Here are 10 things you must do in the CBSE Biology Exam

• The answer must be to the point and according to the mark given.
• Never forget to mention the question number.
• In case of subjective questions do give diagrams (even if it is not asked in the question).
• While making a diagram never forget to label it.
• Try to make all the labeling at any one side.
• Give more examples in your answer.
• Try to give the answers point-wise (in bullet points).
• Always underline any scientific name you mention.
• Start the genus name with capital letter and the species name with small letter. For example- Homo sapiens.
• In case of any physiological processes like photosynthesis or respiration, give the respective reactions.

Below are 4 strict dont's!

• Don’t write unnecessary lengthy answers.
• Never draw a diagram with a pen.
• Don’t try to make the diagram beautiful but try to make it scientifically correct.
• Do not give a diagram without labeling.

The thick fur insulates the body of the polar bear against the extreme cold of its arctic environment but polar bears actually have transparent, hollow hair called guard hair. These clear colored air filled guard hair help transmit heat from the sunlight to their black skin as a solar heat collector. Their guard hair are waterproof, so they also help keep the bear warmer when it is in water. Reflection of the sunlight from the transparent hair makes polar bears appear white, in the same way as reflection of the sunlight makes snow and ice look white. The dense fur completely hides the black skin underneath, which absorbs the heat energy from sunlight; plenty of light still passes through the transparent hair.