. How many (i) groups and (ii) periods are there in the modem periodic table?

 6

An element 'M' has atomic number 11:

(a) Write its electron configuration.


(b) State the group to which 'M' belongs?


(c) Is 'M' a metal or a non-metal?


(c) Write the formula of its chloride.