Q. 13.9( 35 Votes )
(i) DNA profiling or fingerprinting is the process of determining an individual's DNA characteristics, called a DNA profile, that is very likely to be different in unrelated individuals, thereby being as unique to individuals as are fingerprints.
It is used for the following purposes:
1. As a forensic technique in criminal investigation
2. To clarify paternity
3. To study plant and animal populations
(ii) Honeybees use the sun as a guide and are worldly-wise at navigation. They are said to have a sharp memory and a unique pattern of direction guidance i.e. dance. Their dance stipulates the distance and direction of the food source with respect to the direction of the sun.
(iii) Water rises in the form of vapours to form a dense cloud when the air is below the dew point. All the vapor in a cloud doesn’t condense in one go. These vapours condense slowly on dust particles present in the air. These dust particles combine to form a heavier particle. When these heavy particles start falling, they absorb more moisture and reach the ground as droplets.
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