NCERT Biology Textbook for Class XI

NCERT Biology Textbook for Class XI

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page, a detailed table of contents giving sub-headings within the chapter. Decimal system using arabic numerals has been employed to indicate these sub-headings. At the end of each chapter a brief summary is provided. This brings to the notice of the student, what she he is supposed to have learnt by studying the chapter. A set of questions is also provided at the conclusion of each chapter. These questions are essentially to enable the student to test herself himself as to how much she he has understood the subject matter. There are questions which are purely of information recall type there are questions which need analytical thinking to answer and hence test true understanding there are questions which are problems to solve and finally there are questions which need analysis and speculation as there is no one to answer to such questions. This tests the critical understanding of the subject matter in the mind of the student. Special emphasis has been given on the narrative style, illustrations, activity exercises, clarity of expression, coverage of topics within the available time in school. A large number of extremely talented and dedicated people including practising teachers helped in bringing out this beautiful book. Our main purpose was to make sure that school level biology is not a burden for students and teachers. We sincerely wish that teaching biology and learning biology would become an enjoyable activity.
Professor K. Muralidhar Department of Zoology University of Delhi
ed
CONTENTS FOREWORD FOR THE
TEACHERS
AND
STUDENTS
vii
o N be C ER re pu T bl is h
A NOTE
iii
UNIT I