Questions

Can’t delete a row from primary table if there are related rows in secondary table.

Nucleus serves as the control center for cell metabolism and reproduction.

According to a Report by analyst firm Canalys, India has become the second largest smartphone market in the world.

Echolocation is an adaptation bats use to hunt insects in flight, locate flowering plants and find warm places for hibernation.

By trial and error method,

P=0, Q=9, R=0 satisfies the values.

Black  surfaces are good emitters of heat ( They are also good absorbers of heat). If the black surface is rough too, the emitting will be better. So (b) is the correct answer. Shining surfaces reflect back radiation. So if the black surface is also shining the effectiveness of emitting heat is lessened.