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The tropopause is the boundary in the Earth’s atmosphere between the troposphere and the stratosphere.

It is a thermodynamic gradient stratification layer, marking the end of the troposphere. It lies, on average, at 17 kilometres above equatorial regions, and above 9 kilometres over the polar regions.<br>

The stratopause is the level of the atmosphere which is the boundary between two layers: the stratosphere and the mesosphere. In the stratosphere, the temperature increases with altitude, and the stratopause is the region where a maximum in the temperature occurs.

The life cycle of Plasmodium has three stages.

First stage is the infection of a human with sporozoites.

Second stage is the Asexual production.

Third stage is the sexual production.

Part of the brain nearest to spinal cord is medulla oblongata

The part of the brain which controls involuntary actions – Medulla oblongata.

The chemical substances that regulate plant growth are called phytohormones.

The only plant hormone that exists in gaseous state is ethylene .

Liver is the largest metabolic organ in the human body. Weight is 1500gm.

Aluminium (Al) is a silver-white ,soft,nonmagnetic and ductile metal in the boron group having 13 as atomic number.

The time interval taken by a radioactive substance to disintegrate to half of its initial value is called half life.

In 1 month it will be 5000

In 2 months it will be 2500

In 3 months it will be 1250

The distance between centre of a lens and its focus is called focal length.

In water the distance increases and so the focal length increases .

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