CBSE Class 12 Biology Boards 2021 Sample Paper Solved

SECTION A Questions Marks 1. Why does endosperm development precede embryo development?   2. How many meiotic divisions are required to produce 76 seeds in a Guava fruit?    3. How does pollination take place in water hyacinth and water lily?    4. Name the glands that…

CBSE Class 12 Biology Boards 2020 Sample Paper Solved

CBSE Class 12 Biology Boards 2020 Sample Paper Solved. CBSE has recently released the class 12 sample papers for subject Biology. These suggested sample papers are released every year by CBSE ahead of the class 12 board exams so that the students can understand the pattern of…

CBSE Class 12 Biology Sample Paper 2020 Solved Set B

CBSE Class 12 Biology Sample Paper 2020 Solved Set B. CBSE issues sample papers every year for students for Class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this…

CBSE Class 12 Biology Sample Paper 2020 Solved Set A

CBSE Class 12 Biology Sample Paper 2020 Solved Set A. CBSE issues sample papers every year for students for Class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this…

CBSE Class 12 Biology Sample Paper 2019 Solved Set A

CBSE Class 12 Biology Sample Paper 2019 Solved Set A. CBSE issues sample papers every year for students for Class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this…

CBSE Class 12 Biology Sample Paper 2019 Solved

CBSE Class 12 Biology Sample Paper 2019 Solved. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year.…

CBSE Class 12 Biology Sample Paper 2018 Set E

Section - A 1. A tissue culture experiment has been performed with a plant tissue infected with TMV. Meristematic tissue produces healthy plant. Reason out the possibility of obtaining such result. 1 2. State a method of cellular defence which works in all eukaryotic organisms…

CBSE Class 12 Biology Sample Paper 2018 Set D

SECTION – A Q.1 What is heterogamety? Give an example of an organism showing it. Q.2 What are the characteristic feature of a true breeding line. Q.3 State what happens when an alien gene is ligated at Sal I site of PBR 322 plasmid? Q.4 What is the host called that produces a…

CBSE Class 12 Biology Sample Paper 2018 Set C

SECTION -A Q.1. Name any one green house gas and its possible source of production on large scale. Q.2. One of the control measure employed by the government is applications of euro III norms. What does it stipulate? Q.3.  When a tall pea plant was self pollinated ¼ of the…

CBSE Class 12 Biology Sample Paper 2018 Set B

SECTION-A 1- Mention any two reasons why the primary varies in different types of ecosystems. 2- A boy has been diagnosed with ADA-deficiency. Suggest any one possible treatment. 3- In which two of the following organisms is the fertilization external? Bony fishes, ferns,…

CBSE Class 12 Biology Sample Paper 2018 Set A

SECTION-A 1- Name two animals that exhibit Oestrus cycle.  2-What is point mutation ? Give one example.  3- Mention one difference to distinguish an exon from an intron.  4- dSuggest a molecular diagnostic procedure that detects HIV in a suspected AIDS patient. 5-What does…

CBSE Class 12 Biology Sample Paper 2017 Set E

Section - A 1. A certain tissue, of a plant, infected with TMV was used to obtain a new plant using tissue culture technique. Identify the technique used and reason out the possibility of obtaining a new healthy plant.  2. State a method of cellular defense which works in all…

CBSE Class 12 Biology Sample Paper 2017 Set D

SECTION-A 1- Write the two specific codons that a translational unit of m RNA is flanked by one on either sides. 2- State the type of interaction that exists between ticks and dogs. 3- Write the chromosomal defect in individuals affected with Klinefelter’s syndrome. 4- …

CBSE Class 12 Biology Sample Paper 2017 Set C

SECTION-A 1- Write the two components of the first artificial recombinant DNA molecule constructed by Cohen and Boyer 2-Give the scientific name of the source organism from which the first antibiotic was produced. 3- Why do normal red blood cells became elongated sickle shaped…